No Response From PCM (PCI Bus)

Possible Causes:

Testing

NOTE: As soon as one or more module communicates with the DRBIII(R), answer the question

Turn the ignition on. With the DRBIII(R), enter Body then Body Computer. With the DRBIII(R), enter Anti-Lock Brakes. With the DRBIII(R), enter Body then Electro/Mlechanical Cluster (MIC). With the DRBIII(R), enter Passive Restraints then Airbag. Were you able to establish communications with any of the modules? If yes, go to next step. If no, refer to COMMUNICATION in SYMPTOM IDENTIFICATION table for PCI Bus Communication Failure. Perform POWERTRAIN VERIFICATION TEST VER-1 .

NOTE: If the DRBIII(R) will not read PCM DTC's, follow the NO RESPONSE TO PCM (SCI only) symptom path.

With the DRBIII(R), read PCM Diagnostic Trouble Codes. This is to ensure power and grounds to the PCM are operational. Turn the ignition Off. Disconnect the PCM harness connector. Use Scope Input Cable (CH7058), Cable-to-Probe Adapter (CH7062), and the red and black test probes. Connect the scope input cable to the channel one connector on the DRBIII(R). Attach the red and black leads and the cable to probe adapter to the scope input cable. With the DRBIII(R) select Pep Module Tools. Select lab scope. Select Live Data. Select 12-volt square wave. Press F2 for Scope. Press F2 and use the down arrow to set, voltage range to 20 volts. Set Probe to x10. Press F2 again when complete. Connect the Black lead to the PCAI ground. Connect the Red lead to the PCI Bus circuit in the PCAI connector. Turn the ignition On. Observe the voltage display on the DRBIII(R) Lab Scope. Does the voltage pulse from 0 to approximately 7.5 volts? If yes, replace the Powertrain Control Module. See POWERTRAIN CONTROL MODULE (PCM) . Perform POWERTRAIN VERIFICATION TEST VER-1 . If no, repair the PCI Bus circuit for an open. Perform POWERTRAIN VERIFICATION TEST VER-1 .