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Test E: No Module/Network Communications - ISO 9141 Link

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 (Orange/Blue wire). This is the International Standards Organization (ISO) 9141 diagnostic communications network circuit.
NOTE: When performing the following test, scan tool may display ISO circuit No. 529 as circuit No. 70.
  1. Inspect scan tool connector for loose, damaged or corroded terminals. Pay particular attention to terminals No. 4 and 7. Repair as necessary and retest system for normal operation. If connector is okay, inspect DLC for loose, damaged or corroded terminals. Pay particular attention to terminals No. 4 (Black wire) and No. 7 (Orange/Blue wire). Repair as necessary and retest system for normal operation. If connector is okay, go to next step.
  2. Turn ignition on. Measure voltage between terminals No. 5 (Blue/Orange wire) and No. 7 (Orange/Blue wire) at DLC. See Figure . If any voltage is indicated, go to next step. If no voltage is indicated, go to step  5 .
  3. Turn ignition off. Measure voltage between terminals No. 7 (Orange/Blue wire) and No. 16 (Green wire) at DLC. If voltage is indicated, go to next step. If no voltage is indicated, go to step  5 .
  4. Turn ignition off. Disconnect 14-pin in-line connector (Blue) located near clutch pedal position switch. See Figure . Measure resistance of Orange/Blue wire between terminal No. 7 at DLC and terminal No. 5 at in-line connector C229. See Figure and Fig 1 . If resistance is less than 5 ohms, repair Orange/Blue wire between connectors C222, C229, C233 and C262. Retest system for normal operation. If resistance is 5 ohms or more, repair Orange/Blue wire between in-line connector C229 and DLC. Retest system for normal operation.
  5. Turn ignition off. Disconnect 14-pin in-line connector (Blue) located near clutch pedal position switch. See Figure . Turn ignition on. Measure voltage between terminals No. 7 (Orange/Blue wire) and No. 16 (Green wire) at DLC. Also, measure voltage between terminals No. 7 (Orange/Blue wire) and No. 4 (Black wire) at DLC. See Figure . If voltage is indicated for either measurement, repair Orange/Blue wire between DLC and in-line connector C229. Retest system for normal operation. If no voltage is indicated for both measurements, reconnect in-line connector C229, and then go to next step.
  6. If vehicle is equipped with Electronic Crash Sensor (ECS) module and Anti-Lock Brake System (ABS) module and/or Remote Anti-Theft Personality (RAP) module, go to next step. If vehicle is only equipped with ECS module, go to step  8 . If vehicle is not equipped with ECS module, go to step  11 .
  7. Turn ignition off. Deactivate air bag system. See appropriate AIR BAG RESTRAINT SYSTEMS article. Disconnect air bag diagnostic monitor connector under front of center console. Reconnect positive battery cable, and then negative battery cable. Turn ignition on. Perform data link diagnostic test. See DATA LINK DIAGNOSTIC TEST  under SELF-DIAGNOSTIC SYSTEM. If scan tool displays CKT 70 = ALL ECUS NO RESP/NOT EQUIP, go to step  10 . If scan tool does not display CKT 70 = ALL ECUS NO RESP/NOT EQUIP, replace ECS module and retest system for normal operation.
  8. Turn ignition off. Disconnect scan tool. Deactivate air bag system. See appropriate AIR BAG RESTRAINT SYSTEMS article. Disconnect ECS module connector under front of center console. Reconnect positive battery cable, and then negative battery cable. Turn ignition on. Measure voltage between terminals No. 7 (Orange/Blue wire) and No. 16 (Green wire) at DLC. Also, measure voltage between terminals No. 4 (Black wire) and No. 7 (Orange/Blue wire) at DLC. See Figure . If voltage is indicated for either measurement, go to next step. If no voltage is indicated for both measurements, replace ECS module and retest system for normal operation.
  9. Turn ignition off. Disconnect 6-pin in-line connector C233 (White) located behind left side of instrument panel. See Figure . Turn ignition on. Measure voltage between terminals No. 7 (Orange/Blue wire) and No. 16 (Green wire) at DLC. Also, measure voltage between terminals No. 4 (Black wire) and No. 7 (Orange/Blue wire) at DLC. See Figure . If voltage is indicated for either measurement, repair Orange/Blue wire between in-line connectors C229 and C233. Retest system for normal operation. If no voltage is indicated for both measurements, repair Orange/Blue wire between in-line connector C233 and ECS module connector. Retest system for normal operation.
