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P2076



DTC P2076

DTC DESCRIPTORS

DTC P2076
Intake Manifold Tuning (IMT) Valve Position Sensor Performance

DTC P2077
Intake Manifold Tuning (IMT) Valve Position Sensor Circuit Low Voltage

DTC P2078
Intake Manifold Tuning (IMT) Valve Position Sensor Circuit High Voltage

DIAGNOSTIC FAULT INFORMATION




Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Testing and Inspection

CIRCUIT/SYSTEM DESCRIPTION
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.

CONDITIONS FOR RUNNING THE DTC

P2076
- DTC P0660 is not set.
- The engine is operating for greater than 1 second.
- The intake air temperature is greater than 15°C (59°F).
- The manifold absolute pressure (MAP) is less than 30 kPa for 6 seconds.
- The IMT valve is enabled for greater than 1 second.
- The DTC runs continuously once the above conditions are met.

P2077 or P2078
- DTC P0660 is not set.
- The engine is operating for greater than 5 seconds.
- The DTCs run continuously once the above condition is met.

CONDITIONS FOR SETTING THE DTC

P2076
The ECM detects a difference between the actual IMT position and the desired IMT position.

P2077
The ECM detects that the IMT valve position sensor is less than 0.3 volt for 5 seconds.

P2078
The ECM detects that the IMT valve position sensor is greater than 4.8 volts for 5 seconds.

ACTION TAKEN WHEN THE DTC SETS
- DTC P2076 is a Type B DTC.
- DTCs P2077 and P2078 are Type A DTCs.

CONDITIONS FOR CLEARING THE DTC
- DTC P2076 is a Type B DTC.
- DTCs P2077 and P2078 are Type A DTCs.

CIRCUIT/SYSTEM VERIFICATION
1. 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 (IMT) Valve Diagnosis for further diagnosis. Intake Manifold Tuning (IMT) Valve Diagnosis
2. Engine idling, observe the DTC information with a scan tool. DTCs P0660, P2076, P2077, and P2078 should not set.
- If DTC P0660 is set, refer to DTC P0660 for further diagnosis. P0660
3. 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 List.

CIRCUIT/SYSTEM TESTING
1. Ignition OFF, disconnect the harness connector of the IMT valve position sensor.
2. Ignition OFF, test for less than 5 ohms of resistance between the low reference circuit terminal 2 and ground.
- If greater than 5 ohms, test the low reference circuit for a short to voltage, or an open/high resistance. If the circuit/connections test normal, replace the ECM.

IMPORTANT: If the circuit is shorted to a voltage, the low reference circuit within the ECM may open and the ECM will also need to be replaced.

3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 1 and ground.

IMPORTANT: The 5-volt reference circuits are internally and externally connected at the ECM. Other component DTCs may be set. If other DTCs are set, review the electrical schematic and diagnose the applicable circuits and components.

- If less than 4.8 volts, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit/connections test normal, replace the ECM.
- If greater than 5.2 volts, test the 5-volt reference circuit for a short to voltage. If the circuit/connections test normal, replace the ECM.
4. Verify the scan tool IMT valve position sensor voltage parameter is less than 0.3 volt.
- If greater than 0.3 volt, test the signal circuit for a short to voltage. If the circuit/connections test normal, replace the ECM.
5. Install a 3-amp fused jumper wire between the signal circuit terminal 3 and the 5-volt reference circuit terminal 1. Verify the scan tool IMT valve position sensor voltage parameter is greater than 4.8 volts.
- If less than 4.8 volts, test the signal circuit for a short to ground or an open/high resistance. If the circuit/connections test normal, replace the ECM.
6. If all circuits/connections test normal, replace the IMT valve position sensor.

REPAIR INSTRUCTIONS
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
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