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Diagnostic System Check

NOTE: For terminal and circuit identification, see WIRING DIAGRAMS  .
  1. Ensure EBCM is properly connected. Turn ignition on, with engine off. Connect scan tool to Data Link Connector (DLC), located under left side of instrument panel. Using scan tool, select ABS DATA LIST. If data is being received from EBCM, go to step 6). If data is not being received from EBCM, go to next step.
  2. Ensure DLC connection is secure. If scan tool displays NO COMMUNICATION WITH VEHICLE, diagnose serial data line. See appropriate DATA LINK CONNECTORS article in WIRING DIAGRAMS section. If scan tool does not display NO COMMUNICATION WITH VEHICLE, go to next step.
  3. Turn ignition off. Remove and check ERLS (switched ignition) fuse. If fuse is blown, go to step 9). If fuse is okay, go to next step.
  4. Remove and check INT LPS (battery feed) fuse. If fuse is blown, go to step 12). If fuse is okay, go to next step.
  5. Reinstall ERLS fuse and INT LPS fuse. Disconnect EBCM connector. Using DVOM, measure resistance between negative battery terminal and ground circuit (Black wire) of EBCM connector. If resistance is 0-2 ohms, go to step 15). If resistance is not 0-2 ohms, go to step 25).
  6. Using scan tool, read DTCs. If any current non-VES system DTCs are set, go to clear non-VES system DTCs first. If no current non-VES system DTCs are set, go to next step.
  7. Turn ignition off. Wait 10 seconds. Turn ignition switch to RUN position. Observe ABS warning indicator. If indicator illuminates for 3 seconds and then goes out, go to next step. If indicator does not illuminate for 3 seconds, go to step 24).
  8. Using scan tool, display DTCs. If any history DTCs are set, review enhanced diagnostics information in scan tool operation manual. If no history DTCs are set, system is okay. Proceed to DIAGNOSIS & TESTING  for further diagnosis.
  9. Replace switched ignition fuse. Turn ignition on. Wait 10 seconds. Turn ignition off. Remove and check ERLS fuse. If fuse is blown, go to next step. If fuse is okay, go to step 26).
  10. Disconnect EBCM connector. Replace ERLS fuse. Turn ignition on. Wait 10 seconds. Turn ignition off. Remove and check ERLS fuse. If fuse is blown, go to step 27). If fuse is okay, go to next step.
  11. Check switched ignition circuit (Pink wire) between fuse block and EBCM for damage resulting in a short to ground with EBCM connector connected. Check EBCM connector and wiring harness for damage resulting in a short to ground with EBCM connector connected. Reconnect all connectors. Turn ignition on. Wait 10 seconds. Turn ignition off. Remove and check ERLS fuse. If fuse is blown, go to step 39). If fuse is okay, review enhanced diagnostics information in scan tool operation manual.
  12. Replace INT LPS fuse. Turn ignition on. Wait 10 seconds. Turn ignition off. Remove and check INT LPS fuse. If fuse is blown, go to next step. If fuse is okay, go to step 28).
  13. Disconnect EBCM connector. Replace INT LPS fuse. Turn ignition on. Wait 10 seconds. Turn ignition off. Remove and check INT LPS fuse. If fuse is blown, go to step 29). If fuse is okay, go to next step.
  14. Check battery feed circuit (Orange wire) between fuse block and EBCM for damage resulting in a short to ground with EBCM connector connected. Check EBCM connector and wiring harness for damage resulting in a short to ground with EBCM connector connected. Reconnect all connectors. Turn ignition on. Wait 10 seconds. Turn ignition off. Remove and check INT LPS fuse. If fuse is blown, go to step 38). If fuse is okay, review enhanced diagnostics information in scan tool operation manual.
  15. Using DVOM, measure voltage between battery feed circuit (Orange wire) of EBCM connector and ground. If battery voltage is present, go to next step. If battery voltage is not present, go to step 19).
  16. Turn ignition on. Using DVOM set to DC scale, measure voltage between switched ignition circuit (Pink wire) of EBCM connector and ground. If battery voltage is present, go to next step. If battery voltage is not present, go to step 20).
