Diagnosis Procedure
- CHECK EXHAUST VALVE TIMING CONTROL SOLENOID VALVE POWER SUPPLY
- 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
F77
1
Ground
Battery voltage
P0084
2
F80
1
Is the inspection result normal?
YES
GO TO 3.
NO
GO TO 2.
- CHECK EXHAUST VALVE TIMING CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT
- Turn ignition switch OFF.
- Disconnect IPDM E/R harness connector.
- Check the continuity between exhaust valve timing control solenoid valve harness connector and IPDM E/R harness connector.
DTC
Exhaust valve timing control solenoid valve
IPDM E/R
Continuity
Bank
Connector
Terminal
Connector
Terminal
P0078
1
F77
1
F19
59
Existed
P0084
2
F80
1
- Also check harness for short to ground.
Is the inspection result normal?
YES
INSPECTION END
NO
Repair or replace error-detected parts.
- CHECK EXHAUST VALVE TIMING CONTROL SOLENOID VALVE OUTPUT SIGNAL CIRCUIT
- 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
Exhaust valve timing control solenoid valve
ECM
Continuity
Bank
Connector
Terminal
Connector
Terminal
P0078
1
F77
2
F79
157
Existed
P0084
2
F80
2
F79
158
- Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
GO TO 4.
NO
Repair or replace error-detected parts.
- CHECK EXHAUST VALVE TIMING CONTROL SOLENOID VALVE
Check exhaust valve timing control solenoid valve control solenoid valve. Refer to Component Inspection (Exhaust Valve Timing Control Solenoid Valve) .
Is the inspection result normal?
YES
INSPECTION END
NO
Replace malfunctioning exhaust valve timing control solenoid valve. Refer to VALVE TIMING CONTROL .