Each camshaft is equipped with a camshaft position sensor that the engine control module (ECM) monitors. The camshaft position 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 camshaft position sensor signals in order to determine the position of the camshafts. The ECM supplies 5 V to the camshaft position sensors on the 5-volt reference circuits, and supplies a ground on the low reference circuits. The camshaft position sensors provide a signal to the ECM on the signal circuits.

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

DTCs P03401 00, and P0366 00 are Type B DTCs.

A high resistance condition on the camshaft position sensor circuits may cause a DTC to set.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

LINK (Camshaft Actuator System Description)

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for diagnostic tester information

1. Ignition ON, observe the DTC information with a scan tool. DTC P0641 00 should not be set.

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

2. Engine idling, observe the scan tool Camshaft Position Active Counter parameter. The parameters should be incrementing.
3. Engine idling, observe the DTC information with a scan tool. DTC P0341 00 or P0366 00 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 B23F Camshaft Position (CMP) Sensor - Intake or B23E Camshaft Position (CMP) Sensor - Exhaust sensor while monitoring the scan tool Intake Camshaft Position Variance or Exhaust Camshaft Position Variance parameter. The Intake Camshaft Position Variance or Exhaust Camshaft Position 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 B23F Camshaft Position (CMP) Sensor - Intake or B23E Camshaft Position (CMP) Sensor - Exhaust sensor for correct installation.

⇒	If the B23F Camshaft Position (CMP) Sensor - Intake or B23E Camshaft Position (CMP) Sensor - Exhaust sensor is loose, inspect the sensor and the O-ring for damage, and replace as necessary.

3. Disconnect the harness connector at the appropriate B23F Camshaft Position (CMP) Sensor - Intake or B23E Camshaft Position (CMP) Sensor - Exhaust sensor.
4. Ignition OFF for 1 m, 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 K20 Engine Control Module (ECM).

5. Ignition ON, test for 4.8 to 5.2 V between the 5-volt reference circuit terminal 3 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 K20 Engine Control Module (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 K20 Engine Control Module (ECM).

6. Test for 4.8 to 5.2 V between the signal circuit terminal 1 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 K20 Engine Control Module (ECM).

⇒	If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module (ECM).

7. Ignition OFF, connect a 3 A fused jumper wire to the B23F Camshaft Position (CMP) Sensor - Intake or B23E Camshaft Position (CMP) Sensor - Exhaust signal circuit terminal 1.
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.

•	Physical damage to the B23F Camshaft Position (CMP) Sensor - Intake or B23E Camshaft Position (CMP) Sensor - Exhaust sensor or the reluctor wheel

•	Excessive play or looseness of the B23F Camshaft Position (CMP) Sensor - Intake or B23E Camshaft Position (CMP) Sensor - Exhaust sensor or the reluctor wheel

•	Excessive camshaft end play

•	Improper installation of the B23F Camshaft Position (CMP) Sensor - Intake or B23E Camshaft Position (CMP) Sensor - Exhaust sensor or the reluctor wheel

•	Foreign material passing between the B23F Camshaft Position (CMP) Sensor - Intake or B23E Camshaft Position (CMP) Sensor - Exhaust sensor and the reluctor wheel

•	The timing belt and tensioner for wear or damage

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

9. If all circuits test normal, replace the B23F Camshaft Position (CMP) Sensor - Intake or B23E Camshaft Position (CMP) Sensor - Exhaust sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.