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HOMESERVICE MANUALSCHEVROLET1997FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISBRAKESTRACTION CONTROLANTI-LOCK BRAKE SYSTEM - P SERIESDIAGNOSISDIAGNOSTIC SYSTEM CHECKDIAGNOSTIC PROCEDURES
1997 Chevrolet Forward Control 5.7 R, Automatic

Diagnostic Procedures

1997 Chevrolet Forward Control 5.7 R, AutomaticSECTION Diagnostic Procedures
  1. Verify all EBCM connectors are connected properly. Install scan tool with proper cartridge. Turn ignition switch to RUN position. Using scan tool, select F0: DATA LIST. If data is being received from EBCM, go to step 7). If data is not received from EBCM, go to next step.
  2. Observe scan tool. If scan tool displays WAITING FOR DATA, go to next step.
  3. Ensure scan tool is properly connected to DLC. If connection is okay, go to next step. If not, go to step 5).
  4. Turn ignition off. Remove and inspect 10A brake fuse. If fuse is open, go to step 11). If fuse is okay, go to step 6).
  5. Reconnect scan tool to DLC connector and repeat step 1).
  6. Turn ignition off. Install brake fuse. Disconnect negative battery terminal. Disconnect 10-pin EBCM harness connector C1. Check resistance between negative battery terminal and 10-pin EBCM harness connector C1 terminal "J". If resistance is 0-2 ohms, go to step 14). If resistance is not 0-2 ohms, go to step 17).
  7. Using scan tool, select DTC(s). If DTC(s) are present, go to appropriate DTC test. If DTC(s) are not present, go to next step.
  8. Turn ignition off for 10 seconds. Turn ignition switch to RUN position. If ABS warning light illuminates for 3 seconds, and then goes off, go to next step. If not, go to step 10).
  9. Select DTC HISTORY. If DTC(s) are present, diagnose affected DTC(s). Go to DIAGNOSTIC TROUBLE CODES (DTC). If DTC(s) are not present, system is okay.
  10. Observe ABS warning light. If warning light stays on, go to TEST "B" under SYMPTOM TESTS . If warning light does not stay on, go to TEST "A" under SYMPTOM TESTS .
  11. Replace brake fuse. Turn ignition switch to RUN position for 10 seconds. Turn ignition off. Remove and inspect fuse. If fuse is blown, go to next step. If fuse is okay, go to step 19).
  12. Disconnect 10-pin EBCM harness connector C1. Replace brake fuse. Turn ignition switch to RUN position for 10 seconds. Turn ignition off. Remove and inspect fuse. If fuse is blown, go to step 20). If fuse is okay, go to next step.
  13. Inspect ignition and brake switch input circuits and 10-pin EBCM harness connector C1 for physical damage which could cause a short to ground with EBCM harness connector connected to EBCM. Repair as necessary. After repairs, reconnect all connectors. Turn ignition switch to RUN position for 10 seconds. Turn ignition off. Remove and inspect fuse. If fuse is blown, go to step 21). If fuse is okay, check for intermittent or poor connections.
  14. Reconnect negative battery terminal. Turn ignition switch to RUN position. Check voltage between 10-pin EBCM harness connector C1 terminal "A" and ground. If voltage reading is 10-15 volts, go to next step. If not, go to step 22).
  15. Turn ignition off. Disconnect positive battery terminal. Turn ignition switch to RUN position. Check resistance between positive battery cable and 10-pin EBCM connector C1, terminal "A". If resistance is 0-2 ohms, go to next step. If resistance is not 0-2 ohms, go to step 22).
  16. Inspect EBCM and EBCM harness connector terminals for poor contact. Inspect battery terminals and battery cable terminals for poor connection. Repair as necessary. After repairs, go to step 24). If connections or terminals are okay, go to step 25).
  17. Repair open or high resistance in EBCM ground circuit. See WIRING DIAGRAMS . After repairs, repeat step 1).
  18. Repair short to ground in brakelight control circuit. After repairs, repeat step 1).
  19. Check and repair short to ground in battery feed circuit. After repairs, install fuse and repeat step 1).
  20. Check and repair short to ground in ignition input or battery circuit to EBCM. See WIRING DIAGRAMS . After repairs, repeat step 1).
  21. Replace EBCM and brake fuse. After repairs, repeat step 1).
  22. Repair open in ignition input or battery circuit to EBCM. See WIRING DIAGRAMS . After repairs, repeat step 1).
  23. Repair open or high resistance in ignition input circuit or battery circuit to EBCM. After repairs, repeat step 1).
  24. Replace terminals or repair poor connection. After repairs, repeat step 1).
  25. Reconnect EBCM harness connectors and battery terminals. If communications cannot be established between scan tool and EBCM, try scan tool on similar vehicle with the same system to determine if scan too is malfunctioning or if Class 2 data line is faulty. See WIRING DIAGRAM article. Repair or replace as necessary.
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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.