Test A: The Powertrain Control Module (PCM) Does Not Respond To the Scan Tool, or No High Speed Controller Area Network (HS-CAN

PINPOINT TEST A: THE POWERTRAIN CONTROL MODULE (PCM) DOES NOT RESPOND TO THE SCAN TOOL, OR NO HIGH SPEED CONTROLLER AREA NETWORK (HS-CAN) COMMUNICATION

A1:

A1-A2:

A3-A4:

A5-A8:

A8-A10:

A10-A12:

A12-A14:

A14-A16:

A16-A18:

A18-A20:

A20-A22:

A23-A27:

Normal Operation
The PCM communicates with the scan tool through the high speed controller area network (HS-CAN). Circuits VDB04 (WH/BU) (HS-CAN +) and VDB05 (WH) (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 CBB39 (VT/WH) and SBB21 (GY/RD) provide voltage, and redundant circuit GD108 (BK/VT) provides ground.

Possible Causes
- Fuse
- Circuit CBB39 (VT/WH) open
- Circuit SBB21 (GY/RD) open
- Circuit GD108 (BK/VT) open
- Circuit VDB04 (WH/BU) open, short to ground or voltage (HS-CAN +)
- Circuit VDB05 (WH) open, short to ground or voltage (HS-CAN -)
- Circuit VDB04 (WH/BU) (HS-CAN +) and circuit VDB05 (WH) (HS-CAN -) shorted together
- PCM
- RCM
- Occupant classification sensor module
- 4WD control module
- Instrument cluster
- SJB