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Test H: No Module/Network Communication

  1. Turn ignition switch to LOCK position. Inspect NGS tester connector for loose, damaged or corroded terminals. If connector is okay, go to next step. If problem exists, repair connector as necessary.
  2. Inspect Data Link Connector (DLC) for loose, damaged or corroded terminals. If connector is okay, go to next step. If problem exists, repair connector as necessary.
  3. Measure voltage at terminal No. 16 (Light Green/Red wire) at DLC. See Figure . If battery voltage exists, go to next step. If battery voltage does not exist, repair power distribution circuit as necessary. See appropriate wiring diagram in POWER DISTRIBUTION article in WIRING DIAGRAMS.
  4. Measure resistance between ground and terminals No. 4 (Black wire) and No. 5 (Blue/Yellow wire) at DLC. If both resistance readings are 5 ohms or less, repair or replace NGS tester. If either resistance reading is greater than 5 ohms, repair open in appropriate wire between ground and DLC.
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