Electronic fuel injection system

PRODUCTIVITY IMPROVEMENT AND CENTER OF EXCELLENCY

TOT PROGRAM
PROJECT BASED TRANING MANUAL ON

ELECTRONIC FUEL INJECTION SYSTEM

PREPARED BY

AUTOMOTIVE DEPARTMENT

August 16

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Contents
1.1 Introduction ............................................................................................................................... 3
1.2 Objective ................................................................................................................................... 3
1.3 SPECIFIC OBJECTIVES ......................................................................................................... 3
1.4 Special Service Tools ................................................................................................................ 4
1.5 Symptom Troubleshooting Guide Chart ................................................................................... 5
1.6 Sensors and Components Location ........................................................................................... 7
1.6.1 ETC Description ............................................................................................................... 14
1.6.2 MAP Description.............................................................................................................. 19
1.6.3 ATS Description ............................................................................................................... 23
1.6.4 For Turbocharged vehicles ( BOOST Description) ......................................................... 25
1.6.5 Engine coolant temperature sensor Description ............................................................... 26
1.6.6 Crankshaft position sensor Description............................................................................ 28
1.6.7 Camshaft position sensor Description .............................................................................. 30
1.6.8 Knock sensor description ................................................................................................. 32
1.6.9 O2 Description ................................................................................................................. 34
1.6.10 RAIL Description ........................................................................................................... 36
1.6.11 APS Description ............................................................................................................. 38
1.7 GDI Description ...................................................................................................................... 40
1.8 PCSV Description ................................................................................................................... 42
1.9 CVVT Description .................................................................................................................. 43
1.10 For turbocharged vehicles (EWGT) Description .................................................................. 44
1.11 Turbocharged vehicles(RCV) Description ........................................................................... 47
1.12 Fuel pressure control valve Description ............................................................................... 49
1.13 Canister cloth valve Description ........................................................................................... 50

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1.1 Introduction
Because the field of automotive service is an ever-advancing and demanding profession, this institute
(Productivity improvement and center of excellency) has prepared this automotive training manual (ATM)
series it help its trainees to attain a higher degree of technical skills. Thus as you progress through this
training use this Electronic fuel injection system and related materials to their fullest for your advancement
and improve your and your customer satisfaction.

1.2 Objective
The aim of this training manual is to teach the basic construction, control, operation, and troubleshooting of
the Electronic fuel injection (EFI) system. Also after this training the trainee should have a full
understanding of the following, they should also be able to perform related inspections and repair based on
this understanding when appropriate workshop manual is used.

1.3 SPECIFIC OBJECTIVES

After completing the training lessons in this unit, Trainee should be able to:

 Know how EFI system function

 Know each sensor location and function
 Know how to diagnosis the EFI system by using diagnosis tools (scanner)
 Know how to diagnosis the sensor by using basic DOM(digital multi meter)
 Know how to diagnosis the sensor by using Oscilloscope.

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1.4 Special Service Tools

Item Illustration Application

Fuel Pressure Gauge

(09353-24100) Measuring the fuel line pressure

Fuel Pressure Gauge Adapter Connection between the high

(09353-02100) pressure fuel pump and the fuel feed
line

Heated Oxygen Sensor Socket

Wrench Removal and installation of the
(09392-1Y100) heated oxygen sensor

Fuel Pump Locking Ring Remover Removal and installation of the fuel
(09310-B9100) pump locking ring

Torque Wrench Socket

(09314-3Q100) or Removal and installation of the high
(09314-27130) (19mm) pressure fuel pipe

Injector Combustion Seal Guide &

Sizing tool Installation of the injector combustion
(09353-2B000) seal

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1.5 Symptom Troubleshooting Guide Chart

Main symptom Diagnostic procedure Also check for
1. Test the battery

Unable to start 2. Test the starter

(Engine does not turn
over) 3. Inhibitor switch (A/T) or clutch start switch (M/T)
• DTC

• Low compression
1. Test the battery
• Intake air leaks
2. Check the fuel pressure
Slipped or broken
3. Check the ignition circuit • timing belt
Unable to start
(Incomplete Troubleshooting the immobilizer system Contaminated
combustion) 4. (In case of immobilizer lamp flashing) • fuel
• DTC

