The engine control module (ECM) supplies the intake manifold tuning (IMT) valve position sensor with a 5-volt reference circuit, a low reference circuit, and a signal circuit. The IMT valve position sensor provides a signal voltage that changes relative to the IMT valve angle. The ECM can determine if the IMT valve is stuck open, or stuck closed by monitoring the voltage on the signal circuit of the IMT valve position sensor.

P2070

The ECM detects that the IMT valve is stuck open.

P2071

The ECM detects that the IMT valve is stuck closed.

DTCs P2070 and P2071 are Type B DTCs.

DTCs P2070 and P2071 are Type B DTCs.

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

Special Tools Required

J 23738-A Hand Vacuum Pump

1. Ignition ON, observe the DTC information with a scan tool. Verify DTC P0642 or P0643 are not set.

⇒	If DTC DTC P0642 or P0643 are set, refer to DTC P0642, P0643, P0698, or P0699 .

2. Engine idling, command the IMT valve ON with a scan tool and observe the IMT valve vacuum actuator moves to the closed position.

⇒	If the IMT valve vacuum actuator is inoperative, refer to Intake Manifold Tuning Valve Diagnosis for further diagnosis.

3. Engine idling, observe the DTC information with a scan tool. DTCs P0660, P0661, P0662, P2077, and P2078 should not set.

⇒	If DTCs P0660, P0661, P0662, P2077, and P2078 are set, refer to DTC P0660, P0661, or P0662 and DTC P2077 or P2078 for further diagnosis.

4. Engine idling, verify the scan tool IMT position sensor voltage parameter is within 0.90 to 1.00 volt.
5. 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.

1. Ignition OFF, disconnect the harness connector at the intake manifold tuning (IMT) position sensor.
2. Ignition OFF for at least 20 seconds, test for less than 5 ohms of resistance between the low reference circuit and ground.

⇒	If greater than the specified range, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.

3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit and ground.

⇒	If less than the specified range, test the 5-volt reference circuit for a high resistance. If the circuit tests normal, replace the ECM.

4. Install a 3-A fused jumper wire between the signal circuit and the 5-volt reference circuit. Verify the scan tool IMT valve position sensor voltage parameter is greater than 4.8 volts.

⇒	If less than the specified range, test the signal circuit for high resistance. If the circuit tests normal, replace the ECM.

Important: Perform the Learn IMT Valve Adapts procedure when replacing the IMT valve position sensor.

5. If all circuits test normal, replace the IMT valve position sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.