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", the CKP "B", and the CMP is shorted to a ground. If all 3 DTCs are set, 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 P0336 indicates an intermittent loss of the CKP "A" sensor signal while in Time "A" mode. DTC P0336 only sets after the PCM detects a loss of the CKP "B" sensor signal and has switched to Time "A" mode. 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 the CKP "A" sensor signal, the PCM switches to a Time "B" mode using the CKP "B" sensor input in order to determine the engine position. If the PCM detects a loss of the CKP "B" sensor signal, the PCM switches to a Time "A" mode using the CKP "A" sensor input in order to determine the engine position.
3. 4
   
   During engine operation, if moving the harnesses and connectors that are related to CKP "B" sensor results in a switch to Time "A" mode may also causes an engine stall condition, an intermittent condition in the harnesses or in the connectors is present. If the harnesses and the connectors are okay, CKP "B" sensor may be the cause of the intermittent condition.
4. 7
   
   In order to test the CKP "B" sensor signal circuit, the PCM must be commanded to Time "B" mode using the scan tool. This allows the PCM to monitor the input signals from CKP "B" sensor. 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.