Disconnect the sensor harness AMP connector from the electronic control module (ECM).

Remove the retaining clamp of the sensor harness from the rear of the engine block.

Disconnect the sensor harness from the intake air temperature sensor and the intake manifold pressure sensor.

On engines equipped with engine brakes, disconnect the engine brake harness from the sensor wiring harness.

Remove the harness retaining capscrews and disconnect the harness from the following sensors:

• Oil pressure sensor
• Ambient air pressure*
• Engine position sensor
• Engine coolant temperature sensor.

* Not used on all ratings.