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Test H: No Module/Network Communication

  1. Inspect NGS tester 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.
  2. Turn ignition off. Inspect Data Link Connector (DLC) for physical damage, bent terminals or corrosion. Repair as necessary and retest system for normal operation. If connector is okay, go to next step.
  3. Turn ignition off. Remove and inspect fuse No. 23 (20-amp) from instrument panel fuse block. If fuse is okay, reinstall and go to step  5. If fuse is open, go to next step.
  4. Replace fuse and retest system for normal operation. Recheck fuse. If fuse is okay, go to next step. If fuse is open, repair short to ground in circuit No. 1047 (Light Green/Red wire) between instrument panel fuse block and DLC. Retest system for normal operation.
  5. Measure voltage between ground and terminal No. 16 (Light Green/Red wire) at DLC. See Figure. If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair circuit No. 1047 (Light Green/Red wire) between instrument panel fuse block and DLC. Retest system for normal operation.
  6. Measure resistance between ground and terminals No. 4 (Black wire) and No. 5 (Black/White wire) at DLC. If both measurements indicate less than 5 ohms, repair or replace NGS tester. Retest system for normal operation. If either measurement indicates 5 ohms or more, repair open in Black wire or Black/White wire between ground and DLC. Retest system for normal operation.
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