2008 - MX-5 Service Highlights

Engine
Service Highlights - Engine
2008 - MX-5

Outline

ENGINE ABBREVIATIONS [LF]

ENGINE FEATURES [LF]
ENGINE SPECIFICATIONS [LF]

Outline

ENGINE SPECIFICATIONS [LF (Arab Gulf Cooperation Council)]

On-Board Diagnostics

ON-BOARD DIAGNOSTIC OUTLINE [LF]

ON-BOARD DIAGNOSTIC SYSTEM TEST MODE [LF]
DTC DETECTION LOGIC AND CONDITIONS [LF]
KOEO/KOER SELF-TEST [LF]
PID/DATA MONITOR AND RECORD [LF]
SIMULATION TEST [LF]

In-Take Air System

INTAKE-AIR SYSTEM OUTLINE [LF]

INTAKE-AIR SYSTEM STRUCTURAL VIEW [LF]
INTAKE-AIR SYSTEM DIAGRAM [LF]
INTAKE-AIR SYSTEM VACUUM HOSE ROUTING DIAGRAM [LF]
INTAKE MANIFOLD CONSTRUCTION [LF]
VARIABLE TUMBLE SYSTEM FUNCTION [LF]
VARIABLE TUMBLE SYSTEM STRUCTURE [LF]
VARIABLE TUMBLE SYSTEM OPERATION [LF]
VARIABLE TUMBLE SOLENOID VALVE FUNCTION [LF]
VARIABLE TUMBLE SOLENOID VALVE CONSTRUCTION/OPERATION [LF]
VARIABLE TUMBLE SHUTTER VALVE ACTUATOR FUNCTION [LF]
VARIABLE TUMBLE SHUTTER VALVE ACTUATOR CONSTRUCTION/OPERATION [LF]

Control System

ENGINE CONTROL SYSTEM OUTLINE [LF]

ENGINE CONTROL SYSTEM STRUCTURAL VIEW [LF]
ENGINE CONTROL SYSTEM DIAGRAM [LF]
ENGINE CONTROL SYSTEM WIRING DIAGRAM [LF]
ENGINE CONTROL SYSTEM BLOCK DIAGRAM [LF]
ENGINE CONTROL SYSTEM RELATION CHART [LF]
VARIABLE TUMBLE CONTROL OUTLINE [LF]
VARIABLE TUMBLE CONTROL BLOCK DIAGRAM [LF]
VARIABLE TUMBLE CONTROL OPERATION [LF]
PCM FUNCTION [LF]
VARIABLE TUMBLE SHUTTER VALVE SWITCH FUNCTION [LF]
VARIABLE TUMBLE SHUTTER VALVE SWITCH CONSTRUCTION/OPERATION [LF]
 Next >

2008 - MX-5 - Engine

ENGINE ABBREVIATIONS [LF]

ABDC After Bottom Dead Center

ABS Antilock Brake System

AT Automatic Transmission

ATDC After Top Dead Center

BBDC Before Bottom Dead Center

BTDC Before Top Dead Center

CAN Controller Area Network

CCM Comprehensive Component Monitor

CM Control Module

DC Drive Cycle

DSC Dynamic Stability Control

EX Exhaust

HU Hydraulic Unit

IN Intake

KOEO Key On Engine Off

KOER Key On Engine Running

MT Manual Transmission
PID Parameter Identification

RAM Random Access Memory

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2008 - MX-5 - Engine

ENGINE FEATURES [LF]

On-board Diagnostic

To meet OBD-II regulations Diagnostic monitoring system test results changed

Improved serviceability DTC changed

PID/DATA monitor function changed

Simulation test function changed

Intake-air System

Improved emission gas purification Variable tumble system adopted (AT)

Control System

Improved emission gas purification Variable tumble control adopted (AT)

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2008 - MX-5 - Engine

ENGINE SPECIFICATIONS [LF]

Specification

Specification

Item 2008MY 2007MY

LF (2.0L) LF (2.0L)

MECHANICAL

DOHC-16 valves in-line, 4-

Type ←
cylinder

Combustion chamber Pentroof ←

1,999
Displacement (ml {cc, cu in}) ←
{1,999, 122.0}

87.5 × 83.1
Bore × stroke (mm {in}) ←
{3.44 ×3.27}

Compression ratio 10:8 ←

1,720
Compression pressure (kPa {kgf/cm 2, psi} [rpm]) ←
{17.54, 249.5} [300]

Open BTDC (°) 0—30 ←

IN
Close ABDC (°) 32—62 ←
Valve timing
Open BBDC (°) 42 ←
EX
 Close ATDC (°) 5 ←

0.22—0.28 {0.0087—0.011}
IN ←
[Engine cold]
Valve clearance (mm {in})
0.27—0.33 {0.0107—0.0129}
EX ←
[Engine cold]

LUBRICATION SYSTEM

Type Force-fed type ←

337—591 {3.44—6.03, 49.0—

Oil pressure (reference value)
(kPa {kgf/cm 2, 85.8} ←
[oil temperature: 100°C {212°F}] psi} [rpm])
[3,000]

Type Trochoid gear type ←

Oil pump Relief valve

opening pressure (kPa {kgf/cm 2, 420—520 {4.28—5.30, 60.9— ←
psi} 75.4}
(reference value)

Type Full-flow, paper element ←

Oil filter
(kPa {kgf/cm 2, 80—120 {0.82—1.22, 11.6—
Bypass pressure ←
psi}) 17.4}

4.6 {4.9,
Total (dry (L {US qt, lmp 4.0}*1
4.75 {5.02, 4.18}
engine) qt})
4.75 {5.02,
4.18}*2

3.9 {4.1,
Engine oil capacity (approx. (L {US qt, lmp 3.4}*1
Oil replacement 4.05 {4.28, 3.56}
quantity) (AT, 5MT) qt})
4.05 {4.28,
3.56}*2

4.3 {4.5,
Oil and oil filter (L {US qt, lmp 3.8}*1
4.45 {4.70, 3.92}
replacement qt})
4.45 {4.70,
3.92}*2

Total (dry (L {US qt, lmp

4.85 {5.12, 4.27} ←
engine) qt})
Engine oil capacity (approx. (L {US qt, lmp
Oil replacement 4.05 {4.28, 3.56} ←
quantity) (6MT) qt})

Oil and oil filter (L {US qt, lmp

4.55 {4.81, 4.00} ←
replacement qt})

COOLING SYSTEM

Type Water-cooled, Electromotive ←

(L {US qt, lmp

Coolant capacity (approx. quantity) 7.5 {7.9, 6.6} ←
qt})

Centrifugal, V-ribbed belt-

Water pump Type ←
driven

Type Wax, bottom-bypass ←

Opening
(°C {°F}) 80—84 {176—183} ←
temperature
Thermostat
Full-open temperature (°C {°F}) 97 {207} ←

(mm
Full-open lift 8.0 {0.31} or more ←
{in})

