Pinpoint Test 5: No Controller Area Network (CAN) Communication

PINPOINT TEST 5: NO CONTROLLER AREA NETWORK (CAN) COMMUNICATION

Step 1:

Step 2-Step 6:

Step 7-Step 11:

Step 12-Step 15:

Step 16-Step 19:

Step 20-Step 22:

Step 23-Step 26:

Step 27:

Chart 1:

Chart 2:

Normal Operation
The PCM communicates with the scan tool through the high speed controller area network (HS-CAN). Circuits (W/L) (HS-CAN +) and (W) (HS-CAN -) provide the network connection to the PCM. The PCM shares the HS-CAN with the four wheel drive (4WD) control module, the restraints control module (RCM), the occupant classification sensor module, the smart junction box (SJB), and the instrument cluster. Circuits (V/W) and (GY/R) provide voltage, and redundant circuit (B/V) provides ground.

Possible Causes
- Fuse
- Circuit (V/W) open
- Circuit (GY/R) open
- Circuit (B/V) open
- CAN data plus circuit (W/L) open, short to ground, or short to voltage
- CAN data minus circuit (W) open, short to ground, or short to voltage
- CAN data plus circuit (W/L) and CAN data minus circuit (W) shorted together
- DLC D-01
- PCM
- RCM
- Occupant classification sensor module
- Instrument cluster
- SJB

CAUTION: Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connector.