05–43

DIAGNOSTICS – SFI SYSTEM 05AIH–08

DTC P0010 CAMSHAFT POSITION ”A” ACTUATOR

CIRCUIT (BANK 1)

CIRCUIT DESCRIPTION
The Variable Valve Timing (VVT) system includes the ECM, the Oil Control Valve (OCV) and the VVT control-
ler. The ECM sends a target ”duty–cycle” control signal to the OCV. This control signal, applied to the OCV,
regulates the oil pressure supplied to the VVT controller. Camshaft timing control is performed based on en-
gine operation conditions such as intake air volume, throttle position and engine coolant temperature.
The ECM controls the OCV, based on the signals output from the sensors. The VVT controller regulates the
intake camshaft angle using oil pressure through the OCV. As result, the relative position between the cam-
shaft and the crankshaft is optimized, and the engine torque improves, fuel economy improves, and exhaust
emissions decrease under overall driving conditions. Also, the ECM detects the actual valve timing using
signals from the camshaft position sensor and the crankshaft position sensor, and performs feedback con-
trol. This is how target valve timing is verified by the ECM.

ECM

Crankshaft Position Sensor

Camshaft Timing
Mass Air Flow Sensor Target Valve Timing Oil Control
Valve (OCV)
Throttle Position Sensor

Feedback
Duty Control
Engine Coolant Temp. Sensor
Correction
Vehicle Speed Signal

Camshaft Position Sensor Actual Valve Timing

A71007

DTC No. DTC Detection Condition Trouble Area

Open or short in oil control valve circuit
P0010 Open or short in oil control valve circuit
Oil control valve

ECM

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DIAGNOSTICS – SFI SYSTEM

MONITOR DESCRIPTION
After the ECM sends the ”target” duty–cycle signal to the OCV, the ECM monitors the OCV current to estab-
lish an ”actual” duty–cycle. The ECM detects a malfunction and sets a DTC when the actual duty–cycle ratio
varies from the target duty–cycle ratio.
MONITOR STRATEGY
Related DTCs P0010 VVT oil control valve bank 1 range check
Required sensors/components OCV
Frequency of operation Continuous
Duration 1 sec
MIL operation Immediately
Sequence of operation None

TYPICAL ENABLING CONDITIONS

Specification
Item
Minimum Maximum
The monitor will run whenever the follow-
See ”List of Disable a Monitor” table (On page 05–24)
ing DTCs are not present
Battery voltage 11 V 13 V
Turget duty ratio – 70 %
Starter OFF
Current cut status Not cut

TYPICAL MALFUNCTION THRESHOLDS

Detection Criteria Threshold
”Output duty is 3 % or less despite the ECM supplying the current the OCV” or
Output signal duty for OCV
”Output duty is 100 % or more”

COMPONENT OPERATING RANGE

Parameter Standard Value
Output signal duty for OCV ”More than 3 %” and ”Less than 100 %”

WIRING DIAGRAM

C2 ECM
Camshaft Timing Oil
Control Valve
2 15
R–Y
E5 OCV+
14
1 R–B
E5 OCV–

A59779

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DIAGNOSTICS – SFI SYSTEM

INSPECTION PROCEDURE
HINT:
Read freeze frame data using the hand–held tester or the OBD II scan tool. Freeze frame data records the
engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether
the vehicle was running or stopped, the engine was warmed up or not, the air–fuel ratio was lean or rich,
etc. at the time of the malfunction.
Hand–held tester:
1 PERFORM ACTIVE TEST BY HAND–HELD TESTER(OPERATE OCV)

(a) Connect the hand–held tester to the DLC3.

