Diagnostic Instructions

DTC Descriptors

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

DTC P0661: Intake Manifold Tuning (IMT) Valve Solenoid Control Circuit Low Voltage

DTC 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	--¹	P0661	--	P0660
IMT Valve Control Circuit	P0661	P0661	P0662	P0660
¹ The Engine Cranks but Does Not Run and opens the fuse that supplies voltage to the IMT valve solenoid.

Circuit/System Description

An ignition 1 voltage is supplied directly 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

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 2 seconds.

Action Taken When the DTC Sets

DTCs P0660, P0661, and P0662 are Type B DTCs.

Conditions for Clearing the DTC

DTCs P0660, P0661, and P0662 are Type B DTCs.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Description and Operation

Air Intake System Description

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Circuit/System Verification

1. Ignition ON, command the IMT valve solenoid ON with a scan tool. You should hear and feel an audible click when the solenoid turns ON and OFF for about 3-5 seconds.
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 Data List.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the IMT valve solenoid.
2. Ignition ON, test for B+ between the ignition 1 voltage circuit and ground.

⇒	If less than the specified range, test the ignition 1 voltage circuit for a short to ground or an open/high resistance. Replace the fuse, if necessary.

3. Connect a test lamp between the control circuit and the ignition 1 voltage circuit.
4. Command the IMT valve solenoid ON with a scan tool . The test lamp should turn ON and OFF for about 3-5 seconds.

⇒	If the test lamp is always ON, test the control circuit for a short to ground. If the 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.

5. If all circuits test normal, test or replace the IMT valve solenoid.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.