Test E

PINPOINT TEST E: NO POWERTRAIN CONTROL MODULE (PCM) STANDARD CORPORATE PROTOCOL (SCP) NETWORK COMMUNICATION

Test E1-E3:

Normal Operation
The PCM communicates with the modules through the standard corporate protocol (SCP) communications network. Circuits 4-RE8 (GY) and 5-RE8 (BU) receive and transmit data from the PCM to the modules. Degraded SCP performance occurs if one bus line is open, shorted to ground or voltage, or if one but not all termination resistors are lost.

Possible Causes
- circuits 4-RE8 (GY) and/or 5-RE8 (BU) shorted to ground or open
- PCM C175a
- DLC C251
- PCM