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NTC-3A: Checking Pcm Power & Ground Circuits

  1. Turn ignition off. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Using a 12-volt test light connected to ground, probe PCM connector, B+ circuit. For wire color, see WIRING DIAGRAMS article. If test light illuminates brightly, go to next step. If test light does not illuminate brightly, repair open B+ circuit. Perform TEST VER-2A.
  2. Ensure ignition is off. Ensure PCM connectors are still disconnected. Turn ignition on, with engine off. Using 12-volt test light connected to ground, probe PCM connector, fused ignition switch output circuit. For wire color, see WIRING DIAGRAMS article. If test light illuminates brightly, go to next step. If test light does not illuminate brightly, repair open fused ignition switch output circuit. Perform TEST VER-2A.
  3. Turn ignition off. Ensure PCM connectors are still disconnected. Using 12-volt test light connected to ground, probe both PCM connector, ground circuits. For wire color, see WIRING DIAGRAMS article. If test light illuminates brightly on both circuits, go to next step. If test light does not illuminate brightly on both circuits, repair open ground circuit(s). Perform TEST VER-2A.
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