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Test K: No Module/Network Communication

WARNING: This page is about a different car, the 2002 Mercury Grand Marquis and 2002 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Perform all voltage and resistance tests using a Digital Volt-Ohm Meter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use ohmmeter to isolate wiring harness shorts or opens.
  1. Check WDS or NGS tester connector and terminals for physical damage or corrosion. If WDS or NGS tester connector and terminals are okay, go to next step. If WDS or NGS tester connector and/or terminals are faulty, repair or replace as necessary. After repair, test system for normal operation.
  2. Turn ignition switch to LOCK position. Inspect DLC for physical damage, bent or corrosion terminals. If DLC and DLC terminals are okay, go to next step. If DLC and DLC terminals are faulty, repair or replace as necessary. After repair, test system for normal operation.
  3. Measure voltage between ground and DLC terminal No. 16 (Yellow/Black wire). See Figure. If battery voltage exists, go to next step. If battery voltage does not exist, repair open or short circuit to ground in Yellow/Black wire between DLC and fuse No. 12 (30-amp) in Battery Junction Box (BJB). BJB is located in right front of engine compartment. See Figure. See POWER DISTRIBUTIONPOWER DISTRIBUTION in WIRING DIAGRAMS article in ELECTRICAL. After repair, test system for normal operation.
  4. Measure resistance between ground and DLC terminals No. 4 (Black wire) and No. 5 (Black/White wire). If both resistances are 5 ohms or less, repair or replace WDS or NGS tester. If either resistance is greater than 5 ohms, repair open circuit in Black and/or Black/White wire between DLC and ground point G201. Ground point G201 is located behind right side rocker panel. See Figure. See GROUND DISTRIBUTIONGROUND DISTRIBUTION in WIRING DIAGRAMS article in ELECTRICAL. After repair, clear DTCs and test system for normal operation.
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