For 1990-2009 cars

### 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 Descriptor

DTC P0660 00: Intake Manifold Tuning Valve Solenoid Control Circuit

### Circuit/System Description

Ignition voltage is supplied directly to the intake manifold tuning solenoid valve. The engine control module (ECM) controls the intake manifold tuning solenoid valve by grounding the control circuit via an internal driver switch. The primary function of the driver is to supply ground for the intake manifold tuning solenoid valve. 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 voltage is between 7-16 V.

• | DTC P0660 00 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 greater than 10 s.

### Action Taken When the DTC Sets

DTC P0660 00 is a Type C DTC

### Conditions for Clearing the DTC

DTC P0660 00 is a Type C DTC

### Reference Information

#### Schematic Reference

Engine Controls Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Air Intake System Description

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Verification

1. Engine idling, command the intake manifold tuning solenoid valve ON with a scan tool. The intake manifold tuning solenoid valve vacuum actuator should move to the closed position.
2. 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

1. Ignition OFF, disconnect the harness connector of the Q22 Intake Manifold Tuning (IMT) Solenoid Valve.
2. Ignition ON, verify a test lamp illuminates between the ignition voltage circuit terminal 1 and ground.

⇒ | If the test lamp does not illuminate, repair the ignition voltage circuit for a short to ground or an open/high resistance. Replace the F47 fuse, if necessary.

3. Ignition OFF, connect a test lamp between the control circuit terminal 2 and the ignition voltage circuit terminal 1.
4. Ignition ON, command the Intake Manifold Tuning Control Valve solenoid Open and Closed with a scan tool. The test lamp should turn ON when the solenoid is commanded Closed, and OFF when the solenoid is commanded Open.

⇒ | If the test lamp is always ON, test for a short to ground on the K20 Engine Control Module (ECM) pin 44 (X2) control circuit. If circuit tests normal, replace the K20 Engine Control Module (ECM).

⇒ | If the test lamp is always OFF, test for a short to voltage or an open/high resistance on the K20 Engine Control Module (ECM) pin 44 (X2) control circuit. If circuit tests normal, replace the K20 Engine Control Module (ECM).

5. If all circuits test normal, test or replace the Q22 Intake Manifold Tuning (IMT) Solenoid Valve.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | need link for Intake Manifold Tuning Valve Actuator Solenoid Replacement

• | Control Module References for ECM replacement, setup, and program