Test Description

The numbers below refer to the step numbers in the diagnostic procedures.

1. 2
   
   During normal operation, the PCM uses the Angle Mode in order to determine the engine position. In order to operate in this mode, the PCM must receive valid input from both CKP sensors. If the PCM detects a loss of CKP "A" sensor signal, the PCM switches to a Time "B" mode using CKP "B" sensor input in order to determine the engine position. If the PCM detects a loss of CKP "B" sensor, the PCM switches to a Time "A" mode using CKP "A" sensor input in order to determine the engine position. If the PCM detects a loss of the CKP "B" sensor signal, DTC P0385 will set. DTC P0336 will only set if a problem with CKP "A" sensor occurs during Time "A" mode. DTC P0385 must be diagnosed first. See DTC P0385: CRANKSHAFT POSITION SENSOR "B" CIRCUIT .
2. 6
   
   In order to properly verify any repair to CKP "A" sensor harnesses or connectors, the system must be commanded to operate in Time "A" mode. This procedure forces the PCM to use CKP "A" sensor in order to determine the engine position. If the system is functioning normally, DTC P0336 should not reset.