Diagnosis Procedure
1.
CHECK THE ECM POWER SUPPLY AND GROUND CIRCUIT
Refer to Diagnosis Procedure
DTC Diagnosis Procedure
.
Is the inspection result normal?
.
Repair or replace error-detected parts.
2.
CHECK INTAKE MANIFOLD TUNING VALVE ACTUATOR OUTPUT SIGNAL CIRCUIT
Disconnect intake manifold tuning valve motor harness connector.
Check the continuity between intake manifold tuning valve actuator harness connector and ECM harness connector.
+
−
Continuity
Intake manifold tuning valve actuator
ECM
Connector
Terminal
Connector
Terminal
F84
1
F52
71
Not existed
72
Existed
2
71
Existed
72
Not existed
Also check harness for short to ground and to power.
Is the inspection result normal?
.
Repair or replace error-detected parts.
3.
CHECK INTAKE MANIFOLD TUNING VALVE ACTUATOR
Check the intake manifold tuning valve actuator. Refer to
Component Inspection
.
Is the inspection result normal?
Check intermittent incident. Refer to Intermittent Incident
Intermittent Incident
.
Replace intake manifold assembly. Refer to
Removal and Installation
.