Test Description

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

1. 2
   
   This step determines if the 12-volt reference circuit to the CKP "A", CKP "B", and the CMP is shorted to a ground. If all 3 DTCs are set, this indicates the circuit is shorted to a ground or a sensor is internally shorted. All 3 DTCs set because the 12-volt reference circuits are internally connected within the PCM. The engine will not start with this condition.
2. 3
   
   DTC P0386 indicates an intermittent loss of CKP sensor "B" signal while in Time "B" mode. DTC P0386 only sets after the PCM detects a loss of CKP sensor "A" signal and has switched to Time "B" mode. 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.
3. 4
   
   During engine operation, if moving the harnesses and connectors related to CKP sensor "A" results in a switch to Time "B" mode, may also cause an engine stall condition, an intermittent condition in the harnesses or connectors is present. If the harnesses and connectors are okay, CKP sensor "A" may be the cause of the intermittent condition.
4. 7
   
   In order to test the CKP sensor "A" signal circuit, the PCM must be commanded to Time "A" mode using the scan tool. This allows the PCM to monitor input signals from CKP sensor "A". For procedure to select the Crank Decode Mode, see PROCEDURES FOR SELECTING CRANK POSITION SENSING DECODE MODE .
5. 11
   
   This step determines if the CMP sensor is shorted internally. If the 12-VOLT REFERENCE parameter changes from Fault to OK, the condition is with the sensor.
6. 12
   
   This step determines if the CKP "A" sensor is shorted internally. If the 12-VOLT REFERENCE parameter changes from Fault to OK, the condition is with the sensor.
7. 13
   
   This step determines if the CKP "B" sensor is shorted internally. If the 12-VOLT REFERENCE parameter changes from Fault to OK, the condition is with the sensor.