Radiator Type Corrugated fin ←

Cap valve (kPa {kgf/cm 2, 93.2—122.6 {0.95—1.25,

Cooling system cap ←
opening pressure psi}) 13.5—17.8}

Type Electric ←

Number of blades 5 ←
Cooling fan
Outer diameter (mm {in}) 360 {14.2} ←

Fan motor output (W) 120 ←

FUEL SYSTEM

Type Hi-ohmic ←

Injector Type of fuel delivery Top-feed ←

 Type of drive Voltage ←

(kPa {kgf/cm 2,
Pressure regulator control pressure Approx. 390 {3.98, 56.6} ←
psi})

Fuel pump type Electric ←

(L {US gal, lmp

Fuel tank capacity 48 {12, 10} ←
gal})

Premium unleaded fuel

Fuel type (Anti-knock index) ←
91 [(R+M)/2 method] or
adove (96 RON or more)

EMISSION SYSTEM

EGR type Stepping motor ←

WU-TWC (monolith), TWC

Catalyst form ←
(monolith)

Evaporative emission (EVAP) control system Charcoal canister type ←

Positive crankcase ventilation (PCV) system Closed type ←

CHARGING SYSTEM

Voltage (V) 12 ←

Battery Type and capacity

(A·h) 46B24L (36) ←
(5-hour rate)

Output (V-A) 12-100 ←

Generator Regulated voltage ←

Controlled by PCM
Self diagnosis function ←

IGNITION SYSTEM

SEI (Single Electronic

Type ←
Ignition)

Spark advance Electronic ←

 1—3—4—2 (all cylinders
←
independent firing)

Ignition system

Firing order

Spark plug Type L3G2 18 110, L3Y1 18 110 ←

STARTING SYSTEM

Type Coaxial reduction ←

Starter
Output (kW) 1.4 ←

*1

Applied VIN (Assumed)

JM1 NC15F*7# 100001—130613

JM1 NC16F*7# 100001—130613

JM1 NC25F*7# 100001—130613

JM1 NC26F*7# 100001—130613

*2

Applied VIN (Assumed)

JM1 NC15F*7# 130614—

JM1 NC16F*7# 130614—

JM1 NC25F*7# 130614—

JM1 NC26F*7# 130614—

Engine oil specification

U.S.A. and
Item Except U.S.A. and CANADA
CANADA
Engine oil
grade

API SM or ILSAC

Engine oil 5W–20 (If SAE 5W-20 engine oil is not available in your market, use SAE
5W–20
viscosity 5W-30 engine oil.)

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2008 - MX-5 - Engine

ENGINE SPECIFICATIONS [LF (Arab Gulf Cooperation Council)]

Specification

Specification

Item 2008MY 2007MY

LF (2.0L) LF (2.0L)

MECHANICAL

DOHC-16 valves in-line, 4-

Type ←
cylinder

Combustion chamber Pentroof ←

1,999
Displacement (ml {cc, cu in}) ←
{1,999, 122.0}

87.5 × 83.1
Bore × stroke (mm {in}) ←
{3.44 ×3.27}

Compression ratio 10:8 ←

1,720
Compression pressure (kPa {kgf/cm 2, psi} [rpm]) ←
{17.54, 249.5} [300]

Open BTDC (°) 0—30 ←

IN
Close ABDC (°) 32—62 ←
Valve timing
Open BBDC (°) 42 ←
EX
 Close ATDC (°) 5 ←

0.22—0.28 {0.0087—0.011}
IN ←
[Engine cold]
Valve clearance (mm {in})
0.27—0.33 {0.0107—0.0129}
EX ←
[Engine cold]

LUBRICATION SYSTEM

Type Force-fed type ←

337—591 {3.44—6.03, 49.0—

Oil pressure (reference value)
(kPa {kgf/cm 2, 85.8} ←
[oil temperature: 100°C {212°F}] psi} [rpm])
[3,000]

Type Trochoid gear type ←

Oil pump Relief valve

opening pressure (kPa {kgf/cm 2, 420—520 {4.28—5.30, 60.9— ←
psi} 75.4}
(reference value)

Type Full-flow, paper element ←

Oil filter
(kPa {kgf/cm 2, 80—120 {0.82—1.22, 11.6—
Bypass pressure ←
psi}) 17.4}

4.6 {4.9,
Total (dry (L {US qt, lmp 4.0}*1
4.75 {5.02, 4.18}
engine) qt})
4.75 {5.02,
4.18}*2

3.9 {4.1,
Engine oil capacity (approx. (L {US qt, lmp 3.4}*1
Oil replacement 4.05 {4.28, 3.56}
quantity) (AT, 5MT) qt})
4.05 {4.28,
3.56}*2

4.3 {4.5,
Oil and oil filter (L {US qt, lmp 3.8}*1
4.45 {4.70, 3.92}
replacement qt})
4.45 {4.70,
3.92}*2

Total (dry (L {US qt, lmp

4.85 {5.12, 4.27} ←
engine) qt})
Engine oil capacity (approx. (L {US qt, lmp
Oil replacement 4.05 {4.28, 3.56} ←
quantity) (6MT) qt})

Oil and oil filter (L {US qt, lmp

4.55 {4.81, 4.00} ←
replacement qt})

COOLING SYSTEM

Type Water-cooled, Electromotive ←

(L {US qt, lmp

Coolant capacity (approx. quantity) 7.5 {7.9, 6.6} ←
qt})

Centrifugal, V-ribbed belt-

Water pump Type ←
driven

Type Wax, bottom-bypass ←

Opening
(°C {°F}) 80—84 {176—183} ←
temperature
Thermostat
Full-open temperature (°C {°F}) 97 {207} ←

(mm
Full-open lift 8.0 {0.31} or more ←
{in})

Radiator Type Corrugated fin ←

Cap valve (kPa {kgf/cm 2, 93.2—122.6 {0.95—1.25,

Cooling system cap ←
opening pressure psi}) 13.5—17.8}

Type Electric ←

Number of blades 5 ←
Cooling fan
Outer diameter (mm {in}) 360 {14.2} ←

Fan motor output (W) 120 ←

FUEL SYSTEM

Type Hi-ohmic ←

Injector Type of fuel delivery Top-feed ←

 Type of drive Voltage ←

(kPa {kgf/cm 2,
Pressure regulator control pressure Approx. 390 {3.98, 56.6} ←
psi})

Fuel pump type Electric ←

(L {US gal, lmp

Fuel tank capacity 48 {12, 10} ←
gal})

Premium unleaded fuel

Fuel type (Anti-knock index) ←
91 [(R+M)/2 method] or
adove (96 RON or more)

EMISSION SYSTEM

EGR type Stepping motor ←

WU-TWC (monolith), TWC

Catalyst form ←
(monolith)

Evaporative emission (EVAP) control system Charcoal canister type ←

Positive crankcase ventilation (PCV) system Closed type ←

CHARGING SYSTEM

Voltage (V) 12 ←

Battery Type and capacity

(A·h) 46B24L (36) ←
(5-hour rate)

Output (V-A) 12-100 ←

Generator Regulated voltage ←

Controlled by PCM
Self diagnosis function ←

IGNITION SYSTEM

SEI (Single Electronic

Type ←
Ignition)

Spark advance Electronic ←

 1—3—4—2 (all cylinders
←
independent firing)

Ignition system

Firing order

Spark plug Type L3G2 18 110, L3Y1 18 110 ←

STARTING SYSTEM

Type Coaxial reduction ←

Starter
Output (kW) 1.4 ←

*1

Applied VIN (Assumed)

