Test C: Overhead Trip Computer Module Does Not Respond To WDS Or NGS Tester
WARNING: This page is about a different car, the 2002 Ford Pickup, 2002 Ford F550 Super Duty, 2002 Ford F450 Super Duty, and 2002 Ford Excursion. However, it is still accessible from the selected car via links, so may be relevant.
- Turn ignition switch to LOCK position. Disconnect Overhead Trip Computer (OTC) harness connector C945. Inspect OTC connector for loose, damaged or corroded terminals. Repair connector as necessary. If OTC connector is okay, go to next step.
- Measure resistance of Light Blue/White wire between OTC harness connector C945 terminal No. 1 and Data Link Connector (DLC) terminal No. 7. See Figure and Fig 1 . If resistance is less than 5 ohms, go to step 4. If resistance is 5 ohms or more, go to next step.
- Disconnect in-line 14-pin connector C222. Inspect in-line 14-pin connector C222 for loose, damaged or corroded terminals. Repair connector as necessary. Measure resistance in Light Blue/White wire between DLC terminal No. 7 and in-line harness connector C222 (male side) terminal No. 13. See Figure and Fig 2 . If resistance is less than 5 ohms, repair open in Light Blue/White wire between in-line harness connector C122 (female side) and OTC connector. If resistance is greater than 5 ohms, repair open in Light Blue/White wire between in-line harness connector C222 (male side) and DLC. See WIRING DIAGRAMS .
- Disconnect all OTC connectors and inspect for loose, damaged or corroded terminals. Repair connector as necessary. Reconnect all connectors. Operate system to verify problem. If problem is present, replace OTC module. See OVERHEAD TRIP COMPUTER under REMOVAL & INSTALLATION in OVERHEAD CONSOLES article. If problem no longer exists, problem may have been caused by poor contact at connector.