P1289A Manifold Tune Valve Circuit

NAME OF CODE
Manifold Tune Valve Solenoid Circuit

WHEN MONITORED
With the ignition key on and 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.

POSSIBLE CAUSES
- Open or shorted control circuit
- Open ASD relay output circuit
- Open or shorted solenoid coil
- Powertrain control module failure