JM1 NC15F*7# 100001—130613

JM1 NC16F*7# 100001—130613

JM1 NC25F*7# 100001—130613

JM1 NC26F*7# 100001—130613

*2

Applied VIN (Assumed)

JM1 NC15F*7# 130614—

JM1 NC16F*7# 130614—

JM1 NC25F*7# 130614—

JM1 NC26F*7# 130614—

Engine oil specification

Item Specifications

Engine oil grade API SG/SH/SJ/SL/SM or ILSAC GF–2/GF–3/GF–4

Engine oil viscosity 30, 40, 5W–30, 10W–30, 10W–40, 10W–50, 15W–40, 15W–50, 20W–40, 20W–50

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2008 - MX-5 - Engine

ON-BOARD DIAGNOSTIC OUTLINE [LF]

Features

To meet OBD-II regulations Diagnostic monitoring system test results changed

Improved serviceability DTC changed

PID/DATA monitor function changed

Simulation test function changed

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2008 - MX-5 - Engine

ON-BOARD DIAGNOSTIC SYSTEM TEST MODE [LF]

Sending Emission-related Malfunction Code

The DTCs are shown below.

×: ApplicableN/A: Not applicable

DTC No. Self-

Memory
Condition MIL DC Monitor item test
function
2008MY 2007MY type*3

B1342 ← PCM malfunction OFF N/A N/A C, O N/A

P0011 ← CMP timing over-advanced ON 1 CCM C, R ×

P0012 ← CMP timing over-retarded ON 2 CCM C, R ×

P0016 ← CKP-CMP correlation ON 2 CCM C ×

Front HO2S heater control circuit

P0030 ← ON 2 HO2S heater C, O, R ×
problem

P0031 ← Front HO2S heater circuit low input ON 2 HO2S heater C, O, R ×

P0032 ← Front HO2S heater circuit high input ON 2 HO2S heater C, O, R ×

P0037 ← Rear HO2S heater circuit low input ON 2 HO2S heater C, O, R ×

P0038 ← Rear HO2S heater circuit high input ON 2 HO2S heater C, O, R ×

Manifold absolute
P0069 ← pressure/atmospheric pressure ON 2 CCM C ×
correlation

MAF sensor circuit range/performance

P0101 ← ON 2 CCM C ×
problem
P0102 ← MAF sensor circuit low input ON 1 CCM C, O, R ×

P0103 ← MAF sensor circuit high input ON 1 CCM C, O, R ×

P0107 ← MAP sensor circuit low input ON 1 CCM C, O, R ×

P0108 ← MAP sensor circuit high input ON 1 CCM C, O, R ×

IAT sensor circuit range/performance

P0111 ← ON 2 CCM C ×
problem

P0112 ← IAT sensor circuit low input ON 1 CCM C, O, R ×

P0113 ← IAT sensor circuit high input ON 1 CCM C, O, R ×

Engine coolant temperature circuit

P0116 ← ON 1 Engine cooling system C ×
range/performance

P0117 ← ECT sensor circuit low input ON 1 Engine cooling system C, O, R ×

P0118 ← ECT sensor circuit high input ON 1 Engine cooling system C, O, R ×

P0122 ← TP sensor No.1 circuit low input ON 1 CCM C, O, R ×

P0123 ← TP sensor No.1 circuit high input ON 1 CCM C, O, R ×

Excessive time to enter closed loop

P0125 ← ON 2 Engine cooling system C ×
fuel control

P0126 ← ON 2 Engine cooling system C ×

Coolant thermostat stuck open
P0128 ← ON 2 Engine cooling system C ×

P0130 ← Front HO2S circuit problem ON 2 HO2S C, O, R ×

P0131 ← Front HO2S circuit low input ON 2 HO2S C, O, R ×

P0132 ← Front HO2S circuit high input ON 2 HO2S C, O, R ×

P0133 ← Front HO2S circuit problem ON 2 HO2S C ×

P0134 ← Front HO2S no activity detected ON 2 HO2S C, R ×

P0137 ← Rear HO2S circuit low input ON 2 HO2S C, O, R ×

P0138 ← Rear HO2S circuit high input ON 2 HO2S C, O, R ×

P0139 ← Rear HO2S circuit problem ON 2 HO2S C ×

P0140 ← Rear HO2S no activity detected ON 2 HO2S C, R ×

P0222 ← TP sensor No.2 circuit low input ON 1 CCM C, O, R ×

P0223 ← TP sensor No.2 circuit high input ON 1 CCM C, O, R ×

1
P0300 ← Random misfire detected Flash/ON or Misfire C, R ×
2

1
P0301 ← Cylinder No.1 misfire detected Flash/ON or Misfire C, R ×
2

1
P0302 ← Cylinder No.2 misfire detected Flash/ON or Misfire C, R ×
2

1
P0303 ← Cylinder No.3 misfire detected Flash/ON or Misfire C, R ×
2

1
P0304 ← Cylinder No.4 misfire detected Flash/ON or Misfire C, R ×
2

P0327 ← KS circuit low input ON 1 CCM C, O, R ×

P0328 ← KS circuit high input ON 1 CCM C, O, R ×

P0335 ← CKP sensor circuit problem ON 1 CCM C ×

P0340 ← CMP sensor circuit problem ON 1 CCM C ×

P0401 ← EGR flow insufficient detected ON 2 EGR system C, R ×

EGR valve (stepping motor) circuit

P0403 ← ON 2 CCM C, O, R ×
problem

Warm up catalyst system efficiency

P0421 ← ON 2 Catalyst C ×
below threshold

Evaporative emission control system

P0441 ← ON 2 Evaporative system C, R ×
incorrect purge flow

Evaporative emission control system

P0442 ← ON 2 Evaporative system C, R ×
leak detected (small leak)

P0443 ← Purge solenoid valve circuit problem ON 2 CCM C, O, R ×

Change over valve (COV) (EVAP

P0446 ← system leak detection pump) stuck ON 2 CCM C, R ×
close

Evaporative emission control system

P0455 ← ON 2 Evaporative system C, R ×
leak detected (gross leak)

Evaporative emission control system

P0456 *1 ← ON 2 Evaporative system C, R ×
leak detected (very small leak)

Fuel gauge sender unit

P0461 ← ON 2 CCM C ×
range/performance problem

Fuel gauge sender unit circuit low

P0462 ← ON 2 CCM C, O, R ×
input

Fuel gauge sender unit circuit high

P0463 ← ON 2 CCM C, O, R ×
input

Cooling fan relay No.1 control circuit

P0480 ← OFF 1 Other C, O, R ×
malfunction

Cooling fan relay No.2 control circuit

P0481 ← OFF 1 Other C, O, R ×
malfunction

Cooling fan relay No.3 control circuit

P0482 ← OFF 1 Other C, O, R ×
malfunction

P0500 *4 ← VSS circuit problem ON 2 CCM C ×

P0505 ← Idle speed control system problem OFF N/A N/A R N/A

Idle speed control system RPM lower

P0506 ← ON 2 CCM C ×
than expected

Idle speed control system RPM higher

P0507 ← ON 2 CCM C ×
than expected

Cold start emission

Cold start idle air control system
P050A ← ON 2 reduction strategy C, R ×
 performance
monitoring