• Low compression

1. Test the battery • Intake air leaks

2. Check the fuel pressure Contaminated

• fuel
3. Check the ECTS and circuit (Check DTC)
Weak ignition
Difficult to start 4. Check the ignition circuit • spark
1. Check the fuel pressure
• DTC
2. Check the Injector
• Low compression
Check the long term fuel trim and short term fuel trim
3. (Refer to CUSTOMER DATASTREAM) • Intake air leaks

4. Check the idle speed control circuit (Check DTC) Contaminated

• fuel
Poor idling 5. Inspect and test the Throttle Body
(Rough, unstable or Weak ignition
incorrect Idle) 6. Check the ECTS and circuit (Check DTC) • spark
1. Test the Battery
• DTC
2. Check the fuel pressure
• Intake air leaks
Engine stall 3. Check the idle speed control circuit (Check DTC)

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Contaminated
4. Check the ignition circuit • fuel

5. Check the CKPS Circuit (Check DTC) Weak ignition

• spark
1. Check the fuel pressure
• DTC
2. Inspect and test Throttle Body
• Low compression
3. Check the ignition circuit
• Intake air leaks
4. Check the ECTS and Circuit (Check DTC)
Contaminated
5. Test the exhaust system for a possible restriction • fuel

Poor driving Check the long term fuel trim and short term fuel trim (Refer to Weak ignition
(Surge) 6. CUSTOMER DATASTREAM) • spark
1. Check the fuel pressure

2. Inspect the engine coolant

• DTC
3. Inspect the radiator and the electric cooling fan
Contaminated
Knocking 4. Check the spark plugs • fuel
Check customer's driving habitsIs
· A/C on full time or the defroster mode on?
· Are tires at correct pressure? • DTC
· Is excessively heavy load being carried?
1. · Is acceleration too much, too often? • Low compression

2. Check the fuel pressure • Intake air leaks

3. Check the injector Contaminated

• fuel
4. Test the exhaust system for a possible restriction
Weak ignition
Poor fuel economy 5. Check the ECTS and circuit • spark
1. Test the canister close valve

Inspect the fuel filler hose/pipe

· Pinched, kinked or blocked? Malfunctioning
2. · Filler hose is torn gas station filling
nozzle (If this
Inspect the fuel tank vapor vent hose between problem occurs at
Hard to refuel 3. the canister and fuel tank air filter a specific gas
(Overflow during station during
refueling) 4. Check the canister • refueling)

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1.6 Sensors and Components Location

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17. Ambient Temperature Sensor (ATS)

1. Engine Control Module (ECM) 18. A/C Pressure Transducer (APT)
2. Manifold Absolute Pressure Sensor (MAPS) 19. ETC Motor [integrated into ETC Module]
3. Intake Air Temperature Sensor (IATS) 20. Injector
4. Boost Pressure Sensor (BPS) 21. Purge Control Solenoid Valve (PCSV)
5. Engine Coolant Temperature Sensor (ECTS) 22. CVVT Oil Control Valve (OCV) [Bank 1 /
6. Throttle Position Sensor (TPS) [integrated into ETC Intake]
Module] 23. CVVT Oil Control Valve (OCV) [Bank 1 /
7. Crankshaft Position Sensor (CKPS) Exhaust]
8. Camshaft Position Sensor (CMPS) [Bank 1 / Intake] 24. Electric Waste Gate Actuator (EWGA)
9. Camshaft Position Sensor (CMPS) [Bank 1 / Exhaust] 25. RCV Control Solenoid Valve
10. Knock Sensor (KS) 26. Fuel Pressure Control Valve
11. Heated Oxygen Sensor (HO2S) [Bank 1 / Sensor 1] 27. Canister Close Valve (CCV)
12. Heated Oxygen Sensor (HO2S) [Bank 1 / Sensor 2] 28. Ignition Coil
13. Rail Pressure Sensor (RPS) 29. Main Relay
14. Accelerator Position Sensor (APS) 30. Fuel Pump Relay
15. Fuel Tank Pressure Sensor (FTPS) 31. Data Link Connector (DLC) [16-Pin]
16. Fuel Level Sensor (FLS) 32. Multi-Purpose Check Connector [20-Pin]

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2. Manifold Absolute Pressure Sensor (MAPS)

