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No Response From PCM (SCI Only)

NOTE: After making any repairs, perform POWERTRAIN VERIFICATION TEST  under VERIFICATION TESTS.
    NOTE: With the DRBIII® in the generic scan tool mode, attempt to communicate with the PCM. If the DRBIII® can communicate with the PCM in the generic scan tool mode, it may not be necessary to perform this step.
  1. Perform checking PCM power and ground circuits. See CHECKING PCM POWER & GROUND CIRCUITS . If the vehicle passed this test, go to next step. If the vehicle did not pass this test, repair as necessary.
  2. Turn the ignition off. Disconnect the PCM harness connector. See Figure. Disconnect the DRBIII® from the DLC. Measure the resistance between ground and the SCI transmit circuit. If the resistance is below 5.0 ohms, go to next step. If the resistance is not below 5.0 ohms, go to step  4.
    3. NOTE: If the resistance is below 5.0 ohms and the vehicle is not equipped with a TCM, repair the SCI transmit circuit for a short to ground.
  3. Turn the ignition off. Disconnect the TCM harness connector (if equipped). Measure the resistance between ground and the SCI transmit circuit. If the resistance is below 5.0 ohms, repair the SCI transmit circuit for a short to ground. If the resistance is above 5.0 ohms, replace the transmission control module.
  4. Turn the ignition off. Disconnect the DRBIII® from the DLC. Disconnect the PCM harness connector. See Figure. Disconnect the TCM harness connector (if equipped). Turn the ignition on. Measure the voltage of the SCI transmit circuit at the DLC connector (cav 7). If the voltage is above 1.0 volt, repair the SCI transmit circuit for a short to voltage. If the voltage is below 1.0 volt, go to next step.
  5. Turn the ignition off. Disconnect the DRBIII from the DLC. Disconnect the PCM harness connector. Turn the ignition on. Measure the voltage of the SCI receive circuit at the DLC connector (cav 6). If the voltage is above 1.0 volt, repair the SCI receive circuit for a short to voltage. If the voltage is below 1.0 volt, go to next step.
  6. Turn the ignition off. Disconnect the DRBIII from the DLC. Disconnect the PCM harness connector. Measure the resistance between the SCI transmit circuit and the SCI receive circuit at the PCM connector. If the resistance is below 5.0 ohms, repair the short between the SCI transmit and the SCI receive circuits. If the resistance is above 5.0 ohms, go to next step.
  7. Turn the ignition off. Disconnect the PCM harness connector. Disconnect the DRBIII from the DLC. Measure the resistance between ground and the SCI receive circuit. If the resistance is below 5.0 ohms, repair the SCI receive circuit for a short to ground. If the resistance is above 5.0 ohms, go to next step.
  8. Turn the ignition off. Disconnect the PCM harness connector. Disconnect the DRBIII from the DLC. Measure the resistance of the SCI receive circuit between the PCM connector and the DLC. If the resistance is below 5.0 ohms, go to next step. If the resistance is above 5.0 ohms, repair the SCI receive circuit for an open.
  9. Turn the ignition off. Disconnect the PCM harness connector. Disconnect the DRBIII from the DLC. Measure the resistance of the SCI transmit circuit between the PCM connector and the DLC. If the resistance is below 5.0 ohms, go to the next step. If the resistance is above 5.0 ohms, repair the SCI transmit circuit for an open.
  10. If there are no possible causes remaining, replace and program the powertrain control module. See POWERTRAIN CONTROL MODULE  under REMOVAL & INSTALLATION, then see POWERTRAIN CONTROL MODULE (PCM)  under PROGRAMMING.
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