Cold start emission

P050B ← Cold start ignition timing performance ON 2 reduction strategy C, R ×
monitoring

P0550 ← PSP switch circuit malfunction ON 2 CCM C ×

Cruise control switch circuit

P0564 ← OFF 1 Other C ×
malfunction

P0571 ← Brake switch circuit problem OFF 1 Other C ×

P0601 ← PCM memory check sum error ON 1 CCM C, O, R ×

P0602 ← PCM programming error ON 1 CCM C, O, R ×

PCM random access memory (RAM)

P0604 ← ON 1 CCM C, O, R ×
error

P0606 ← PCM processor ON 1 CCM C, O, R ×

P0610 ← PCM vehicle options error ON 1 CCM C, O, R ×

Throttle actuator control circuit

P0638 ← ON 1 CCM C ×
range/performance problem

Variable intake air solenoid valve

P0661 ← OFF 1 Other C, O, R ×
circuit low input

Variable intake air solenoid valve

P0662 ← OFF 1 Other C, O, R ×
circuit high input

P0703 ← Brake switch input circuit problem ON 2 CCM C ×

Clutch pedal position (CPP) switch

P0704 *2 ← ON 2 CCM C ×
input circuit problem

P0850 *2 ← Neutral switch input circuit problem ON 2 CCM C ×

P1260 ← Immobilizer system problem OFF 1 Other C, O N/A

Variable tumble shutter valve stuck

P2004 *5 N/A ON 2 CCM C, R ×
open

Variable tumble shutter valve stuck

P2006 *5 N/A ON 2 CCM C, R ×
closed

Variable tumble solenoid valve circuit

P2009 *5 N/A ON 2 CCM C, O, R ×
low input

Variable tumble solenoid valve circuit

P2010 *5 N/A ON 2 CCM C, O, R ×
high input

P2088 ← Oil control valve (OCV) circuit low ON 1 CCM C, O, R ×

P2089 ← Oil control valve (OCV) circuit high ON 1 CCM C, O, R ×

P2096 ← Target A/F feedback system too lean ON 2 Fuel system C ×

P2097 ← Target A/F feedback system too rich ON 2 Fuel system C ×

Throttle actuator circuit

P2101 ← ON 1 CCM C, R ×
range/performance

Throttle actuator control module

P2107 ← ON 1 CCM C, R ×
processor error

Throttle actuator control module

P2108 ← ON 1 CCM C, R ×
performance error

TP sensor minimum stop

P2109 ← ON 1 CCM C, R ×
range/performance problem

Throttle actuator control system

P2112 ← ON 1 CCM C, R ×
range/performance problem

Throttle actuator control throttle body

P2119 ← ON 2 CCM C, R ×
range/performance problem

P2122 ← APP sensor No.1 circuit low input ON 1 CCM C, O, R ×

P2123 ← APP sensor No.1 circuit high input ON 1 CCM C, O, R ×

P2127 ← APP sensor No.2 circuit low input ON 1 CCM C, O, R ×

P2128 ← APP sensor No.2 circuit high input ON 1 CCM C, O, R ×

TP sensor No.1/No.2 voltage

P2135 ← ON 1 CCM C, O, R ×
correlation problem

APP sensor No.1/No.2 voltage

P2138 ← ON 1 CCM C, O, R ×
correlation problem

P2177 ← Fuel system too lean at off idle ON 2 Fuel system C, R ×

P2178 ← Fuel system too rich at off idle ON 2 Fuel system C, R ×

P2187 ← Fuel system too lean at idle ON 2 Fuel system C, R ×

P2188 ← Fuel system too rich at idle ON 2 Fuel system C, R ×

P2195 ← Front HO2S signal stuck lean ON 2 HO2S C ×

P2196 ← Front HO2S signal stuck rich ON 2 HO2S C ×

P2228 ← BARO sensor circuit low input ON 1 CCM C, O, R ×

P2229 ← BARO sensor circuit high input ON 1 CCM C, O, R ×

EVAP system leak detection pump

P2401 ← ON 2 CCM C, R ×
motor circuit low

EVAP system leak detection pump

P2402 ← ON 2 CCM C, R ×
motor circuit high

EVAP system leak detection pump

P2404 ← ON 2 CCM C, R ×
sense circuit problem

EVAP system leak detection pump

P2405 ← ON 2 CCM C, R ×
sense circuit low input

EVAP system leak detection pump

P2407 ← ON 2 CCM C, R ×
sense circuit intermittent

P2502 ← Charging system voltage problem OFF 1 Other C, R ×

P2503 ← Charging system voltage low OFF 1 Other C, R ×

P2504 ← Charging system voltage high OFF 1 Other C, R ×

P2507 ← PCM B+ voltage low ON 1 CCM C, O, R ×

PCM internal engine off timer

P2610 ← ON 2 CCM C ×
performance
*1
California emission regulation applicable model
*2
MT
*3
C: CMDTC self-test, O: KOEO self-test, R: KOER self-test
*4
With ABS/DSC or MT without ABS/DSC
*5
AT

Sending Intermittent Monitoring System Test Results

The items supported by the sending intermittent monitoring system are shown below.

N/A: Not applicable

2008MY 2007MY
Related
Description
OBD Monitor Test OBD Monitor Test system
ID ID ID ID

01 80 ← HO2S (Front) lean-to-rich response time (calculated)

01 81 ← HO2S (Front) rich-to-lean response time (calculated)

01 82 ← HO2S (Front) lean-to-rich response time (calculated)

01 83 ← HO2S (Front) rich-to-lean response time (calculated)

HO2S
Low HO2S (Rear) voltage for switch time calculation
02 03 ←
(constant)

High HO2S (Rear) voltage for switch time calculation

02 04 ←
(constant)

02 05 ← HO2S (Rear) rich-to-lean response time (calculated)

21 80 ← HO2S (Front) and HO2S (Rear) switching time ratio Catalyst

31 83 ← EGR pressure variation EGR

3A 80 ← EVAP system leak detection pump large leak check

3B 80 ← EVAP system leak detection pump small leak check

EVAP
 EVAP system leak detection pump very small leak
3C 80*1 ←
check

3D 80 ← Purge flow monitor

A2 0B ← Cylinder No.1 average misfire counts for last 10 DC

A2 0C ← Cylinder No.1 misfire counts for last/current DC

A3 0B ← Cylinder No.2 average misfire counts for last 10 DC

A3 0C ← Cylinder No.2 misfire counts for last/current DC

Misfire
A4 0B ← Cylinder No.3 average misfire counts for last 10 DC

A4 0C ← Cylinder No.3 misfire counts for last/current DC

A5 0B ← Cylinder No.4 average misfire counts for last 10 DC

A5 0C ← Cylinder No.4 misfire counts for last/current DC

N/A E1 80 Heat radiation ratio

Thermostat
N/A E1 81 Engine coolant temperature

*1

California emission regulation applicable model

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2008 - MX-5 - Engine

DTC DETECTION LOGIC AND CONDITIONS [LF]

The detection condition of the following DTC has been changed from 2007MY.

