Description: Crankshaft Position - Camshaft Position Correlation

Troubleshooting:
CIRCUIT DESCRIPTION:
The powertrain control module (PCM) supplies a 12-volt reference circuit and a low reference
circuit to both the crankshaft position (CKP) sensor and the camshaft position (CMP) sensor.
The CKP sensor sends a signal to the PCM with each revolution of the crankshaft. The CMP
sensor sends a signal to the PCM with each revolution of the camshaft. This diagnostic trouble
code (DTC) monitors the CKP signal and the CMP signal to determine if they are synchronized.
If both signals are not observed by the PCM within a narrow period of time, the PCM will
determine that an error has occurred and DTC P0016 will set.

CONDITIONS FOR RUNNING THE DTC:
The engine is running.

CONDITIONS FOR SETTING THE DTC:
When the engine is running, the cam sensor pulse is not detected at the correct relative
position to the crankshaft position sensor pulse.

ACTION TAKEN WHEN THE DTC SETS:
1. The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic
runs and fails.
2. The control module records the operating conditions at the time the diagnostic fails. The
control module stores this information in the Freeze Frame/Failure Records.

CONDITIONS FOR CLEARING THE MIL/DTC:
1. The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive
ignition cycles that the diagnostic runs and does not fail.
2. A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
3. A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this
or any other emission related diagnostic.
4. Clear the MIL and the DTC with a diagnostic tool.

DIAGNOSTIC AIDS:
Check for the following items:
1. A loose or missing distributor hold down bolt
2. A loose CMP sensor causing a variance in the sensor signal
3. An incorrectly installed distributor - 1 tooth off in either advance or retard positions
4. A loose distributor rotor on the distributor shaft
5. Excessive free play in the timing chain and gear assembly
If an intermittent condition is suspected, refer to Intermittent Conditions.