Engine Top End

[06T200]

Here is the scoop from TIS on the IMT contraptions:

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.

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


Here is the connector diagram for IMT pos sensor.




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 3 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.


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


4. Verify the scan tool IMT valve position sensor percentage parameter is less than 5 percent.



5. Install a 3A fused jumper wire between the signal circuit terminal 2 and the 5-volt reference circuit terminal 1. Verify the scan tool IMT valve position sensor percentage parameter is greater than 95 percent.



6. If all circuits/connections test normal, replace the IMT valve position sensor.