P0660
DTC P0660, P0661, or P0662
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC P0660
- Intake Manifold Tuning Control Valve Control Circuit
DTC P0661
- Intake Manifold Tuning Control Valve Control Circuit Low Voltage
DTC P0662
- Intake Manifold Tuning Control Valve Control Circuit High Voltage
Diagnostic Fault Information
Circuit/System Description
The intake manifold tuning valve controls the length of the intake runners in the intake manifold. The intake manifold contains both long and short runners. The tuning valve controls only the short runners. When the valve is closed, the short runners are blocked, which forces the air through the long runners. This results in tuning effects in the manifold that increases the torque produced by the engine at lower engine speeds. When the valve is open, both the long runners and short runners are open, but the majority of the air travels through the short runners, since the air will naturally follow the shortest path into the cylinder. This allows the air to flow through the short runners, which results in increased torque at higher engine speeds.
Ignition voltage is supplied directly to the intake manifold tuning valve actuator. The engine control module (ECM) controls the valve actuator motor by grounding the control circuit with a solid state device called a driver. The driver is equipped with a feedback circuit that is pulled up to a voltage. The ECM can determine if the control circuit is open, shorted to ground, or shorted to a voltage by monitoring the feedback voltage signal.
The tuning valve actuator contains a position sensor, which outputs a pulse width modulated (PWM) signal, to detect the actual position of the tuning valve in relation to its commanded position. Variations in the duty cycle of the PWM signal enables the ECM to detect a physically broken, restricted or stuck tuning valve.
Conditions for Running the DTC
* Engine speed is at least 400 rpm.
* The battery voltage is at least 11 V.
* DTCs P0660, P0661 and P0662 run continuously when the above conditions are met.
Conditions for Setting the DTC
P0660
The ECM detects an open circuit on the intake manifold tuning valve control circuit for greater than 0.5 s.
P0661
The ECM detects a short to ground or an open circuit on the intake manifold tuning valve control circuit for greater than 0.5 s.
P0662
The ECM detects a short to voltage on the intake manifold tuning valve control circuit for greater than 0.5 s.
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 [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Fuel Pump and Level Sensor Assembly
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
1. Engine running.
2. Verify a click is heard or felt from the Q22 Intake Manifold Tuning Solenoid Valve when commanding the Intake Manifold Tuning Control Valve Open and Closed with a scan tool.
• If a click is not heard or felt
Refer to Circuit/System Testing
• If a click is heard or felt
3. Verify the circuit status parameters listed below do not display Malfunction when commanding the Intake Manifold Tuning Control Valve Open and Closed with a scan tool:
* Intake Manifold Tuning Control Valve Control Circuit High Voltage Test Status
* Intake Manifold Tuning Control Valve Control Circuit Open Test Status
* Intake Manifold Tuning Control Valve Control Circuit Low Voltage Test Status
• If Malfunction is displayed
Refer to Circuit/System Testing
• If Malfunction is not displayed
4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
• If a DTC sets
Refer to Circuit/System Testing
• If a DTC does not set
5. All OK.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the Q22 Intake Manifold Tuning Solenoid Valve. Ignition ON.
2. Verify that a test lamp illuminates between the ignition circuit terminal 1 and ground.
• If the test lamp does not illuminate and the circuit fuse is good
1. Ignition OFF, remove the test lamp.
2. Test for less than 2 ohms in the ignition circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse.
• If the test lamp does not illuminate and the circuit fuse is open
1. Ignition OFF, remove the test lamp.
2. Test for infinite resistance between the ignition circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the Intake Manifold.
• If the test lamp illuminates
3. Verify that a test lamp does not illuminate between the control circuit terminal 2 and the ignition circuit terminal 1.
• If the test lamp illuminates
1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.
2. Test for infinite resistance between the control circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the K20 Engine Control Module.
• If the test lamp does not illuminate
4. Remove the test lamp.
5. Verify the scan tool Intake Manifold Tuning Control Valve Control Circuit High Voltage Test Status parameter is OK when commanding the Intake Manifold Tuning Control Valve Open with a scan tool.
• If OK is not displayed
1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON.
2. Test for less than 1 V between the control circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K20 Engine Control Module.
• If OK is displayed
6. Install a 3 A fused jumper wire between the control circuit terminal 3 and the ignition circuit terminal 1.
7. Verify the scan tool Intake Manifold Tuning Control Valve Control Circuit High Voltage Test Status parameter is Malfunction when commanding the Intake Manifold Tuning Control Valve Open with a scan tool.
• If Malfunction is not displayed
1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.
2. Test for less than 2 ohms in the control circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K20 Engine Control Module.
• If Malfunction is displayed
8. Replace the Intake Manifold.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
Intake Manifold Replacement
Control Module References Control Module References for replacement, programming, and setup.