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No Response From PCM (SCI Only)

NOTE: After making any repairs, perform POWERTRAIN VERIFICATION TEST  under VERIFICATION TESTS. Unless instructed otherwise in test step, reconnect any disconnected connectors.
  1. Turn ignition off. Using an ohmmeter, check resistance between ground and Data Link Connector (DLC) terminals No. 4 and 5, ground circuits (Black wires). DLC is located on bottom of instrument panel, to left of brake pedal. See Figure and Figure . If resistance is less than 5 ohms on both circuits, go to next step. If resistance is 5 ohms or more on either circuit, repair open Black wire(s).
  2. Ensure ignition is off. Connect scan tool to DLC. Using scan tool, attempt to read DTCs. If scan tool displays NO RESPONSE, turn ignition on and attempt to read DTCs. If scan tool still displays NO RESPONSE, go to next step. If scan tool does not display NO RESPONSE, test is complete.
  3. Turn ignition off. Substitute a known-good scan tool cable. Turn ignition on and attempt to read DTCs. If scan tool displays NO RESPONSE, go to next step. If scan tool does not display NO RESPONSE, replace original scan tool cable.
  4. Turn ignition off. Disconnect Powertrain Control Module (PCM) C1 Black and C2 Gray connectors. Disconnect scan tool. Using an ohmmeter, check resistance of SCI receive circuit (Light Green wire) between DLC terminal No. 6 and PCM Gray connector terminal No. 75. See Figure and Figure . If resistance is less than 5 ohms, leave PCM connectors disconnected and go to next step. If resistance is 5 ohms or more, repair open Light Green wire.
  5. Using ohmmeter, check resistance of PCM Gray connector terminal No. 75, SCI receive circuit (Light Green wire). If resistance is less than 5 ohms, repair Light Green wire for short to ground. If resistance is 5 ohms or more, leave PCM connectors disconnected and go to next step.
  6. Using ohmmeter, check resistance of SCI transmit circuit (Pink wire) between DLC connector terminal No. 7 and PCM Gray connector terminal No. 65. If resistance is less than 5 ohms, leave PCM connectors disconnected and go to next step. If resistance is 5 ohms or more, repair open Pink wire.
  7. Using ohmmeter, check resistance between ground and PCM Gray connector terminal No. 65 (Pink wire). If resistance is less than 5 ohms, repair Pink wire for short to ground. If resistance is 5 ohms or more, reconnect PCM connectors and go to next step.
  8. Connect scan tool to a functional DLC on another vehicle and attempt to read DTCs. If scan tool displays NO RESPONSE, repair or replace scan tool. If scan tool does not display NO RESPONSE, replace initial vehicle's PCM. See POWERTRAIN CONTROL MODULE (PCM)  under REMOVAL & INSTALLATION.
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