1. Engine Control Module (ECM) 3. Intake Air Temperature Sensor (IATS)

4. Boost Pressure Sensor (BPS) 5. Engine Coolant Temperature Sensor (ECTS)

6. Throttle Position Sensor (TPS)

19. ETC Motor 7. Crankshaft Position Sensor (CKPS)

8. Camshaft Position Sensor (CMPS) [Bank 1 / Intake]

9. Camshaft Position Sensor (CMPS) [Bank 1 / Exhaust] 10. Knock Sensor (KS)

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11. Heated Oxygen Sensor (HO2S) [Bank 1/Sensor 1] 13. Rail Pressure Sensor (RPS)
12. Heated Oxygen Sensor (HO2S) [Bank 1/Sensor 2] 20. Injector

14. Accelerator Position Sensor (APS) 15. Fuel Tank Pressure Sensor (FTPS)

16. Fuel Level Sender (FLS) 17. Ambient Temperature Sensor (ATS)

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18. A/C Pressure Transducer (APT) 21. Purge Control Solenoid Valve (PCSV)

23. CVVT Oil Control Valve (OCV) [Bank 1 /

22. CVVT Oil Control Valve (OCV) [Bank 1 / Intake] Exhaust]

24. Electric Waste Gate Actuator (EWGA) 25. RCV Control Solenoid Valve

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26. Fuel Pressure Control Valve 27. Canister Close Valve (CCV)

29. Main Relay

28. Ignition Coil 30. Fuel Pump Relay

31. Data Link Connector (DLC) [16-Pin] 32. Multi-Purpose Check Connector [20-Pin]

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ECM Terminal And Input/Output signal

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1.6.1 ETC Description

The Electronic Throttle Control (ETC) System consists of a throttle body with an integrated control
motor and throttle position sensor (TPS). Instead of the traditional throttle cable, an Accelerator
Position Sensor (APS) is used to receive driver input. The ECM uses the APS signal to calculate
the target throttle angle; the position of the throttle is then adjusted via ECM control of the ETC
motor. The TPS signal is used to provide feedback regarding throttle position to the ECM. Using
ETC, precise control over throttle position is possible; the need for external cruise control
modules/cables is eliminated.

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1. Dry bearing 5. Magnet

2. DC motor 6. Hall IC
3. Non-contact hall sensor 7. Yoke
4. Gear 8. Stator

Schematic Diagram

Fail-Safe Mode
Item Fail-Safe
ETC Motor Throttle valve stuck at 7°
TPS 1 fault ECM looks at TPS2
TPS 2 fault ECM looks at TPS1
TPS TPS 1,2 fault Throttle valve stuck at 7°
APS 1 fault ECM looks at APS 2
APS 2 fault ECM looks at APS 1
APS APS 1,2 fault Engine idle state

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When throttle value is stuck at 7°, engine speed is limited at below 1,500rpm and vehicle speed at
maximum 40 ~ 50 km/h (25 ~ 31 mph)

Specification
[Throttle Position Sensor (TPS)]
Output Voltage (V)
Throttle angle(°) TPS1 TPS2
0 0.50 4.50
10 0.96 4.05
20 1.41 3.59
30 1.87 3.14
40 2.32 2.68
50 2.78 2.23
60 3.23 1.77
70 3.69 1.32
80 4.14 0.86
90 4.60 0.41
98 4.65 0.35
C.T (0) 0.50 4.50
W.O.T (86) 4.41 0.59

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Circuit Diagram

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Inspection
Throttle Position Sensor (TPS)
1. Connect the GDS on the Data Link Connector (DLC).
Start the engine and measure the output voltage of TPS 1 and 2 at C.T. and W.O.T.

Specification: Refer to “Specification”

2.
ETC Motor
1. Turn the ignition switch OFF.
2. Disconnect the ETC module connector.
3. Measure resistance between the ETC module terminals 1 and 2.
Check that the resistance is within the specification.

Specification: Refer to “Specification”

4.
Removal
1. Turn the ignition switch OFF and disconnect the battery negative (-) cable.
Remove the resonator and the air intake hose.
2. (Refer to Engine Mechanical System - “Air Cleaner”)
Disconnect the ETC module connector (A).

3.
4. Remove the installation bolts, and then remove the ETC module (A) from the engine.

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Installation

• Install the component with the specified torques.

Note that internal damage may occur when the component is dropped. If the component has been
• dropped, inspect before installing.
Install in the reverse order of removal.

Electronic throttle body Installation bolt:

7.8 ~ 9.8 N.m (0.8 ~ 1.0 kgf.m, 5.7 ~ 7.2 lb-ft)
1.
Adjustment
ETC module learning procedure
When installing new ETC module or re-installing it, ETC module learning procedure must be
performed.
1. Hold the ignition key or the start button at th IG ON position during 5 seconds.
2. Turn ignition swich OFF and then start the engine.

