Test C: Powertrain Control Module Does Not Respond To Scan Tool
NOTE:
If test results indicate PCM is faulty, always check for any engine performance-related DTCs prior to replacing PCM. If any DTCs are present, service DTCs as necessary and retest. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
- Turn ignition off. Disconnect PCM connector located in left rear of engine compartment, near brake master cylinder. Inspect connector for loose, damaged or corroded terminals. Repair connector as necessary and retest system for normal operation. If connector is okay, go to next step.
- Measure resistance of Tan/Orange wire between terminal No. 16 at PCM connector and terminal No. 2 at Data Link Connector (DLC). See Figure and Fig 1 . Also, measure resistance of Pink/Light Blue wire between terminal No. 15 at PCM connector and terminal No. 10 at DLC. If both resistance measurements are less than 5 ohms, replace PCM and retest system for normal operation. If either resistance measurement is 5 ohms or more, go to next step.
- Disconnect 76-pin connector C234 (Natural) located on driver's side of engine compartment on firewall. Inspect connector for loose, damaged or corroded terminals. Repair connector as necessary and retest system for normal operation. If connector is okay, go to next step.
- Measure resistance of Tan/Orange wire between terminal No. 61 at female half of connector C234 and terminal No. 2 at DLC. See Figure and Figure . Also, measure resistance of Pink/Light Blue wire between terminal No. 59 at female half of connector C234 and terminal No. 10 at DLC. If both resistance measurements are less than 5 ohms, repair open in Tan/Orange wire and/or Pink/Light Blue wire between PCM connector and male half of connector C234. Retest system for normal operation. If either resistance measurement is 5 ohms or more, repair open in Tan/Orange wire and/or Pink/Light Blue wire between female half of connector C234 and DLC. Retest system for normal operation.