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No Response From PCM (PCI Bus)

NOTE: After making any repairs, perform POWERTRAIN VERIFICATION TEST  under VERIFICATION TESTS.
  1. Turn the ignition on. With the DRBIII, enter ANTI-LOCK BRAKES. With the DRBIII, enter BODY then ELECTRO/MECHANICAL CLUSTER (MIC). With the DRBIII, enter PASSIVE RESTRAINTS then AIRBAG. If you were able to establish communications with any of the modules, go to the next step. If you were not able to establish communications with any of the modules, see PCI BUS COMMUNICATION FAILURE .
  2. With the DRBIII read PCM diagnostic trouble codes. This is to ensure power and grounds to the PCM are operational. If the DRBIII will not read PCM DTCs, see NO RESPONSE FROM PCM (SCI ONLY) . If the vehicle will not start and the DRBIII displays a no response message, perform ENGINE DOES NOT START under SYMPTOMS in TROUBLE SHOOTING - NO CODES - CARS - EXCEPT SEBRING COUPE & STRATUS COUPE article in ENGINE PERFORMANCE. Turn the ignition off. Disconnect the PCM harness connector. See Figure. 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. Attach the Red and Black leads and the Cable-To-Probe Adapter to the Scope Input Cable. With the DRBIII® 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 PCM ground. Connect the Red lead to the PCI bus circuit in the PCM connector. Turn the ignition on. Observe the voltage display on the DRBIII lab scope. If the voltage pulses from 0 to approximately 7.5 volts, replace and program the powertrain control module. See POWERTRAIN CONTROL MODULE  under REMOVAL & INSTALLATION, then see POWERTRAIN CONTROL MODULE (PCM)  under PROGRAMMING. If the voltage does not pulse from 0 to approximately 7.5 volts, repair the PCI bus circuit for an open.
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