1.6.2 MAP Description

Manifold Absolute Pressure Sensor (MAPS) is a speed-density type sensor and is installed on the
surge tank. It senses absolute pressure of the surge tank and transfers the analog signal proportional
to the pressure to the ECM. By using this signal, the ECM calculates the intake air quantity and
engine speed. The MAPS consists of a piezo-electric element and a hybrid IC amplifying the
element output signal. The element is silicon diaphragm type and adapts pressure sensitive variable
resistor effect of semi-conductor. Because 100% vacuum and the manifold pressure apply to both

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sides of the sensor respectively, this sensor can output analog signal by using the silicon variation
proportional to pressure change.

Specification
Pressure
[kPa (kgf/cm?, psi)] Output Voltage (V)
32.5 (0.33, 4.71) 0.5
284 (2.90, 41.19) 4.5

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Signal Waveform

Circuit Diagram

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Specification
Temperature
°C °F Resistance (k?)
-40 -40 40.93 ~ 48.35
-20 -4 13.89 ~ 16.03
0 32 5.38 ~ 6.09
10 50 3.48 ~ 3.90
20 68 2.31 ~ 2.57
40 104 1.08 ~ 1.21
50 122 1.56 ~ 1.74
60 140 0.54 ~ 0.62
80 176 0.29 ~ 0.34

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1.6.3 ATS Description

Ambient Temperature Sensor (ATS) is installed on the front-end module and senses the ambient
temperature. ECM receives not only the intake air temperatue but also the ambient air temperature
informations at the same time to control the intake air quantity precisely provided through the
turbo charger. The electrical resistance of the thermistor decreases as the temperature increases,
and increases as the temperature decreases This sensor has a Negative Temperature Coefficient
(NTC) and its resistance is in inverse proportion to the temperature.

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Specification
Temperature[°C(°F)] Resistance (k?)
-40(-40) 841.2~1019.3
-20(-4) 263.8~306.5
0(32) 92.4~102.8
10(50) 57.0~62.2
20(68) 36.2~38.8
40(104) 15.3~16.7
50(122) 10.3~11.4
60(140) 7.1~8.0
80(176) 3.5~4.0

Circuit Diagram

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1.6.4 For Turbocharged vehicles (BOOST Description)

The Boost Pressure Sensor (BPS) is installed on the intercooler assembly and measures the
pressure of the compressed air in turbocharger.

Circuit Diagram

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1.6.5 Engine coolant temperature sensor Description

Engine Coolant Temperature Sensor (ECTS) is located in the engine coolant passage of the
cylinder head for detecting the engine coolant temperature. The ECTS uses a thermistor that
changes resistance with the temperature. The electrical resistance of the ECTS decreases as the
temperature increases, and increases as the temperature decreases. The reference +5V is supplied
to the ECTS via a resistor in the ECM. That is, the resistor in the ECM and the thermistor in the
ECTS are connected in series. When the resistance value of the thermistor in the ECTS changes
according to the engine coolant temperature, the output voltage also changes. During cold engine
operation, the ECM increases the fuel injection duration and controls the ignition timing using the
information of engine coolant temperature to avoid engine stalling and improve drivability.

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Specification
Temperature
°C °F Resistance (k?)
-40 -40 48.14
-20 -4 14.13 ~ 16.83
0 32 5.79
20 68 2.31 ~ 2.59
40 104 1.15
60 140 0.59
80 176 0.32

Circuit Diagram

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1.6.6 Crankshaft position sensor Description

Crankshaft Position Sensor (CKPS) detects the crankshaft position and is one of the most
important sensors of the engine control system. If there is no CKPS signal input, the engine may
stop because of CKPS signal missing. This sensor is installed in ladder frame and generates
alternating current by magnetic flux field which is made by the sensor and the target wheel when
the engine rotates. The target wheel consists of 58 slots and 2 missing slots on 360 CA (Crank
Angle).

