Test Description

WARNING: This page is about a different car, the 2003 Cadillac Seville and 2003 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.

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

2

During normal operation, the PCM uses the angle mode in order to determine 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 sensor "A" signal, the PCM switches to a Time"B" mode using CKP sensor "B" input in order to determine engine position. If the PCM detects a loss of CKP sensor "B", the PCM switches to a Time "A" mode using CKP sensor "A" input to determine engine position. If the PCM detects a loss of CKP sensor "B" signal, DTC P0385 will set. DTC P0336 will only set if a problem with CKP sensor "A" occurs while in Time "A" mode. DTC P0385 must be diagnosed first.

6

To properly verify any repair to CKP sensor "A" harness connectors, the system must be commanded to operate in Time "A" mode. This forces the PCM to use CKP sensor "A" in order to determine engine position. If the system is functioning normally, DTC P0336 should not reset.