  10. Turn ignition off. Disconnect 6-pin in-line connector C233 (White) located behind left side of instrument panel. See Figure . Turn ignition on. Perform data link diagnostic test. See DATA LINK DIAGNOSTIC TEST  under SELF-DIAGNOSTIC SYSTEM. If scan tool displays CKT 70 = ALL ECUS NO RESP/NOT EQUIP, go to next step. If scan tool does not display CKT 70 = ALL ECUS NO RESP/NOT EQUIP, repair Orange/Blue wire between in-line connector C233 and ECS module connector. Retest system for normal operation.
  11. If vehicle is equipped with ABS module and RAP module, go to next step. If vehicle is only equipped with RAP module, go to step  13 . If vehicle is not equipped with RAP module, go to step  16 .
  12. Disconnect RAP module 26-pin connector C405. Turn ignition on. Perform data link diagnostic test. See DATA LINK DIAGNOSTIC TEST  under SELF-DIAGNOSTIC SYSTEM. If scan tool displays CKT 70 = ALL ECUS NO RESP/NOT EQUIP, go to step  15 . If scan tool does not display CKT 70 = ALL ECUS NO RESP/NOT EQUIP, replace RAP module and retest system for normal operation.
  13. Turn ignition off. Disconnect scan tool and RAP module 26-pin connector C405. Turn ignition on. Measure voltage between terminals No. 7 (Orange/Blue wire) and No. 16 (Green wire) at DLC. Also, measure voltage between terminals No. 4 (Black wire) and No. 7 (Orange/Blue wire) at DLC. See Figure . If voltage is indicated for either measurement, go to next step. If no voltage is indicated for both measurements, replace RAP module and retest system for normal operation.
  14. Turn ignition off. Disconnect 17-pin in-line connector C222 (Black) located behind left side of instrument panel, near fuse block. See Figure . Turn ignition on. Measure voltage between terminals No. 7 (Orange/Blue wire) and No. 16 (Green wire) at DLC. Also, measure voltage between terminals No. 4 (Black wire) and No. 7 (Orange/Blue wire) at DLC. See Figure . If voltage is indicated for either measurement, repair Orange/Blue wire between connectors C222, C229 and C233. Retest system for normal operation. If no voltage is indicated for both measurements, repair Orange/Blue wire between RAP module connectors C222 and C405. Retest system for normal operation.
  15. Turn ignition off. Disconnect 17-pin in-line connector C222 (Black) located behind left side of instrument panel, near fuse block. See Figure . Disconnect scan tool. Turn ignition on. Perform data link diagnostic test. See DATA LINK DIAGNOSTIC TEST  under SELF-DIAGNOSTIC SYSTEM. If scan tool displays CKT 70 = ALL ECUS NO RESP/NOT EQUIP, go to next step. If scan tool does not display CKT 70 = ALL ECUS NO RESP/NOT EQUIP, repair Orange/Blue wire between in-line connector C222 and RAP module connector C405. Retest system for normal operation.
  16. If vehicle is equipped with ABS module, go to next step. If vehicle is not equipped with ABS module, system is functioning properly at this time. Testing is complete.
  17. Turn ignition off. Disconnect ABS control module 40-pin connector located under front passenger's seat. Disconnect scan tool. Turn ignition on. Measure voltage between terminals No. 7 (Orange/Blue wire) and No. 16 (Green wire) at DLC. Also, measure voltage between terminals No. 4 (Black wire) and No. 7 (Orange/Blue wire) at DLC. See Figure . If voltage is indicated for either measurement, go to next step. If no voltage is indicated for both measurements, replace ABS module and retest system for normal operation.
  18. Turn ignition off. Disconnect 18-pin in-line connector C262 (Black). See Figure . Turn ignition on. Measure voltage between terminals No. 7 (Orange/Blue wire) and No. 16 (Green wire) at DLC. Also, measure voltage between terminals No. 4 (Black wire) and No. 7 (Orange/Blue wire) at DLC. See Figure . If voltage is indicated for either measurement, repair Orange/Blue wire between in-line connectors C222 (if equipped), C229, C233 and C262. Retest system for normal operation. If no voltage is indicated for both measurements, replace ABS module and retest system for normal operation.
Fig 1: Identifying Connector C229 Terminals (Male Half Of Connector Shown)
G98H01710Courtesy of FORD MOTOR CO.
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