Test D: 4-Wheel Drive Control 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 4-wheel drive control module harness connector C281a. Inspect harness connector C281a for loose, damaged or corroded terminals. Repair connector as necessary. If harness connector C281a is okay, go to next step.
- Measure resistance of Light Blue/White wire between 4-wheel drive control module harness connector C281a terminal No. 25 and Data Link Connector (DLC) terminal No. 7. See Figure and Fig 1 . If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Light Blue/White wire between DLC and 4-wheel drive control module connector C281a.
- Disconnect all 4-wheel drive control module harness 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 4-wheel drive control module. See 4-WHEEL DRIVE CONTROL MODULE under REMOVAL & INSTALLATION. If problem no longer exists, problem may have been caused by poor contact at connector.