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Symptom: *NO RESPONSE FROM PCM (PCI BUS) POSSIBLE CAUSES PCM PCI NO RESPONSE PCI BUS CIRCUIT OPEN POWERTRAIN CONTROL MODULE TEST ACTION APPLICABILITY 1 Turn the ignition on. t, enter Body then Body Computer. With the DRBIII t, enter Anti-Lock Brakes. With the DRBIII t, enter Body then Electro/Mechanical Cluster (MIC). With the DRBIII t, enter Passive Restraints then Airbag. Were you able to establish communications with any of the modules? All Yes → Go To 2 No → Refer to symptom PCI Bus Communication Failure in the Com- munications category. 2 With the DRBIII t read PCM Diagnostic Trouble Codes. This is to ensure power and grounds to the PCM are operational. t will not read PCM DTC’s, follow the NO RESPONSE TO PCM (SCI only) symptom path. t displays a no response message, refer to the appropriate symptom in the powertrain diagnostic t. Attach the red and black leads and the cable to probe adapter to the scope input cable. t select Pep Module Tools. Select lab scope. t Lab Scope. Does the voltage pulse from 0 to approximately 7.5 volts? All Yes → Replace and program the Powertrain Control Module in accor- dance with the Service Information. No → Repair the PCI Bus circuit for an open. Perform POWERTRAIN VERIFICATION TEST VER - 1. 165 COMMUNICATION |