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Test F: No Module/Network Communication - ISO 9141 Network

WARNING: This page is about a different car, the 2002 Ford RV Cutaway, 2002 Ford Econoline, 2002 Ford E450 Super Duty, and 2002 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Depending on module configuration, with all modules connected and with ignition switch in RUN position or with engine running, 2-3 volts may be present at DLC terminal No. 7 (Light Blue/White wire). See Figure. This is the International Standards Organization (ISO) 9141 diagnostic communications network circuit.
  1. Turn ignition switch to OFF position. Inspect DLC for physical damage, bent terminals or corrosion. Pay particular attention to terminal No. 7 (Light Blue/White wire). See Figure. DLC is located below driver's side of instrument panel, to right of steering column. If connector is okay, go to next step. If connector is faulty, repair connector as necessary. Retest system operation.
    2. NOTE: Electronic Crash Sensor (ECS) module may also be referred to as air bag diagnostic monitor.
  2. Deactivate air bag system. See AIR BAG RESTRAINT SYSTEMS article in RESTRAINTS. Disconnect ECS Gray 28-pin harness connector C2209 located behind right kick panel. Measure resistance of Light Blue/White wire between DLC terminal No. 7 and ECS module Gray 28-pin harness connector C2209 terminal No. 19. See Figure and Figure . If resistance is less than 5 ohms, and vehicle is not equipped with 4-Wheel Anti-Lock Brake System (4WABS), go to next step. If resistance is less than 5 ohms, and vehicle is equipped with 4WABS, go to step  5. If resistance is 5 ohms or more and vehicle is not equipped with 4WABS, see TEST B: ELECTRONIC CRASH SENSOR MODULE DOES NOT RESPOND TO SCAN TOOL . If resistance is 5 ohms or more and vehicle is equipped with 4WABS, repair open in Light Blue/White wire between DLC and Black 14-pin in-line connector C210 (male side) located behind right kick panel, and Natural 76-pin in-line connector C237 (female side) located on driver's side of engine compartment, on firewall. Retest system operation.
  3. Turn ignition switch to RUN position. Measure voltage between DLC terminals No. 4 (Black wire) and No. 7 (Light Blue/White wire), and between terminals No. 7 (Light Blue/White wire) and No. 16 (Light Green/Red wire). See Figure. If either measurement indicates voltage, go to next step. If both measurements indicate zero volts, replace ECS module. Retest system operation.
  4. Turn ignition switch to OFF position. Disconnect Black 14-pin in-line connector C210 located behind right kick panel. Turn ignition switch to RUN position. Measure voltage between DLC terminals No. 4 (Black wire) and No. 7 (Light Blue/White wire), and between terminals No. 7 (Light Blue/White wire) and No. 16 (Light Green/Red wire). If either measurement indicates voltage, repair Light Blue/White wire between Black 14-pin in-line connector C210, Natural 76-pin in-line connector C237 (if equipped with 4WABS control module), and DLC. Retest system operation. If both measurements indicate zero volts, repair Light Blue/White wire between Black 14-pin in-line connector C210 and ECS module Gray 28-pin harness connector C2209. Retest system operation.
  5. Turn ignition switch to RUN position. Measure voltage between DLC terminals No. 4 (Black wire) and No. 7 (Light Blue/White wire), and between terminals No. 7 (Light Blue/White wire) and No. 16 (Light Green/Red wire). See Figure. If either measurement indicates zero volts, go to next step. If both measurements indicate voltage, replace ECS module. Retest system operation.
  6. Turn ignition switch to OFF position. Disconnect 4WABS control module Black 24-pin harness connector C155a, located on left front frame rail. Turn ignition switch to RUN position. Measure voltage between DLC terminals No. 4 (Black wire) and No. 7 (Light Blue/White wire), and between terminals No. 7 (Light Blue/White wire) and No. 16 (Light Green/Red wire). If either measurement indicates voltage, go to next step. If both measurements indicate zero volts, replace 4WABS control module.
  7. Turn ignition switch to OFF position. Disconnect Natural 76-pin in-line connector C237 located on driver's side of engine compartment on firewall. Turn ignition switch to RUN position. Measure voltage between DLC terminals No. 4 (Black wire) and No. 7 (Light Blue/White wire), and between terminals No. 7 (Light Blue/White wire) and No. 16 (Light Green/Red wire). If either measurement indicates voltage, go to step  4. If both measurements indicate zero volts, repair Light Blue/White wire between Natural 76-pin in-line connector C237 and 4WABS control module Black 24-pin harness connector C155a. Retest system operation.
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