  17. Turn ignition off. Disconnect negative battery cable. Disconnect positive battery cable. Using DVOM, measure resistance between positive battery terminal and battery feed circuit (Orange wire) of EBCM connector. Also, measure resistance between positive battery terminal and switched ignition circuit (Pink wire) of EBCM connector. If resistance is 0-2 ohms on both measurements, go to next step. If resistance is not 0-2 ohms on both measurements, go to step 21).
  18. Check EBCM and EBCM harness connector terminals for poor terminal contact. Check battery terminals and battery cable terminals for poor connection. Repair or replace faulty terminals. After repairs, go to step 1).
  19. Turn ignition off. Remove INT LPS fuse. Disconnect negative battery cable. Disconnect positive battery cable. Using DVOM, measure resistance of battery feed circuit (Orange wire) between fuse block and EBCM connector. If resistance is 0-2 ohms, go to step 30). If resistance is not 0-2 ohms, go to step 31).
  20. Turn ignition off. Remove ERLS fuse. Disconnect negative battery cable. Disconnect positive battery cable. Turn ignition on. Using DVOM, measure resistance of switched ignition circuit (Pink wire) between fuse block and EBCM connector. If resistance is 0-2 ohms, go to step 32). If resistance is not 0-2 ohms, go to step 33).
  21. If battery feed circuit (Orange wire) of EBCM connector resistance is more than 2 ohms, go to next step. If battery feed circuit of EBCM connector resistance is less than 2 ohms, go to step 23).
  22. Remove INT LPS fuse. Using DVOM, measure resistance of battery feed circuit (Orange wire) between fuse block and EBCM connector. If resistance is 0-2 ohms, go to step 34). If resistance is not 0-2 ohms, go to step 35).
  23. Turn ignition off. Using DVOM, measure resistance of switched ignition circuit (Pink wire) between fuse block and EBCM connector. If resistance is 0-2 ohms, go to step 36). If resistance is not 0-2 ohms, go to step 37).
  24. If ABS warning indicator is off constantly, proceed to SYMPTOM DIAGNOSTIC TEST "B", ABS WARNING INDICATOR INOPERATIVE in ANTI-LOCK BRAKE SYSTEM article. If ABS warning indicator illuminates, proceed to SYMPTOM DIAGNOSTIC TEST "A", ABS WARNING INDICATOR ON, NO DTCS STORED in ANTI-LOCK BRAKE SYSTEM article.
  25. Repair open or high resistance in ground circuit (Black wire). After repairs, go to step 1).
  26. Reinstall ERLS fuse. Repair short to ground in switched ignition circuit (Pink wire). After repairs, go to step 1).
  27. Repair short to ground in switched ignition circuit (Pink wire). Replace ERLS fuse. After repairs, go to step 1).
  28. Reinstall INT LPS fuse. Repair short to ground in battery feed circuit (Orange wire). After repairs, go to step 1).
  29. Repair short to ground in battery feed circuit (Orange wire). Replace INT LPS fuse. After repairs, go to step 1).
  30. Repair open or high resistance between positive battery terminal and battery feed circuit (Orange wire) of fuse block. After repairs, go to step 1).
  31. Repair open or high resistance in battery feed circuit (Orange wire). Reinstall INT LPS fuse. After repairs, go to step 1).
  32. Repair open or high resistance between positive battery terminal and switched ignition circuit (Pink wire) of fuse block. After repairs, go to step 1).
  33. Repair open or high resistance in switched ignition circuit (Pink wire). Reinstall ERLS fuse. After repairs, go to step 1).
  34. Repair open or high resistance between positive battery terminal and battery feed circuit (Orange wire) of fuse block. After repairs, go to step 1).
  35. Repair open or high resistance in battery feed circuit (Orange wire). Reinstall INT LPS fuse. After repairs, go to step 1).
  36. Repair open or high resistance between positive battery terminal and switched ignition circuit (Pink wire) of fuse block. After repairs, go to step 1).
  37. Repair open or high resistance in switched ignition circuit (Pink wire). Reinstall ERLS fuse. After repairs, go to step 1).
  38. Replace EBCM. Replace INT LPS fuse. After repairs, go to step 1).
  39. Replace EBCM. Replace ERLS fuse. After repairs, go to step 1).
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