Test D: Auxiliary Powertrain Control Module Does Not Respond To Scan Tool
- Turn ignition off. Disconnect APCM connector located below left side of instrument panel. 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. 1 at APCM 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. 3 at APCM connector and terminal No. 10 at DLC. If both resistance measurements are less than 5 ohms, replace APCM and 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 APCM connector and DLC. Retest system for normal operation.
Courtesy of FORD MOTOR CO.