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Diagnostic System Check

  1. Install Tech 2 scan tool. Turn ignition on. Using scan tool, attempt to display DTCs. If any DTCs are present, diagnose affected DTCs. If DTCs are not present, go to next step.
  2. Turn ignition off. Turn ignition to RUN position. Observe ABS indicator light. If indicator light illuminates for 3 seconds then go off, go to next step. If not, go to step 6).
  3. Turn ignition off. Turn ignition to RUN position. Observe TCS indicator light. If indicator light illuminates for 3 seconds then goes off, go to next step. If not, go to step 6).
  4. Road test vehicle for several minutes over different road surfaces while making several turns and at speed of at least 15 MPH. Observe if ABS or TCS indicator illuminates. If ABS or TCS indicator light illuminates, go to step 6). If neither indicator light illuminates, go to next step.
  5. If brake did not operate properly or if BRAKE indicator light illuminated, diagnose hydraulic brake system. See BRAKE SYSTEM article. If brakes were okay and indicator light did not illuminate, system is operating properly.
  6. Using scan tool, attempt to display DTCs. If scan tool communicates with EBTCM, go to next step. If not, go to step 8).
  7. Attempt to display DTCs. If any DTCs are present, diagnose affected DTCs. See DIAGNOSTIC TROUBLE CODES (DTCS)  . If DTCs are not present, system is okay.
  8. Turn ignition off. Disconnect and reconnect EBTCM harness connector. Attempt to establish communication with EBTCM. If communication is established, repeat step 1). If not, diagnose Data Link Connector (DLC) system. See DATA LINK CONNECTOR article in WIRING DIAGRAMS section.
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