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Test NTC-14: Checking Pcm Power & Ground Circuits

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article.
  1. Ensure ignition is off. Disconnect connectors at Powertrain Control Module (PCM). PCM is located between driver's side front fender and power distribution center, near battery.
  2. Using ohmmeter, check resistance between ground and PCM connector terminal No. 10 (Black/Tan wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open circuit on Black/Tan wire between PCM and ground. Perform TEST VER-2A .
  3. Turn ignition on. Using voltmeter, check voltage at fused ignition switch output circuit at PCM connector terminal No. 20 (White/Black wire). If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open circuit on fused ignition switch output circuit (White/Black wire) to PCM. White/Black wire goes from PCM to power distribution center, and then to Positive Temperature Coefficient (PTC) No. 1 in junction block, located behind driver's side of instrument panel, to the left of steering column. PTC receives voltage when ignition is on. Perform TEST VER-2A .
    NOTE: PTC is a specified amperage solid-state circuit breaker located in junction box. PTC may reset when all current is removed from PTC for approximately 20 seconds.
  4. Turn ignition off. Using ohmmeter, check resistance between ground and PCM connector terminal No. 50 (Black/Tan wire). If resistance is less than 5 ohms, test is complete. If resistance is 5 ohms or more, repair open circuit on Black/Tan wire between PCM and ground. Perform TEST VER-2A .
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