P0016

DTC P0016

CIRCUIT DESCRIPTION
The crankshaft position (CKP) sensor is located on top of the flywheel housing. There are 56 notches spaced 6° apart and a 24° section that is uncut. This uncut portion allows for the detection of cylinder #1 top dead center (TDC).

The camshaft position (CMP) sensor is installed on the cylinder head at the rear of the camshaft gear. The CMP sensor detects a total of five through holes (four holes arranged equally every 90° and one reference hole on the camshaft gear flange surface).

Detecting the uncut portion from the CKP sensor and one reference hole from the CMP sensor, the engine control module (ECM) determines cylinder #1 compression top dead center (TDC) to ensure they correlate with each other. If the ECM detects both signals are out of synchronization, this DTC will set.

Condition for Running the DTC
- DTCs P0116, P0117, P0118, P0335, P0336, P0340 and P0341 are not set.
- The ignition switch is ON.
- The battery voltage is between 10-16 volts.
- The engine speed is lower than 4000 RPM.
- The CKP sensor signal is detected.
- The CMP sensor signal is detected.

Condition for Setting the DTC
- The ECM detects that the CKP sensor signals and CMP sensor signals are out of synchronization during 5 engine rotations.

Action Taken When the DTC Sets
- The ECM illuminates the malfunction indicator lamp (MIL) on the second consecutive driving cycle when the diagnostic runs and fails.
- The ECM records the operating conditions at the time the diagnostic fails. The ECM stores this information in the Freeze Frame/Failure Records on the second consecutive driving cycle when the diagnostic runs and fails.

Condition for Clearing the MIL/DTC
- The ECM turns OFF the MIL after 3 consecutive driving cycles when 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 after the ECM turns OFF the MIL.
- Clear the MIL and the DTC with a scan tool.

Diagnostic Aids
- This DTC is caused by an incorrect mechanical timing condition, which was most likely cased by wrong installation of timing gear, flywheel or camshaft.

DTC P0016

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