P2004 Variable tumble shutter valve stuck open

PCM monitors variable tumble shutter valve position using variable tumble shutter valve
switch. If PCM turns the variable tumble solenoid valve on but variable tumble shutter
valve position still remain open (variable tumble shutter valve switch off), PCM determines
that variable tumble shutter valve has been stuck open.

P2006 Variable tumble shutter valve stuck closed

PCM monitors variable tumble shutter valve position using variable tumble shutter valve
switch. If variable tumble turns variable tumble solenoid valve off but variable tumble
shutter valve position still remain close (variable tumble shutter valve position sensor on),
PCM determines that variable tumble shutter valve has been stuck closed.

P2009 Variable tumble solenoid valve circuit low input

The PCM monitors variable tumble solenoid valve control signal. If the PCM turns variable
tumble solenoid valve off but voltage still remains low, the PCM determines that variable
tumble solenoid valve circuit has a malfunction.

P2010 Variable tumble solenoid valve circuit high input

The PCM monitors the variable tumble solenoid valve control signal. If the PCM turns
variable tumble solenoid valve on but the voltage still remains high, the PCM determines
that the variable tumble solenoid valve circuit has a malfunction.

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2008 - MX-5 - Engine

KOEO/KOER SELF-TEST [LF]

The self-test function consists of the KOEO (Key On Engine Off) self-test, performed when
the ignition switch is turned to the ON position and the engine is stopped; and the KOER
(Key On Engine Running) self-test, performed when idling. If a malfunction is detected
when either self-test is executed, a DTC is displayed on the Mazda Modular Diagnostic
System (M-MDS). Using the self-test function, the present malfunction or a successful
repair is readily confirmed. Refer to the self-test function table for the corresponding
DTCs.

KOEO (Key ON, Engine Off) Self-test

The KOEO self-test is a powertrain control system self-diagnosis, performed when the
ignition switch is turned to the ON position and the engine is stopped. A KOEO self-test
begins when the connected Mazda Modular Diagnostic System (M-MDS) sends an execute
command to the PCM.

As the KOEO self-test is performed, the PCM performs the inspection for set DTCs and if a
malfunction is detected the DTC is displayed on the Mazda Modular Diagnostic System (M-
MDS).

KOER (Key ON, Engine Running) Self-test

The KOER self-test is a powertrain control system self-diagnosis, performed when the
ignition switch is turned to the ON position and the engine is idling. A KOER self-test
begins when the connected Mazda Modular Diagnostic System (M-MDS) sends an execute
command to the PCM.

As the KOER self-test is performed, the PCM performs the inspection for set DTCs and if a
malfunction is detected the DTC is displayed on the Mazda Modular Diagnostic System (M-
MDS).

KOEO/KOER self-test table×: ApplicableN/A: Not applicable

DTC No. Test condition

Condition
2008MY 2007MY KOEO KOER

B1342 ← PCM malfunction × N/A

P0011 ← CMP timing over-advanced N/A ×

P0012 ← CMP timing over-retarded N/A ×

P0016 ← CKP-CMP correlation N/A N/A

P0030 ← Front HO2S heater control circuit problem × ×

P0031 ← Front HO2S heater circuit low input × ×

P0032 ← Front HO2S heater circuit high input × ×

P0037 ← Rear HO2S heater circuit low input × ×

P0038 ← Rear HO2S heater circuit high input × ×

P0069 ← Manifold absolute pressure/atmospheric pressure correlation N/A N/A

P0101 ← MAF sensor circuit range/performance problem N/A N/A

P0102 ← MAF sensor circuit low input × ×

P0103 ← MAF sensor circuit high input × ×

P0107 ← MAP sensor circuit low input × ×

P0108 ← MAP sensor circuit high input × ×

P0111 ← IAT sensor circuit range/performance problem N/A N/A

P0112 ← IAT sensor circuit low input × ×

P0113 ← IAT sensor circuit high input × ×

P0116 ← Engine coolant temperature circuit range/performance N/A N/A

P0117 ← ECT sensor circuit low input × ×

P0118 ← ECT sensor circuit high input × ×

P0122 ← TP sensor No.1 circuit low input × ×

P0123 ← TP sensor No.1 circuit high input × ×

P0125 ← Excessive time to enter closed loop fuel control N/A N/A

P0126 ← N/A N/A

 Coolant thermostat stuck open
P0128 ← N/A N/A

P0130 ← Front HO2S circuit problem × ×

P0131 ← Front HO2S circuit low input × ×

P0132 ← Front HO2S circuit high input × ×

P0133 ← Front HO2S circuit problem N/A N/A

P0134 ← Front HO2S no activity detected N/A ×

P0137 ← Rear HO2S circuit low input × ×

P0138 ← Rear HO2S circuit high input × ×

P0139 ← Rear HO2S circuit problem N/A N/A

P0140 ← Rear HO2S no activity detected N/A ×

P0222 ← TP sensor No.2 circuit low input × ×

P0223 ← TP sensor No.2 circuit high input × ×

P0300 ← Random misfire detected N/A ×

P0301 ← Cylinder No.1 misfire detected N/A ×

P0302 ← Cylinder No.2 misfire detected N/A ×

P0303 ← Cylinder No.3 misfire detected N/A ×

P0304 ← Cylinder No.4 misfire detected N/A ×

P0327 ← KS circuit low input × ×

P0328 ← KS circuit high input × ×

P0335 ← CKP sensor circuit problem N/A N/A

P0340 ← CMP sensor circuit problem N/A N/A

P0401 ← EGR flow insufficient detected N/A ×

P0403 ← EGR valve (stepping motor) circuit problem × ×

P0421 ← Warm up catalyst system efficiency below threshold N/A N/A

P0441 ← Evaporative emission control system incorrect purge flow N/A ×

P0442 ← Evaporative emission control system leak detected (small leak) N/A ×

P0443 ← Purge solenoid valve circuit problem × ×

P0446 ← Change over valve (COV) (EVAP system leak detection pump) stuck close N/A ×

P0455 ← Evaporative emission control system leak detected (gross leak) N/A ×

P0456 *1 ← Evaporative emission control system leak detected (very small leak) N/A ×

