Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptors
DTC P0661: Intake Manifold Tuning (IMT) Valve Solenoid Control Circuit Low VoltageDTC P0662: Intake Manifold Tuning (IMT) Valve Solenoid Control Circuit High Voltage
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Ignition 1 Voltage | P0661 | P0661 | -- | -- |
IMT Valve Control Circuit | P0661 | P0661 | P0662 | -- |
Circuit/System Description
An ignition 1 voltage is supplied to the intake manifold tuning (IMT) valve solenoid. 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 ignition is ON. |
| • | The DTCs run 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.
Action Taken When the DTC Sets
DTCs P0661 and P0662 are Type A DTCs.
Conditions for Clearing the DTC
DTCs P0661 and P0662 are Type A DTCs.
Reference Information
Schematic Reference
Connector End View Reference
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Ignition On, command the IMT valve solenoid ON and OFF with a scan tool. You should hear and feel an audible click.
- Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the IMT valve solenoid.
- Ignition ON, test for battery voltage between the ignition 1 voltage circuit terminal 2 and ground.
- Ignition OFF, connect a test lamp between the control circuit terminal 1 and the ignition 1 voltage circuit terminal 2.
- Ignition ON, command the IMT valve solenoid ON and OFF with a scan tool. The test lamp should turn ON and OFF with the command.
- If all circuits test normal, test or replace the IMT valve solenoid.
| ⇒ | If less than B+, repair the ignition 1 voltage circuit for a short to ground or an open/high resistance. Replace the fuse, if necessary. |
| ⇒ | If the test lamp is always ON, test the control circuit for a short to ground. If circuit tests normal, replace the ECM. |
| ⇒ | If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for engine control module replacement, setup, and programming |