(b) Start the engine and warm it up.
(c) Turn the ignition switch ON and push the hand–held tester main switch ON.
(d) Select the item ”DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / VVT CTRL B1”.
(e) Check the engine speed when operating the OCV by the hand–held tester.
Standard:
Tester Operation Specified Condition
OCV is OFF Normal engine speed
OCV is ON Rough idle or engine stall

OK CHECK FOR INTERMITTENT PROBLEMS

(See page 05–41)

NG

2 INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSY(OCV)

(See page 10–2)

NG REPLACE CAMSHAFT TIMING OIL CONTROL

VALVE ASSY

OK

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DIAGNOSTICS – SFI SYSTEM

3 CHECK ECM(OCV SIGNAL)

(a) During idling, check the waveform between the specified

terminals of the E5 ECM connector using the oscillo-
E5
scope.
Standard:
Tester Connection Specified Condition
OCV+ (E5–15) – OCV– (E5–14) Correct waveform is as shown

OCV + OCV–

OCV Signal Waveform

5 V/
Division

GND

1 msec./Division
A79111 NG REPLACE ECM (See page 10–17)

OK

4 CHECK HARNESS AND CONNECTOR(CAMSHAFT TIMING OIL CONTROL VALVE

(OCV) – ECM)

Wire Harness Side (a) Disconnect the C2 camshaft timing oil control valve con-
Camshaft Timing Oil Control Valve nector.
Connector (b) Disconnect the E5 ECM connector.
(c) Measure the resistance between the wire harness side
C2
connectors.
Standard (Check for open):
Tester Connection Specified Condition
Front View Oil control valve (C2–1) – OCV+ (E5–15)
Below 1 Ω
A54386 Oil control valve (C2–2) – OCV– (E5–14)
Standard (Check for short):
Tester Connection Specified Condition
Oil control valve (C2–1) or OCV+ (E5–15) – Body ground
10 kΩ or higher
E5 Oil control valve (C2–2) or OCV– (E5–14) – Body ground
(d) Reconnect the camshaft timing oil control valve connec-
tor.
(e) Reconnect the ECM connector.
NG REPAIR OR REPLACE HARNESS OR
OCV+ OCV–
CONNECTOR
ECM Connector A65743

OK

CHECK FOR INTERMITTENT PROBLEMS (See page 05–41)

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DIAGNOSTICS – SFI SYSTEM

OBDII scan tool (excluding hand–held tester):

1 CHECK CAMSHAFT TIMING OIL CONTROL VALVE ASSY(OPERATE OCV)

Component Side (a) Disconnect the C2 camshaft timing oil control valve con-
Camshaft Timing Oil Control Valve nector.
(b) Apply positive battery voltage between the terminals of
C2
the camshaft timing oil control valve.
(c) Check the engine speed.
Standard:
(–) (+)
Engine speed is rough idle or engine is stalled.
(d) Reconnect the camshaft timing oil control valve connec-
Front View
A76968 tor.
NG REPLACE CAMSHAFT TIMING OIL CONTROL
VALVE ASSY

OK

2 CHECK ECM(OCV SIGNAL)

(a) During idling, check the waveform between the specified

terminals of the E5 ECM connector using the oscillo-
E5
scope.
Standard:
Tester Connection Specified Condition
OCV+ (E5–15) – OCV– (E5–14) Correct waveform is as shown

OCV + OCV–

OCV Signal Waveform

5 V/
Division

GND

1 msec./Division
A79111

NG REPLACE ECM (See page 10–17)

OK

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DIAGNOSTICS – SFI SYSTEM

3 CHECK HARNESS AND CONNECTOR(CAMSHAFT TIMING OIL CONTROL VALVE

(OCV) – ECM)

Wire Harness Side (a) Disconnect the C2 camshaft timing oil control valve con-
Camshaft Timing Oil Control Valve nector.
Connector (b) Disconnect the E5 ECM connector.
(c) Measure the resistance between the wire harness side
C2
connectors.
Standard (Check for open):
Tester Connection Specified Condition
Front View Oil control valve (C2–1) – OCV+ (E5–15)
Below 1 Ω
A54386 Oil control valve (C2–2) – OCV– (E5–14)
Standard (Check for short):
Tester Connection Specified Condition
Oil control valve (C2–1) or OCV+ (E5–15) – Body ground
10 kΩ or higher
E5 Oil control valve (C2–2) or OCV– (E5–14) – Body ground
(d) Reconnect the camshaft timing oil control valve connec-
tor.
(e) Reconnect the ECM connector.

OCV+ OCV–
NG REPAIR OR REPLACE HARNESS OR
ECM Connector A65743 CONNECTOR

OK

CHECK FOR INTERMITTENT PROBLEMS (See page 05–41)

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