Test G: Auxiliary Powertrain 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-pin Auxiliary Powertrain Control Module (APCM) harness connector. Inspect APCM connector for loose, damaged or corroded terminals. Repair connector as necessary. If APCM connector is okay, go to next step.
- Measure resistance of Tan/Orange wire between APCM harness connector terminal No. 2 and Data Link Connector (DLC) terminal No. 2. See Figure and Fig 1 . Also measure resistance of Pink/Light Blue wire between APCM harness connector terminal No. 4 and DLC terminal No. 10. If each resistance is less than 5 ohms, go to next step. If either resistance is 5 ohms or more, repair open in appropriate wire between APCM and DLC.
- Disconnect APCM 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 APCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article in ENGINE PERFORMANCE. If problem no longer exists, problem may have been caused by poor contact at connector.