For 1990-2009 cars

### Diagnostic Instructions

• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• | Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• | Diagnostic Procedure Instructions provides an overview of each diagnostic category.

### DTC Descriptors

DTC P0016: Crankshaft Position (CKP) - Intake Camshaft Position (CMP) Correlation
DTC P0017: Crankshaft Position (CKP) - Exhaust Camshaft Position (CMP) Correlation

### Circuit/System Description

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.

### Conditions for Running the DTC

• | DTCs P0335, P0336, P0340, P0341, P0365, P0366, P0641, and P0651 are not set.

• | The engine is cranking or running.

• | The engine speed is less than 1,200 RPM and the CMP actuator is commanded to the home or parked position.

• | These DTCs run continuously when the above conditions are met.

### Conditions for Setting the DTC

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.

### Action Taken When the DTC Sets

DTCs P0016 and P0017 are Type B DTCs.

### Conditions for Clearing the MIL/DTC

DTCs P0016 and P0017 are Type B DTCs.

### Reference Information

#### Schematic Reference

Engine Controls Schematics

#### Connector End View Reference

Component Connector End Views

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Verification

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.

### 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

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Camshaft Position Actuator Solenoid Valve Replacement

• | Camshaft Position Exhaust Actuator Replacement

• | Camshaft Position Intake Actuator Replacement

• | Camshaft Position Sensor Replacement - Exhaust

• | Camshaft Position Sensor Replacement - Intake

• | Camshaft Timing Chain, Sprocket, and Tensioner Replacement

• | Crankshaft and Bearing Cleaning and Inspection

• | Crankshaft Balancer Replacement

• | Crankshaft Position Sensor Replacement

• | Exhaust Camshaft and Valve Lifter Replacement

• | Intake Camshaft and Valve Lifter Replacement