P0016
DTC P0016
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 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.
DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC P0016 Crankshaft Position (CKP) - Camshaft Position (CMP) Correlation
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 CKP sensor pulse.
ACTION TAKEN WHEN THE DTC SETS
- The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
- 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
- The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
- A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
- Clear the MIL and the DTC with a scan tool.
DIAGNOSTIC AIDS
Inspect for the following items:
- A loose or missing distributor hold down bolt
- A loose CMP sensor causing a variance in the sensor signal
- An incorrectly installed distributor-One tooth off in either Advance or Retard positions
- A loose distributor rotor on the distributor shaft
- Excessive free play in the timing chain and gear assembly
If an intermittent condition is suspected, refer to Intermittent Conditions. Intermittent Conditions
TEST
