Manifold Tune Valve Solenoid Circuit

WHEN MONITORED
With the ignition key on and the engine running.

SET CONDITION
The MTV solenoid control circuit is not in the expected state when requested to operate by the PCM.

THEORY OF OPERATION
The MTV solenoid is actuated by the PCM at wide open throttle and below 3008 engine rpm.

This solenoid controls a manifold mounted servo that power tunes the manifold.

The PCM looks for a current spike when actuating the solenoid.

- If the spike is not present, the PCM sets a trouble code.

PROBABLE CAUSES
- open or shorted control circuit
- Open or fused ignition switch output circuit
- Open or shorted solenoid control coil
- PCM failure