Pinpoint Test 1: The PCM Does Not Respond to the Scan Tool or No High Speed Controller Area Network (Hs-CAN) Communication

PINPOINT TEST 1: THE PCM DOES NOT RESPOND TO THE SCAN TOOL OR NO HIGH SPEED CONTROLLER AREA NETWORK (HS-CAN) COMMUNICATION

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 network with the ABS module, the four wheel drive (4WD) control module, restraints control module (RCM), occupant classification sensor module, power steering control module and the instrument cluster. Voltage for the PCM is provided by circuits (GY/V) and (GY/R). Circuit (B) provides ground.

Possible Causes
- Fuse
- Wiring, terminals or connectors
- ABS module
- 4WD control module (if equipped)
- Instrument cluster
- PCM
- RCM
- Power steering control module
- Occupant classification sensor module

Diagnostic Procedure

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

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