P0461 ← Fuel gauge sender unit range/performance problem N/A N/A

P0462 ← Fuel gauge sender unit circuit low input × ×

P0463 ← Fuel gauge sender unit circuit high input × ×

P0480 ← Cooling fan relay No.1 control circuit malfunction × ×

P0481 ← Cooling fan relay No.2 control circuit malfunction × ×

P0482 ← Cooling fan relay No.3 control circuit malfunction × ×

P0500 *4 ← VSS circuit problem N/A N/A

P0505 ← Idle speed control system problem N/A ×

P0506 ← Idle speed control system RPM lower than expected N/A N/A

P0507 ← Idle speed control system RPM higher than expected N/A ×

P050A ← Cold start idle air control system performance × ×

P050B ← Cold start ignition timing performance × ×

P0550 ← PSP switch circuit malfunction N/A N/A

P0564 ← Cruise control switch circuit malfunction N/A N/A

P0571 ← Brake switch circuit problem N/A N/A

P0601 ← PCM memory check sum error × ×

P0602 ← PCM programming error × ×

P0604 ← PCM random access memory (RAM) error × ×

P0606 ← PCM processor × ×

P0610 ← PCM vehicle options error × ×

P0638 ← Throttle actuator control circuit range/performance problem N/A N/A

P0661 ← Variable intake air solenoid valve circuit low input × ×

P0662 ← Variable intake air solenoid valve circuit high input × ×

P0703 ← Brake switch input circuit problem N/A N/A

P0704 *2 ← Clutch pedal position (CPP) switch input circuit problem N/A N/A

P0850 *2 ← Neutral switch input circuit problem N/A N/A

P1260 ← Immobilizer system problem × N/A

P2004 *5 N/A Variable tumble shutter valve stuck open × ×

P2006 *5 N/A Variable tumble shutter valve stuck closed × ×

P2009 *5 N/A Variable tumble solenoid valve circuit low input × ×

P2010 *5 N/A Variable tumble solenoid valve circuit high input × ×

P2088 ← Oil control valve (OCV) circuit low × ×

P2089 ← Oil control valve (OCV) circuit high × ×

P2096 ← Target A/F feedback system too lean N/A N/A

P2097 ← Target A/F feedback system too rich N/A N/A

P2101 ← Throttle actuator circuit range/performance N/A ×

P2107 ← Throttle actuator control module processor error N/A ×

P2108 ← Throttle actuator control module performance error N/A ×

P2109 ← TP sensor minimum stop range/performance problem N/A ×

P2112 ← Throttle actuator control system range/performance problem N/A ×

P2119 ← Throttle actuator control throttle body range/performance problem N/A ×

P2122 ← APP sensor No.1 circuit low input × ×

P2123 ← APP sensor No.1 circuit high input × ×

P2127 ← APP sensor No.2 circuit low input × ×

P2128 ← APP sensor No.2 circuit high input × ×

P2135 ← TP sensor No.1/No.2 voltage correlation problem × ×

P2138 ← APP sensor No.1/No.2 voltage correlation problem × ×

P2177 ← Fuel system too lean at off idle N/A ×

P2178 ← Fuel system too rich at off idle N/A ×

P2187 ← Fuel system too lean at idle N/A ×

P2188 ← Fuel system too rich at idle N/A ×

P2195 ← Front HO2S signal stuck lean N/A N/A

P2196 ← Front HO2S signal stuck rich N/A N/A

P2228 ← BARO sensor circuit low input × ×

P2229 ← BARO sensor circuit high input × ×

P2401 ← EVAP system leak detection pump motor circuit low N/A ×

P2402 ← EVAP system leak detection pump motor circuit high N/A ×

P2404 ← EVAP system leak detection pump sense circuit problem N/A ×
P2405 ← EVAP system leak detection pump sense circuit low input N/A ×

P2407 ← EVAP system leak detection pump sense circuit intermittent N/A ×

P2502 ← Charging system voltage problem N/A ×

P2503 ← Charging system voltage low N/A ×

P2504 ← Charging system voltage high N/A ×

P2507 ← PCM B+ voltage low × ×

P2610 ← PCM internal engine off timer performance N/A N/A

*1
California emission regulation applicable model
*2
MT
*3
C: CMDTC self-test, O: KOEO self-test, R: KOER self-test
*4
With ABS/DSC or MT without ABS/DSC
*5
AT

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2008 - MX-5 - Engine

PID/DATA MONITOR AND RECORD [LF]

The PID/DATA monitor items are shown below.

PID/DATA monitor table (reference)

Item
PCM
definition Unit/Condition
terminal
2008MY 2007MY

AAT ← Ambient air temperature °C °F —

AC_REQ ← Refrigerant pressure switch (high, low) On/Off 1AU

ACCS ← A/C relay On/Off 1I

AFR ← Air/fuel ratio — 2AD

AFR_ACT ← Actual air/fuel ratio — —

ALTF ← Generator field coil control duty value % 2AI

ALTT V ← Generator output voltage V 2AJ

APP ← Accelerator pedal position % 1AO, 1AP

← %
APP1 APP sensor No.1 1AO
← V

← %
APP2 APP sensor No.2 1AP
← V

ARPMDES ← Target engine speed RPM —

← Pa Bar psi
BARO Barometric pressure —
← V
BOO ← Brake switch On/Off 1AB, 1AF

BPA ← Brake pressure applied switch On/Off —

CATT11_DSD ← Catalyst temperature °C °F —

CHRGLP ← Generator warning light On/Off —

COLP ← Refrigerant pressure switch (middle) ON/OFF 1J

CPP*1 ← Clutch pedal position On/Off 1D

CPP/PNP *1 ← Shift lever position Drive/Neutral 1X

DTCCNT ← Number of DTC detected — —

← °C °F
ECT Engine coolant temperature 2AH
← V

EQ_RAT11 ← Actual lambda signal — —

EQ_RAT11_DSD ← Target lambda — —

ETC_ACT ← Throttle control ° —

← %
ETC_DSD Throttle control desired —
← °

EVAPCP ← Purge solenoid valve duty value % 2C

FAN1 ← Cooling fan relay No.1 control signal On/Off 1M

FAN2 ← Cooling fan relay No.2 control signal On/Off 1N

FAN3 ← Cooling fan relay No.3 control signal On/Off 1R

FLI ← Fuel level % —

FP ← Fuel pump relay On/Off 1H

2BB, 2BC,
FUELPW ← Fuel injector duration sec
2BD, 2AZ

OL/CL/

OL–Drive/
FUELSYS ← Fuel system status —
OL–Fault/

CL–Fault

GENVDSD ← Target generator voltage V —

HTR11 ← Front HO2S heater control On/Off 2BG

HTR12 ← Rear HO2S heater control On/Off 2BE

← °C °F
IAT Intake air temperature 1AT
← V

IMRC *6 N/A Variable tumble solenoid valve On/Off 2I

IMTV ← Variable intake air control On/Off 2J

1D*1,1X* 1
INGEAR ← Gears are engaged On/Off
—*6

IVS ← CTP condition Idle/Off Idle —

KNOCKR ← Knocking retard ° 2U

EVAP system leak detection pump detect incorrect purge

LDP_EVAPCP ← A —
flow

LDP_IDL ← EVAP system leak detection pump idle current A —

LDP_MON ← EVAP system leak detection pump monitoring current A —

LDP_REF ← EVAP system leak detection pump reference current A —

LDP_SLDV ← EVAP system small leak detection value A —

LDP_VSL_FV *2 ← EVAP system very small leak detection fail value mA/sec —
LDP_VSL_SV*2 ← EVAP system very small leak detection safe value mA/sec —

LDP_VSLDV *2 ← EVAP system very small leak detection value mA/sec —

LOAD ← Engine load % —

LONGFT1 ← Long term fuel trim % —

← g/sec
MAF Mass air flow 1AK
← V

← Pa psi Bar
MAP Manifold absolute pressure 2AG
← V

MIL ← Malfunction indicator lamp On/Off —

MIL_DIS ← Travelled distance since MIL illuminated km mile —

O2S11 ← Front HO2S A 2AD

O2S12 ← Rear HO2S V 2Q

PSP ← PSP switch Low/High 2T

Learnt/
RFCFLAG ← PCM adaptive memory produce verification —
Not Learnt

RO2FT1 ← Rear HO2S fuel trim — —

RPM ← Engine speed RPM 2W

SCCS ← Cruise control switch V 1AQ

2K, 2G,
SEGRP ← EGR control —
2L, 2H

SEGRP DSD ← EGR valve position desired % —

SHRTFT1 ← Short term fuel trim (front) % —

SHRTFT12 ← Short term fuel trim (rear) % —

SPARKADV ← Ignition timing ° 2S

test ← Test mode On/Off —

Heat radiation ratio (heat radiation when thermostat is

N/A malfunctioning/heat radiation when thermostat is normal) —
when thermostat monitoring is finished
TH_M —

