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Checking Powertrain Control Module (PCM) Power & Ground Circuits (JTEC)

  1. Turn the ignition off. Disconnect the PCM C1 harness connector. Using a 12-volt test light connected to ground, probe the Fused B+ circuit in the PCM harness connector. If test light illuminates brightly, go to next step. If test light does not illuminate brightly, repair the Fused B+ circuit for an open. Perform POWERTRAIN VERIFICATION TEST VER-1 (JTEC)  under VERIFICATION TESTS.
  2. Turn the ignition on, with the engine off. Using 12-volt test light connected to ground, probe the Fused Ignition Switch Output circuit in the PCM C1 harness connector. If test light illuminates brightly, go to next step. If test light does not illuminate brightly, repair the Fused Ignition Switch Output circuit for an open. Perform POWERTRAIN VERIFICATION TEST VER-1 (JTEC)  under VERIFICATION TESTS.
  3. Turn the ignition off. Using 12-volt test light connected to battery voltage, probe the PCM ground circuits in the PCM C1 harness connector. If test light illuminates brightly, test is complete. If test light does not illuminate brightly, repair the PCM ground circuit(s) for an open. Perform POWERTRAIN VERIFICATION TEST VER-1 (JTEC)  under VERIFICATION TESTS.
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