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Specification
Item Specification
Coil Resistance (?) 774 ~ 946 [20°C (68°F)]
Waveform

This example shows a typical Crankshaft Position Sensor (CkPS) and Camshaft Position Sensor
(CMPS) waveform at idle. The PCM controls the injection and ignition timing by using these

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signals. Generally CkPS signal is used to detect the piston's position and CMPS signal is used to
detect the Top Dead Center of each cylinder.
Circuit Diagram

1.6.7 Camshaft position sensor Description

Camshaft Position Sensor (CMPS) is a hall sensor and detects the camshaft position by using a
hall element. It is related with Crankshaft Position Sensor (CKPS) and detects the piston position
of each cylinder which the CKPS can't detect. The CMPS is installed on engine head cover and
uses a target wheel installed on the camshaft. The Cam Position sensor is a hall-effect type
sensor. As the target wheel passes the Hall sensor, the magnetic field changes in the sensor. The
sensor then switches a signal which creates a square wave.

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Circuit Diagram

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1.6.8 Knock sensor description

Knocking is a phenomenon characterized by undesirable vibration and noise and can cause engine
damage. Knock Sensor (KS) is installed on the cylinder block and senses engine knocking. When
knocking occurs, the vibration from the cylinder block is applied as pressure to the piezoelectric
element. When a knock occurs, the sensor produces voltage signal. The ECM retards the ignition
timing when knocking occurs. If the knocking disappears after retarding the ignition timing, the
ECM will advance the ignition timing. This sequential control can improve engine power, torque
and fuel economy.

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Circuit Diagram

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1.6.9 O2 Description
Heated Oxygen Sensor (HO2S) consists of zirconium and alumina and is installed both upstream
and downstream of the Manifold Catalytic Converter. The sensor output voltage varies in
accordance with the air/fuel ratio.
The sensor must be hot in order to operate normally. To keep it hot, the sensor has a heater
which is controlled by the ECM via a duty cycle signal. When the exhaust gas temperature is
lower than the specified value, the heater warms the sensor tip.

Specification
HO2S [Bank 1/Sensor 1] (Linear type)
Item Specification
Heater Resistance (?) 2.4 ~ 4.0 [20°C(68°F)]

Item Specification
Heater Resistance (?) Approx. 9.0 [20°C(68°F)]

HO2S [Bank 1/Sensor 2] (Binary type)

A/F Ratio (?) Output Voltage(V)
RICH 0.6 ~ 1.0
LEAN 0 ~ 0.4

Item Specification
Heater Resistance (?) Approx. 9.0 [20°C(68°F)]

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Circuit Diagram

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1.6.10 RAIL Description

Rail Pressure Sensor (RPS) is installed on the delivery pipe and measures the instantaneous fuel
pressure in the delivery pipe. The sensing element (Semiconductor element) built in the sensor
converts the pressure to voltage signal. By using this signal, the ECM can control correct injection
amount and timing and adjusts the fuel pressure with the fuel pressure regulator valve if the target
pressure and the actual pressure calculated by the RPS output signal are different.

Specification

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Signal Waveform

Circuit Diagram

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Inspection
1. Connect the GDS on the Data Link Connector (DLC).
Measure the output voltage of the RPS at idle and various engine speed.
Condition Output Voltage (V)
Idle Approx. 1.2
1,500 rpm 2.2 ~ 2.5
2. 6,300 rpm Approx. 3.0

1.6.11 APS Description

Accelerator Position Sensor (APS) is installed on the accelerator pedal module and detects the
rotation angle of the accelerator pedal. The APS is one of the most important sensors in engine
control system, so it consists of the two sensors which adapt individual sensor power and ground
line. The second sensor monitors the first sensor and its output voltage is half of the first one. If
the ratio of the sensor 1 and 2 is out of the range (approximately 1/2), the diagnostic system
judges that it is abnormal.

Specification

Accelerator Output Voltage (V)

Position APS1 APS2
C.T 0.7 ~ 0.8 0.29 ~ 0.46
W.O.T 3.85 ~ 4.35 1.93 ~ 2.18

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Circuit Diagram

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1.7 GDI Description

The GDI injector is similar to a standard injector, but sprays fuel at a much higher pressure directly
into the combustion chamber and has a swirl disc to get the fuel swirling as it exits the nozzle. This
aids in atomization of the fuel. The ECM controls both the feed circuits (high side) to feed voltage
to the injectors and the ground circuits (low side) to energize the injectors. Also, the feed for 2
injectors comes from the same driver set. As the ignition coils are paired with cylinders (1-4 and
2-3), the injectors are also set up in pairs.

