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Diagnostic System Check

  1. Turn ignition off. Reconnect all previously disconnected components. Install scan tool. Turn ignition on, with engine off. If scan tool communicates with EBTCM, go to next step. If scan tool does not communicate with EBTCM, proceed to TEST "E", NO COMMUNICATION WITH EBTCM.
  2. Road test vehicle for several minutes on several different road surfaces performing several turns reaching speed of at least 15 MPH. Using scan tool, display ABS/TCS DTCs. If any current DTCs are set, go to appropriate DTC for diagnosis. If no current DTCs are set, go to next step.
  3. Remove scan tool. Turn ignition off. Turn ignition on, with engine off. If ABS indicator illuminates for about 3 seconds and then goes out, go to next step. If ABS indicator does not illuminate, go to step 5).
  4. Turn ignition off. Turn ignition on, with engine off. If TC indicator illuminates for about 3 seconds and then goes out, go to step 7). If TC indicator does not illuminate, go to step 6).
  5. If ABS indicator remains illuminated, proceed to TEST "A", ABS INDICATOR ON WITH NO DTCS SET. If ABS indicator does not illuminate, proceed to TEST "B", ABS INDICATOR INOPERATIVE WITH NO DTCS SET.
  6. If TC indicator remains illuminated, proceed to TEST "C", TC INDICATOR ON WITH NO DTCS SET. If TC indicator does not illuminate, proceed to TEST "D", TC INDICATOR INOPERATIVE WITH NO DTCS SET.
  7. If any history DTCs are set, go to next step. If no history DTCs are set, go to step 9).
  8. Go to appropriate history DTC for diagnosis. Investigate conditions required for DTC to set. Drive vehicle for several minutes while monitoring scan tool for ABS/TCS DTCs. If history DTC sets as current while driving vehicle, go to appropriate DTC for diagnosis. If history DTC does not set as current while driving, go to next step.
  9. If brakes exhibit any symptoms of improper mechanical operation and/or BRAKE warning indicator illuminates, diagnose brake system. See BRAKE SYSTEM article. If brakes do not exhibit any symptoms of improper mechanical operation and/or BRAKE warning indicator does not illuminate, system is okay.
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