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Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Dodge Intrepid, 2002 Chrysler Intrepid, 2002 Chrysler Concorde, and 2002 Chrysler 300M. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: When testing fused B+, output and ground circuits with a test light, ensure test light illuminates brightly. Compare test light brightness of circuits to brightness of test light when connected to direct battery voltage. If circuits do not illuminate with same brightness as direct battery voltage, circuit must be repaired.
  1. Turn ignition on. Using scan tool, attempt to communicate with Body Control Module (BCM) and Mechanical Instrument Cluster (MIC) control module. If scan tool was able to communicate with both modules, go to next step. If scan tool was not able to communicate with either module, diagnose communication concern. See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  2. Turn ignition switch to LOCK position. Disconnect PCM harness connector C1. See Figure. PCM is located at right side of engine compartment, near Power Distribution Center (PDC). Turn ignition on. Using test light connected to ground, probe fused ignition switch output (OFF/RUN/START) circuit at PCM harness connector C1 terminal No. 12 using Miller Special Tool (8815). If test light illuminates, go to next step. If test light does not illuminate, repair open circuit.
  3. Turn ignition switch to LOCK position. Remove starter relay from Power Distribution Center (PDC). Using test light connected to ground, probe fused ignition switch output (START) circuit at PCM harness connector C1 terminal No. 30 using Miller Special Tool (8815). Momentarily turn ignition switch to START position. If test light illuminates, go to next step. If test light does not illuminate, repair open circuit.
  4. Turn ignition switch to LOCK position. Using a test light connected to ground, probe fused B+ circuit at PCM harness connector C1 terminal No. 29 using Miller Special Tool (8815). If test light illuminates, reinstall starter relay and go to next step. If test light does not illuminate, repair open circuit.
  5. Disconnect PCM harness connector C4. Using test light connected to battery positive terminal, probe all 3 ground circuits at PCM harness connector C4 terminals No. 12, 13 and 14 using Miller Special Tool (8815). See WIRING DIAGRAMS . If test light illuminates at all ground circuits, go to next step. If test light does not illuminate at all ground circuits, repair open circuit. Check main ground connection to engine block and/or chassis. Repair as necessary.
    6. NOTE: Ensure there is PCI Bus communication with other modules on vehicle before proceeding. If communication does not exist, diagnose communication concern. See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT and repair as necessary. Manufacturer recommends using Scope Input Cable (CH7058) and Cable-To-Probe Adapter (CH7062) with Red and Black test leads in the following test.
  6. Ensure PCM harness connectors are disconnected. Connect scope input cable to channel one connector on DRB-III. Attach Red and Black test leads and adapter to scope input cable. Using DRB-III, select Pep Module Tools. Select lab scope. Select Live Data. Select 12-volt square wave. Press F2 for scope. Press F2 and use down arrow to set voltage range to 20 volts. Set probe to x10. Press F2 again when completed. Connect Black test lead to chassis ground. Connect Red test lead to PCI Bus circuit at PCM harness connector C1 terminal No. 38 using Miller Special Tool (8815). Turn ignition on. Observe voltage display on DRB lab scope. If voltage pulses from zero to about 7.5 volts, replace PCM. See POWERTRAIN CONTROL MODULE  under REMOVAL & INSTALLATION. If voltage does not pulse from zero to about 7.5 volts, go to next step.
  7. Turn ignition off. Disconnect BCM harness connector C3. Measure resistance of PCI Bus circuit between BCM harness connector C3 terminal No. 1 and PCM harness connector C1 terminal No. 38 using Miller Special Tool (8815). See WIRING DIAGRAMS . If resistance is less than 5 ohms, replace Body Control Module. See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT. If resistance is 5 ohms or more, repair open PCI Bus circuit.
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