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Diagnosis Procedure
1.CHECK INTAKE MANIFOLD TUNING VALVE ACTUATOR POWER SUPPLY
  1. Turn ignition switch ON.
  2. Check the voltage between ECM harness connector.
    ECMVoltage
    +-
    ConnectorTerminalConnectorTerminal
    F5272E16160Battery voltage
Is the inspection result normal?
.
Perform the trouble diagnosis for power supply circuit.
 
2.CHECK INTAKE MANIFOLD TUNING VALVE ACTUATOR POWER SUPPLY CIRCUIT
  1. Turn ignition switch OFF.
  2. Disconnect intake manifold tuning valve actuator harness connector.
  3. Check the continuity between intake manifold runner control valve motor harness connector and ECM harness connector.
    +−Continuity
    ECMIntake manifold tuning valve actuator
    ConnectorTerminalConnectorTerminal
    F5272F841Existed
Is the inspection result normal?
.
Repair or replace error-detected parts.
 
3.CHECK INTAKE MANIFOLD TUNING VALVE ACTUATOR GROUND CIRCUIT
  1. Disconnect intake manifold tuning valve actuator harness connector.
  2. Check the continuity between intake manifold runner control valve motor harness connector and ECM harness connector.
    +−Continuity
    Intake manifold tuning valve actuatorECM
    ConnectorTerminalConnectorTerminal
    F842F5271Existed
Is the inspection result normal?
.
Repair or replace error-detected parts.
 
4.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 IncidentIntermittent Incident.
Replace intake manifold assembly. Refer to Removal and Installation.