Each camshaft is equipped with a camshaft position (CMP) sensor that the engine control module (ECM) monitors. The CMP sensor is a hall effect switch that works in conjunction with a 4X reluctor wheel. The reluctor wheels are mounted to the camshaft position actuators that are mounted to the end of the camshafts. The ECM uses the CMP sensor signals in order to determine the position of the camshafts. The ECM supplies 5 volts to the CMP sensors on the 5-volt reference circuits, and supplies a ground on the low reference circuits. The CMP sensors provide a signal to the ECM on the signal circuits.

The ECM detects a signal from the CMP sensor, but the number of pulses are less than or greater than what is expected for one crankshaft revolution.

DTCs P0341 and P0366 are Type B DTCs.

A high resistance condition on the CMP sensor circuits could cause a DTC to set.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Camshaft Actuator System Description

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON, observe the DTC information with a scan tool. DTC P0641 should not be set.

⇒	If DTC P0641 is set, refer to DTC P0641, P0651, P0697, or P06A3.

2. Engine idling, observe the scan tool Intake and Exhaust CMP Active Counter parameters. Both parameters should be incrementing.
3. Engine idling, observe the DTC information with a scan tool. DTC P0341 or P0366 should not set.
4. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

1. Engine idling, move the related harnesses/connectors of the appropriate CMP sensor while monitoring the scan tool CMP Variance parameter. The CMP variance parameter should not change when moving the harness/connectors.

⇒	If the above condition exists, repair the harness/connectors as necessary.

2. Ignition OFF, inspect the appropriate CMP sensor for correct installation.

⇒	If the CMP sensor is loose, inspect the sensor and the O-ring for damage, and replace as necessary.

3. Disconnect the harness connector at the appropriate CMP sensor.
4. Ignition OFF for 1 minute, test for less than 5 Ω between the low reference circuit terminal 2 and ground.

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

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

⇒	If less than the specified range, test the 5-volt reference circuit for a short to ground, or an open/high resistance. If the circuit tests normal, replace the ECM.

⇒	If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.

6. Test for 4.8-5.2 V between the signal circuit terminal 3 and ground.

⇒	If less than the specified range, test the signal circuit for a short to ground, or an open/high resistance. If the circuit tests normal, replace the ECM.

⇒	If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.

7. Ignition OFF, connect a 3 A fused jumper wire to the CMP signal circuit terminal 3.
8. Ignition ON, momentarily touch the end of the fused jumper wire to ground while monitoring the scan tool CMP active counter. The CMP active counter should increment.

⇒	If the CMP active counter does not increment, replace the ECM.

9. Inspect the engine for the following conditions:

•	Physical damage to the CMP sensor or the reluctor wheel

•	Excessive play or looseness of the CMP sensor or the reluctor wheel

•	Excessive camshaft end play

•	Improper installation of the CMP sensor or the reluctor wheel

•	Foreign material passing between the CMP sensor and the reluctor wheel

•	Excessive air gap between the CMP sensor and the reluctor wheel

•	The timing belt and tensioner for wear or damage

⇒	If any of the above conditions exists, repair as necessary.

10. If all circuits test normal, replace the CMP sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.