Specification
Item Specification
Coil Resistance (?) 1.5 ± 0.075 [20°C(68

Signal Waveform
The three waveforms below are taken from the #1 and #4 injectors. The top waveform is from the
high side (feed side) of the #1 and #4 injectors, while the middle waveform is from the low side
(ground side) of the #1 injector and the bottom waveform is from the low side of the #4
injector.The middle waveform is the same as the top waveform because there is no ground for the
circuit. With no current flowing in the circuit, the #1 injector is not energized and fuel does not
flow. The bottom waveform shows that ground is supplied and there is a voltage drop across the
#4 injector. With current flowing in the circuit, the #4 injector is energized and fuel flows.

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Circuit Diagram

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1.8 PCSV Description

Purge Control Solenoid Valve (PCSV) is installed on the surge tank and controls the passage
between the canister and the intake manifold. It is a solenoid valve and is open when the ECM
grounds the valve control line. When the passage is open (PCSV ON), fuel vapor stored in the
canister is transferred to the intake manifold.

Specification
Item Specification
Coil Resistance (?) 22.0 ~ 26.0 [20°C(68°F)]

Circuit Diagram

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1.9 CVVT Description

Continuous Variable Valve Timing (CVVT) system advances or retards the valve timing of the
intake and exhaust valve in accordance with the ECM control signal which is calculated by the
engine speed and load. By controlling CVVT, the valve over-lap or under-lap occurs, which makes
better fuel economy and reduces exhaust gases (NOx, HC) and improves engine performance
through reduction of pumping loss, internal EGR effect, improvement of combustion stability,
improvement of volumetric efficiency, and increase of expansion work.
 This system consist of
-the CVVT Oil Control Valve (OCV) which supplies the engine oil to the cam phaser or cuts the
engine oil from the cam phaser in accordance with the ECM PWM (Pulse With Modulation)
control signal,
- The CVVT Oil Temperature Sensor (OTS) which measures the engine oil temperature,
-and the Cam Phaser which varies the cam phase by using the hydraulic force of the engine oil.
The engine oil getting out of the CVVT oil control valve varies the cam phase in the direction
(Intake Advance/Exhaust Retard) or opposite direction (Intake Retard/Exhaust Advance) of the
engine rotation by rotating the rotor connected with the camshaft inside the cam phaser.

Specification
Item Specification
Coil Resistance (?) 6.9 ~ 7.9 [20°C(68°F)]

Circuit Diagram

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1.10 For turbocharged vehicles (EWGT) Description

The Electric WGT Control Actuator is installed on the turbocharger. It operates the vain in the
Waste Gate Turbocharger (WGT) and regulates the compressed air amount by the ECM's PWM
signal. This actuator consists of a DC motor which actuates the vane, a 2-step gear which
increases torque of the DC motor, a position sensor which detects status of the vane, an electric
control unit which drives the DC motor.

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Specification
[EWGA Position Sensor]
Range of Rod
[mm],
Position Output Voltage[V] Operating Angle[°] reference
Mechanical Close end stop Position (MCP) 4.8 0 0
Electrical Close end stop Position (ECP) 4.2 12 1.8
Electrical Open end stop Position (EOP) 1 79 16
Mechanical Open end stop Position (MOP) 0.5 90 18

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[EWGA DC Motor]
Item Specification
Coil Resistance (?) 1.44 ~ 1.96 [21°C(69.8°F)
Signal Waveform

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Circuit Diagram

1.11 Turbocharged vehicles(RCV) Description

RCV (Recirculation Valve) Control Solenoid Valve is installed on the cooling pan motor top and
operates the RCV actuator which controls the by-pass passage of the turbo-charged compressor.
When the throttle valve is closed during engine running [Tip-out], crash noise of the impeller
will occur because of rapid increasing of the boost pressure. So, in this case, in order to prevent
this phenomenon, ECM maintains the appropriate boost pressure by opening the by-pass
passage.

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Specification
Item Specification
Coil Resistance(?) 28.3 ~ 31.1 [20°C(68°F)]
Circuit Diagram

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1.12 Fuel pressure control valve Description

Fuel Pressure Control Valve (FPCV) is installed on the high pressure fuel pump and controls fuel
flow flowing into the injectors in accordance with the ECM signal calculated based on various
engine condition.

Specification
Item Specification
Coil Resistance (?) 0.5 [20°C(68°F)
Signal Waveform

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Circuit Diagram

1.13 Canister close valve Description

Canister Close Valve (CCV) is installed on the canister ventilation line. It seals evaporative
emission control system by shutting the canister from the atmosphere when leakage detecting
system operates.

Specification
Item Specification
Coil Resistance (?) 19.8 ~ 21.8 [20°C(68°F)

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Circuit Diagram

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