Diagnosis Procedure
- CHECK EXHAUST VALVE TIMING CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT - 1
- Turn ignition switch OFF.
- Disconnect exhaust valve timing control solenoid valve harness connector.
- Turn ignition switch ON.
- Check the voltage between exhaust valve timing control solenoid valve harness connector and ground.
DTC
+
-
Voltage
Exhaust valve timing control solenoid valve
Bank
Connector
Terminal
P0078
1
F78
1
Ground
Battery voltage
P0084
2
F79
1
Is the inspection result normal?
YES
GO TO 2.
NO
GO TO 4.
- CHECK EVT CONTROL SOLENOID VALVE OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
- Turn ignition switch OFF.
- Disconnect ECM harness connector.
- Check the continuity between exhaust valve timing control solenoid valve harness connector and ECM harness connector.
DTC
+
-
Continuity
Exhaust valve timing control solenoid valve
ECM
Bank
Connector
Terminal
Connector
Terminal
P0078
1
F78
2
F14
58
Existed
P0084
2
F79
2
60
- Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
GO TO 3.
NO
Repair open circuit, short to ground or short to power in harness or connectors.
- CHECK EXHAUST VALVE TIMING CONTROL SOLENOID VALVE
Check exhaust valve timing control solenoid valve. Refer to Component Inspection .
Is the inspection result normal?
YES
INSPECTION END
NO
Replace malfunctioning exhaust valve timing control solenoid valve. Refer to Exploded View .
- CHECK EXHAUST VALVE TIMING CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT - 2
- Turn ignition switch OFF.
- Disconnect IPDM E/R harness connector.
- Check the continuity between IPDM E/R harness connector and exhaust valve timing control solenoid valve harness connector.
DTC
+
-
Continuity
IPDM E/R
Exhaust valve timing control solenoid valve
Connector
Terminal
Connector
Terminal
P0075
F50
59
F78
1
Existed
P0081
F79
Existed
- Also check harness for short to ground.
Is the inspection result normal?
YES
Perform the trouble diagnosis for power supply circuit.
NO
Repair or replace error-detected parts.