The engine control module (ECM) uses the crankshaft position (CKP) sensor pulses to monitor the crankshaft position. The crankshaft reluctor wheel consists of a 60-tooth pattern with 2 teeth missing for the reference gap. Each tooth is evenly spaced 6 degrees apart, except for the reference gap. The camshaft sensor (CMP) reluctor wheel has 4 teeth, 2 narrow and 2 wide. The 4 trailing edges of each tooth are evenly spaced at 90 degrees apart around the circumference of the camshaft sprocket. With the engine running the ECM expects the camshaft signal pulses to occur 36 crankshaft degrees before top dead centre (BTDC) for cylinder number 1 and every 180 degrees thereafter.

The ECM detects that the CMP sensor pulses occur less than or more than 10 crankshaft degrees outside of the normal position for 25 out of 35 engine cycles.

DTC P0016 is a type B DTC.

DTC P0016 is a type B DTC.

Schematic Reference

Engine Controls Schematics .

Connector End View Reference

Component Connector End Views

Electrical Information Reference

Scan Tool Reference

Control Module References

Important: If the vehicle passes the Circuit/System Verification Test, then operate the vehicle within the Conditions For Running The DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records Data List. The other option is to refer to Testing for Intermittent Conditions and Poor Connections .

1. Operate the vehicle at idle and at various engine speeds and load ranges while observing the CMP Variance compared to the desired CMP and CKP angle parameters with a scan tool.
2. Both parameters should remain less than or equal to 1 degree at all engine speeds. The CMP variance should remain 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.

1. Inspect the engine front cover area or review the service history of the vehicle for any recent repairs involving the timing chain, camshaft, crankshaft or sprockets.

⇒	If recent repairs were made refer to Timing Chain and Sprocket Removal and inspect the timing chain and both sprockets for proper timing alignment or indexing.

2. Remove the engine front cover. Refer to Engine Front Cover Replacement . Inspect the timing chain, tensioner and sprockets for wear or damage. Refer to Camshaft Timing Chain and Sprocket Cleaning and Inspection .

⇒	If the all the components test normal, replace the appropriate sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Camshaft Timing Chain and Sprocket Replacement .