Advanced Diagnostics

DTC P15B1: Camshaft Position (CMP) Sensor/Crankshaft Position (CKP) Sensor Signal Incorrect (Engine Type: J35Z1)







General Description
The engine mount control system controls the engine mount electronically. The system consists of the active control engine mount (ACM) actuators, the engine mount control unit, and the powertrain control module (PCM).

The engine mount control unit uses the crankshaft and camshaft position sensor outputs (received from the PCM) to estimate engine vibration. The engine mount control unit then sends signals to the ACM actuators to command the engine mounts to push and pull on the engine to counteract the engine vibration.

The camshaft position (CMP) sensor is triggered by three raised points on the camshaft pulley. Two of the points are positioned 60 degrees apart, with the third point 120 degrees (clockwise) from the second point. (Compared to a clock, the points are at the 12, 2, and 6 o'clock positions.) When the engine is running, there is a certain number of crankshaft position (CKP) sensor A signals between each camshaft position (CMP) sensor signal.

If the number of signals from crankshaft position (CKP) sensor A do not correspond with the camshaft position (CMP) sensor signals, a malfunction is detected and a DTC is stored.




Monitor Execution, Sequence, Duration, DTC Type, OBD Status




Enable Conditions

Malfunction Threshold
In relation to the CMP sensor pulses, the CKP1 sensor pulse pattern is abnormal for at least 2.6 seconds. The normal repeating CKP1 sensor pulse pattern is 7, 15, 22 (one revolution), 7, 15, 22 (another revolution), etc.

Diagnosis Details

Conditions for illuminating the indicator
When a malfunction is detected, the DTC and the freeze frame data are stored in the PCM memory. The MIL does not come on.

Conditions for clearing the DTC
The DTC and the freeze frame data can be cleared by using the scan tool Clear command or by disconnecting the battery.