DTC P065E Setting - keywords ECM ECU IMT inoperative intake intermittent manifold MIL MS77 position sensor valve

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

A technician may find an engine control module DTC of P065E. The following diagnostic information may help.

Use the Tech2 to command the Intake Manifold Tuning (IMT) valve solenoid to ON while observing that the diaphragm arm moves. NOTE: (The IMT valve can only be commanded to move if there is enough vacuum present in the system to operate the actuator.) If insufficient vacuum is available, the engine can started for a brief period. Once valve operation has been confirmed, monitor the Tech2 data list 2 for the IMT valve position sensor. The Tech2 data should change from Inactive to Active as the valve moves. The valve can be manually operated by rotating the linkage to check for binding or to verify the change of state on the TECH2. The valve uses a 3-wire position sensor located just below the throttle body. Do not confuse the unused connector just above the IMT actuator on the driver's side of the vehicle as the location of the sensor and magnets. It may appear that the magnets and sensor are missing when looking at the valve from the driver's side. This connector does not have any wires attached or magnets present and is not used for the GMNA market.

Quick Test for IMT sensor operation.

If the valve is verified as moving and the IMT sensor is the suspected component, the entire system can be quickly checked. Remove the sensor (located just below the throttle body on the intake) and pass a magnet across the sensor while monitoring the IMT position with Tech2. The sensor is a Hall Effect type sensor. If the Tech2 data changes from Inactive to Active as the magnet moves across the sensor pickup, the wiring, sensor and ECM are operating as designed. If no change is noted the IMT sensor can be swapped off another vehicle to verify.

Quick test to make sure the IMT valve position magnets are in place.

To make sure the magnets are installed in the end of the IMT valve, remove IMT sensor from intake manifold and insert a large metal paper clip into the slot the sensor rides. In the rest position the first magnet on the IMT valve should hold the paper clip in place. Then manually rotate the IMT valve. The paper clip will be released by the first magnet and you will see the clip fall slightly. Continue to rotate valve; when the IMT valve reaches its stop the second magnet should then hold the paper clip again, causing it to rise slightly and stick to manifold.

Note: Current stock of the intake manifold is bad and had been purged from SPO. (As of 9-5-08) If a tech has ordered and received a manifold before 9-5-08 the part should be considered suspect. This PI will be updated when service parts are available through Saturn SPO. The IMT valve and sensor are only available with the manifold assembly at this time. An updated design IMT valve position sensor is in production and can be found by inspecting the IMT sensor for 2 white dots on the side. The IMT sensor harness connector should be removed to see the dots.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.