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-A2:

A2-A4:

A5-A8:

A8-A10:

A10-A12:

A12-A14:

A14-A16:

A16-A18:

A18-A20:

A21-A24:

Normal Operation
The PCM communicates with the scan tool through the high speed controller area network (HS-CAN). Circuits 4-EC7 (GY/RD) (HS-CAN +) and 5-EC7 (BU/RD) provide the network connection to the PCM. The PCM shares the HS-CAN with the anti-lock brake system (ABS) module, the restraints control module (RCM), the occupant classification sensor module, and the instrument cluster. Circuit 30-RE8 (RD) provides voltage, and redundant circuits 91-RE8 (BK/YE) provide ground.

Possible Causes
- Fuse
- Circuit 30-RE8 (RD) open
- Circuit 91-RE8 (BK/YE) open
- Circuit 4-EC7 (GY/RD) open, short to ground or voltage (HS-CAN +)
- Circuit 5-EC7 (BU/RD) open, short to ground or voltage (HS-CAN -)
- Circuit 4-EC7 (GY/RD) (HS-CAN +) and circuit 5-EC7 (BU/RD) (HS-CAN -) shorted together
- PCM
- ABS module
- RCM
- Occupant classification sensor module
- Instrument cluster.