Engine coolant temperature when thermostat monitoring

N/A °C °F
is finished

Upper limit of heat radiation ratio (heat radiation when

thermostat is malfunctioning/heat radiation when
N/A —
thermostat is normal) for thermostat monitoring
TH_M_MAX execution —

Upper limit of engine coolant temperature for thermostat

N/A °C °F
monitoring execution

Lower limit of heat radiation ratio (heat radiation when

thermostat is malfunctioning/heat radiation when
N/A —
thermostat is normal) for thermostat monitoring
TH_M_MIN execution —

Lower limit of engine coolant temperature for thermostat

N/A °C °F
monitoring execution

TIRESIZE ← Tire revolution per mile rev/mile —

TP REL ← Throttle position signal (relative value) % —

← %
TP1 TP sensor No.1 2AK
← V

← %
TP2 TP sensor No.2 2AL
← V

TPCT ← TP sensor voltage at CTP V —

VPWR ← Battery positive voltage V 1BA

2O*4

VSS ← Vehicle speed KPH mph

1AM *3, 5,
*3, 5
 1AI

VT ACT1 ← Actual valve timing ° 2E

Difference between target valve timing and actual valve

VT DIFF1 ← ° —
timing

VT DUTY1 ← OCV control) % 2E

VTC*6 N/A Variable tumble shutter valve control On/Off 2AE

*1
MT
*2
California emission regulation applicable model
*3
With ABS, DSC HU/CM
*4
MT without ABS/DSC
*5
AT without ABS/DSC
*6
AT

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2008 - MX-5 - Engine

SIMULATION TEST [LF]

The simulation items are shown below.

Simulation item table×: ApplicableN/A: Not applicable

Item Test condition

Applicable component Unit/condition PCM terminal
2008 MY 2007 MY KOEO KOER

ACCS ← A/C relay Off/On × × 1I

ALTF ← Generator (field coil) % N/A × 2AI

ARPMDES ← Target engine speed RPM × × —

EVAPCP ← Purge solenoid valve % × × 2C

FAN1 ← Cooling fan relay No.1 Off/On × × 1M

FAN2 ← Cooling fan relay No.2 Off/On × × 1N

FAN3 ← Cooling fan relay No.3 Off/On × × 1R

FP ← Fuel pump relay Off/On × × 1H

FUELPW1 ← Fuel injector % × × 2BB, 2BC, 2BD, 2AZ

GENVDSD ← Target generator voltage V N/A × —

HTR11 ← Front HO2S heater Off/On × × 2BG

HTR12 ← Rear HO2S heater Off/On × × 2BE

IMRC (AT) N/A Variable tumble solenoid valve Off/On × × 2I

IMTV ← Variable intake air solenoid valve Off/On × × 2J

INJ_1 ← Fuel injector No.1 OFF N/A × 2BB

INJ_2 ← Fuel injector No.2 OFF N/A × 2BC

INJ_3 ← Fuel injector No.3 OFF N/A × 2BD

INJ_4 ← Fuel injector No.4 OFF N/A × 2AZ

SEGRP ← EGR valve stepping motor position — × × 2K, 2G, 2L, 2H

test ← Test mode Off/On × × —

VT DUTY1 Wt ← CMP sensor % × × 2E

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2008 - MX-5 - Engine

INTAKE-AIR SYSTEM OUTLINE [LF]

Features

Improved engine torque Variable intake-air system adopted

Improved noise reduction Resonance chamber adopted

Improved emission gas purification Variable tumble system adopted (AT)

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2008 - MX-5 - Engine

INTAKE-AIR SYSTEM STRUCTURAL VIEW [LF]

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2008 - MX-5 - Engine

INTAKE-AIR SYSTEM VACUUM HOSE ROUTING DIAGRAM [LF]

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2008 - MX-5 - Engine

INTAKE MANIFOLD CONSTRUCTION [LF]

The intake manifold mainly consists of the variable intake air shutter valve actuator and variable tumble shutter
valve actuator (AT).

Made of hard plastic for weight reduction.

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2008 - MX-5 - Engine

INTAKE-AIR SYSTEM DIAGRAM [LF]

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2008 - MX-5 - Engine

VARIABLE TUMBLE SYSTEM FUNCTION [LF]

AT

The variable tumble system functions to lower emissions at cold-engine start.

At cold-engine start, the variable tumble system increases intake airflow speed by closing
the shutter valve and narrowing the intake passage. As a result, the air-fuel mixture
quality from the injector is improved. Additionally, the creation of a powerful air tumble in
the combustion chamber promotes the atomization of the air-fuel mixture. Due to this,
exhaust emission efficiency is improved.

For the variable tumble control, refer to CONTROL SYSTEM, Variable Tumble Control. (See
VARIABLE TUMBLE CONTROL OUTLINE [LF] .) (See VARIABLE TUMBLE CONTROL BLOCK
DIAGRAM [LF] .) (See VARIABLE TUMBLE CONTROL OPERATION [LF] .)

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2008 - MX-5 - Engine

VARIABLE TUMBLE SYSTEM OPERATION [LF]

AT

Engine speed less than 3,750 rpm and engine coolant temperature less than 63 °C {145 °F} (variable tumble shutter
valve is closed)

Intake manifold vacuum is applied to the variable tumble shutter valve actuator by the
operation of the variable tumble solenoid valve, closing the variable tumble shutter valve.
At this time, the intake passage is narrower than normal, increasing intake airflow speed
and also creating a powerful air tumble in the combustion chamber.

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2008 - MX-5 - Engine

VARIABLE TUMBLE SYSTEM STRUCTURE [LF]

AT

Mainly consists of the variable tumble solenoid valve, variable tumble shutter valve, variable
tumble shutter valve actuator, and vacuum chamber.

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2008 - MX-5 - Engine

VARIABLE TUMBLE SOLENOID VALVE CONSTRUCTION/OPERATION [LF]

AT

Construction

Mainly composed of the solenoid coil, spring, and plunger.

Operation

Energized

The solenoid coil magnetizes, pulling the plunger. The passage between A and B ports opens due to the
plunger being pulled, and intake manifold vacuum is applied to the actuator.

Not energized

The intake manifold vacuum passage is blocked, and the passage between ports B and C opens,
depressurizing the actuator.

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2008 - MX-5 - Engine

VARIABLE TUMBLE SOLENOID VALVE FUNCTION [LF]

AT

Switches the intake manifold vacuum passage between the dynamic chamber and the
variable tumble shutter actuator.

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2008 - MX-5 - Engine

VARIABLE TUMBLE SHUTTER VALVE ACTUATOR FUNCTION [LF]

AT

Opens and closes the variable tumble shutter valve.

