P0660

DTC P0660

DTC DESCRIPTOR

DTC P0660
Intake Manifold Tuning (IMT) Valve Solenoid Control Circuit

DIAGNOSTIC FAULT INFORMATION




Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Testing and Inspection

CIRCUIT/SYSTEM DESCRIPTION
An ignition 1 voltage is supplied directly to the intake manifold tuning (IMT) valve solenoid or variable geometry induction system (VGIS). The engine control module (ECM) controls the IMT valve solenoid by grounding the control circuit via an internal driver switch. The primary function of the driver is to supply ground for the IMT valve solenoid. The ECM can determine if the control circuit is open, shorted to ground, or shorted to a voltage by monitoring the voltage on the control circuit.

CONDITIONS FOR RUNNING THE DTC
- The engine is operating.
- The ignition 1 voltage is between 7-16 volts.
- DTC P0660 runs continuously once the above condition is met.

CONDITIONS FOR SETTING THE DTC
The ECM detects that the commanded state of the driver and the actual state of the control circuit do not match for more than 10 seconds.

ACTION TAKEN WHEN THE DTC SETS
DTC P0660 is a Type B DTC.

CONDITIONS FOR CLEARING THE DTC
DTC P0660 is a Type B DTC.

CIRCUIT/SYSTEM VERIFICATION
1. Ignition ON, command the IMT valve solenoid ON and OFF with a scan tool. You should hear and feel an audible click.
2. If the vehicle passes the Circuit/System Verification Test, then operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records List.

CIRCUIT/SYSTEM TESTING
1. Ignition OFF, disconnect the harness connector of the IMT valve solenoid.
2. Connect a test lamp between the ignition 1 voltage circuit of the IMT valve solenoid and the negative terminal of the battery.

IMPORTANT: The test lamp is used to load the circuit and may not illuminate.

3. Ignition ON, test for less than 0.1 volt between the ignition 1 voltage circuit of the IMT valve solenoid and the positive terminal of the battery.
- If greater than 0.1 volt, repair the ignition 1 voltage circuit of the IMT valve solenoid for a short to ground or an open/high resistance. Replace the fuse, if necessary.
4. With the ignition OFF, connect a test lamp between the control circuit and the ignition 1 voltage circuit of the IMT valve solenoid.
5. With the ignition ON, use a scan tool to command the IMT valve solenoid ON and OFF. The test lamp should turn ON and OFF with the command.
- If the test lamp remains ON all the time, test for a short to ground on the control circuit. If circuit/connections test normal, replace the ECM.
- If the test lamp remains OFF all the time, test for a short to voltage or an open/high resistance on the control circuit. If circuit/connections test normal, replace the ECM.
6. If all circuits/connections test normal, replace the IMT valve solenoid.

REPAIR INSTRUCTIONS
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests