The engine control module (ECM) uses the crankshaft position (CKP) sensor and the intake and exhaust camshaft position (CMP) sensor information to monitor the correlation between the crankshaft, intake, and exhaust camshaft position.

The ECM detects that the CMP sensor pulses occur less than 9 or more than 12 crankshaft degrees outside of the normal position for 24 out of 30 engine cycles.

DTCs P0016 and P0017 are Type B DTCs.

DTCs P0016 and P0017 are Type B DTCs.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

Important: The scan tool control of the CMP actuator is inhibited when DTC P0016 or P0017 sets.

1. Operate the vehicle at idle and at various engine speeds and load ranges while observing the CMP Variance, Desired CMP, and CMP Angle parameters with a scan tool.
2. The CMP variance should remain less than or equal to 1 degree unless the CMP actuator is being commanded. If the CMP actuator is commanded, the CMP variance will rise for 1-2 seconds until the CMP Angle parameter matches the Desired CMP parameter. The CMP variance should again return to less than or equal to 1 degree.

⇒	If the CMP variance remains more than 1 degree for more than 3 seconds, continue with the Circuit/System Testing.

Important: Incorrect engine oil viscosity, aftermarket engine oil additives, or engine oil that is overdue for changing, can greatly affect the performance of the camshaft actuator.

1. Ignition OFF, inspect the crankshaft balancer bolt for the proper torque. Refer to Fastener Tightening Specifications.
2. Remove the CMP actuator solenoid. Refer to Camshaft Position Actuator Solenoid Valve Replacement.
3. Connect a fused jumper wire between the CMP actuator high control circuit at the solenoid and B+. Connect a jumper wire to the CMP actuator low reference circuit at the solenoid. Momentarily touch the jumper wire to ground. Observe the spool valve inside the CMP actuator. The spool valve should move from fully closed to fully opened position.

⇒	If the spool valve inside the CMP actuator solenoid does not move, replace the CMP actuator solenoid.

4. Inspect the CMP actuator for binding or being stuck.
5. Inspect the engine for the following conditions:

•	An incorrectly installed camshaft sensor

•	An incorrectly installed crankshaft sensor

•	An incorrectly installed camshaft actuator

•	Incorrect valve timing

•	A loose camshaft reluctor wheel

•	A loose crankshaft reluctor wheel

•	Excessive crankshaft end play

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.