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2008 - MX-5 - Engine

VARIABLE TUMBLE SHUTTER VALVE ACTUATOR CONSTRUCTION/OPERATION [LF]

AT

Construction

Mainly consists of the body, rod and diaphragm chamber spring.

Operation

Normally, the spring force presses against the rod, keeping the variable tumble shutter valve open. When
vacuum is applied to the diaphragm chamber from the dynamic chamber, the rod is pulled, closing the
variable tumble shutter valve.

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2008 - MX-5 - Engine

ENGINE CONTROL SYSTEM OUTLINE [LF]

Features

Improved emission gas purification Variable tumble control adopted (AT)

Specification

Item Specification

Variable tumble shutter valve switch (AT) ON/OFF

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2008 - MX-5 - Engine

ENGINE CONTROL SYSTEM STRUCTURAL VIEW [LF]

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2008 - MX-5 - Engine

ENGINE CONTROL SYSTEM DIAGRAM [LF]

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2008 - MX-5 - Engine

ENGINE CONTROL SYSTEM WIRING DIAGRAM [LF]

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2008 - MX-5 - Engine

ENGINE CONTROL SYSTEM BLOCK DIAGRAM [LF]

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2008 - MX-5 - Engine

ENGINE CONTROL SYSTEM RELATION CHART [LF]

X: Applied

Item

Input device

Neutral switch (MT) X X X X X X

CPP switch (MT) X X X X X

ECT sensor X X X X X X X X X X X

IAT sensor X X X X X X X X

CKP sensor X X X X X X X X X X X X

CMP sensor X X X

TP sensor No.1, No.2 X X X X X X X X X X X

APP sensor No.1, No.2 X X X X

MAF sensor X X X X X X X
Front HO2S X X

Rear HO2S X

MAP sensor X X X X X

BARO sensor (Built into PCM) X X X X X

KS X

Ignition switch X X X X

TR switch (AT) X X X X X X

Brake switch No.1, No.2 X X X X

A/C amplifier X X X X X

Refrigerant pressure switch (high, low) X X X X X

Refrigerant pressure switch (middle) X X X

Cruise control switch X

PSP switch X

Vehicle speed signal X X X X X X

Instrument cluster (Immobilizer related information) X

Instrument cluster X

DSC HU/CM X

ABS HU/CM or DSC HU/CM X

Generator (Terminal P: stator coil) X X X

Battery X X X X X X

TCM (AT) X X X

Output device
Main relay X

Fuel pump relay X

A/C relay X

Cooling fan relay No.1 X

Cooling fan relay No.2 X

Cooling fan relay No.3 X

Starter relay X

Purge solenoid valve X

EGR valve X

Variable intake air solenoid valve X

Variable tumble solenoid valve (AT) X

Throttle valve actuator X

Front HO2S heater X

Rear HO2S heater X

OCV X

TCM (AT) X

Fuel injector X

Ignition coil X

Generator (Terminal D: field coil) X

Instrument cluster X

ABS HU/CM or DSC HU/CM X

Keyless control module X

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2008 - MX-5 - Engine

PCM FUNCTION [LF]

Function List

The control descriptions are as shown below.

Function Description

Main relay When the ignition switch is turned to the ON position, the main relay turns on.
control

Drive-by- The drive-by-wire control calculates the optimum target throttle valve opening angle at all
wire control ranges of engine speeds and controls the throttle valve actuator.

Drive-by- Supplies power to the drive-by-wire control.

wire relay
control

Variable Switches energization of the variable shutter valve actuator according to engine speed to
intake air enhance the inertia charging effect.
control

Variable At cold engine start, the following effects occur due to the closing of the variable tumble control
tumble for improved cold engine emission performance.
control
(AT) Improved intake airflow speed near injectors

Strong air tumble occurs in the combustion changer, promoting vaporization

mixture of intake air and fuel

Variable Changes the intake valve timing according to engine operation conditions to improve engine
valve output, fuel economy and exhaust emission performance.
timing
control

Fuel Performs optimum fuel injection according to engine operation conditions.

injection
control

Fuel pump Performs energization of the fuel pump relay only when the engine is running (operates fuel
control pump) to improve stability and durability.

ESA control Controls ignition to optimum timing according to engine operation conditions.

Evaporative An appropriate amount of evaporative gas is fed into the dynamic chamber by the driving of
purge the purge solenoid valve according to the engine operation conditions to ensure driveability and
control prevent release of fuel vapor gas into the atmosphere.

EGR control Adjusts the EGR to the optimum opening angle according to engine operation conditions.

HO2S Based on the control of the front and rear HO2S heater, a stabilized oxygen concentration is
heater detected even at low exhaust gas temperature and feedback control of fuel injection even
control during cold engine start is made possible for improved cold temperature emission performance.

A/C cut-off The current application (energize/non-energize) to the A/C relay (magnetic clutch) is controlled
control according to the engine operation conditions to prevent deterioration of engine performance,
damage to the engine, and deterioration of the A/C function.

Electrical Through cooling of the radiator and condenser by operation of the cooling fan according to
fan control vehicle conditions, engine reliability and cooling performance have been improved.

Starter cut- Theft deterrence has been improved by controlling energization to the starter relay according
off control to an engine stop request signal from the immobilizer system.

Generator Generator output is optimized according to the engine operation and electrical load conditions,
control ensuring idling stability and anti-load performance.

CAN Used for communication with the EHPAS control module, ABS HU/CM, instrument cluster and
DLC 2.

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2008 - MX-5 - Engine

VARIABLE TUMBLE CONTROL BLOCK DIAGRAM [LF]

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2008 - MX-5 - Engine

VARIABLE TUMBLE CONTROL OPERATION [LF]

Operation conditions

When all of the following conditions are met, the PCM energizes the coil of variable tumble
solenoid valve. As a result, negative pressure is introduced to the diaphragm chamber of
the variable tumble shutter valve actuator, pulling the actuator rod and closing the variable
tumble shutter valve.

Engine speed less than 3,750 rpm

Engine coolant temperature less than 63 °C {145 °F}

Throttle valve opening angle is at the specified value or less (changes

according to engine speed)

Inhibition conditions

When a DTC for the ECT sensor or TP sensor has been stored, the variable tumble control
is inhibited and the variable tumble shutter valve is constantly open.

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VARIABLE TUMBLE CONTROL OUTLINE [LF]

At cold engine start, the following occur due to the closing of the variable tumble shutter
valve for improved cold engine exhaust emission performance.

Improved intake airflow speed near injectors

Strong air tumble occurs in the combustion changer, promoting

vaporization mixture of intake air and fuel

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VARIABLE TUMBLE SHUTTER VALVE SWITCH FUNCTION [LF]

The variable tumble shutter valve switch detects whether the variable tumble shutter valve
is open or closed.

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VARIABLE TUMBLE SHUTTER VALVE SWITCH CONSTRUCTION/OPERATION [LF]

The variable tumble shutter valve switch is installed in intake manifold.

The characteristics of the variable tumble shutter valve switch are adjusted before
shipment. Therefore, do not remove it from the intake manifold.

The output voltage characteristic of the variable tumble shutter valve switch is as shown in
the figure.

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