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HOMESERVICE MANUALSFORD1997EXPLORER 4D UTILITY, 4.0 X, RWD, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)BODY & FRAMEBODY, CAB CONTROL SYSTEMSMODULE COMMUNICATIONS NETWORKTESTINGTEST H: NO MODULE/NETWORK COMMUNICATIONS - ISO 9141
1997 Ford Explorer 4D Utility, 4.0 X, RWD, Automatic

Test H: No Module/Network Communications - ISO 9141

1997 Ford Explorer 4D Utility, 4.0 X, RWD, AutomaticSECTION Test H: No Module/Network Communications - ISO 9141
NOTE: Before disconnecting or connecting any module, ensure ignition switch is in OFF position.
  1. Turn ignition off. Inspect Data Link Connector (DLC) for physical damage, bent terminals or corrosion. Pay particular attention to terminal No. 7 (Light Blue/White wire). Repair or replace connector as necessary and retest system. If connector is okay, go to next step.
  2. Ensure ignition is off. Disconnect negative battery cable. Wait one minute for air bag backup power to be depleted. Disconnect air bag diagnostic monitor connector C233 located behind right side of instrument panel. Measure resistance of Light Blue/White wire between air bag diagnostic monitor connector C233, terminal No. 12 and DLC, terminal No. 7. See Figure. If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair open in Light Blue/White wire between air bag diagnostic monitor connector and DLC and retest system.
  3. Reconnect negative battery cable. Perform DATA LINK DIAGNOSTICS under COMMUNICATION NETWORK DIAGNOSTICS . If DTC 00000001F is displayed, go to next step. If DTC 00000001F is not displayed, replace air bag diagnostic monitor and retest system.
  4. Verify vehicle is equipped with Automatic Ride Control (ARC) module. ARC module is located behind left center of instrument panel. If vehicle is equipped with ARC module, go to next step. If vehicle is not equipped with ARC module, go to step 6).
  5. Disconnect ARC module connector. Perform DATA LINK DIAGNOSTICS under COMMUNICATION NETWORK DIAGNOSTICS . If DTC 00000001F is displayed, go to next step. If DTC 00000001F is not displayed, replace ARC module and retest system.
  6. Measure voltage between DLC, terminals No. 7 (Light Blue/White wire) and No. 4 (Black wire). See Figure. If voltage is zero, go to step 8). If voltage is not zero, go to next step.
  7. Measure voltage between DLC, terminals No. 7 (Light Blue/White wire) and No. 16 (Orange wire). If voltage is zero, go to next step. If voltage is not zero, check NGS tester for proper operation.
  8. Disconnect bulkhead connector C148 located at left rear corner of engine compartment. Perform DATA LINK DIAGNOSTICS  under COMMUNICATION NETWORK DIAGNOSTICS. If DTC 00000001F is displayed, go to step 10). If DTC 00000001F is not displayed, reconnect bulkhead connector C148 and go to next step.
  9. Disconnect Anti-Lock Brake System (ABS) module connector C186 located at left side of engine compartment. Perform DATA LINK DIAGNOSTICS under COMMUNICATION NETWORK DIAGNOSTICS . If DTC 00000001F is displayed, repair short on Light Blue/White wire between ABS module connector and bulkhead connector and retest system. If DTC 00000001F is not displayed, replace ABS module and retest system.
  10. Verify vehicle is equipped with Remote Anti-Theft Personality (RAP) module. RAP module is located behind left rear quarter panel. If vehicle is equipped with RAP module, go to next step. If vehicle is not equipped with RAP module, go to step 13).
  11. Perform DATA LINK DIAGNOSTICS  under COMMUNICATION NETWORK DIAGNOSTICS. If DTC 00000001F is displayed, go to step 13). If DTC 00000001F is not displayed, reconnect bulkhead connector and go to next step.
  12. Disconnect RAP module connectors. Perform DATA LINK DIAGNOSTICS under COMMUNICATION NETWORK DIAGNOSTICS . If DTC 00000001F is displayed, repair short in Light Blue/White wire between RAP module connector and bulkhead connector and retest system. If DTC 00000001F is not displayed, replace RAP module and retest system.
  13. Verify vehicle is equipped with Generic Electronic Module (GEM). GEM is located behind center of instrument panel. If vehicle is equipped with GEM, go to next step. If vehicle is not equipped with GEM, repair short in Light Blue/White wire and retest system.
  14. Disconnect GEM connector. Perform DATA LINK DIAGNOSTICS under COMMUNICATION NETWORK DIAGNOSTICS . If DTC 00000001F is displayed, repair short in Light Blue/White wire between GEM connector and DLC and retest system. If DTC 00000001F is not displayed, replace GEM and retest system
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.