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Diagnostic System Check

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 1999 Pontiac Grand Prix, 1999 Pontiac Firebird, 1999 Oldsmobile Intrigue, 1999 Chevrolet Camaro, and 1998 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
  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.
  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. If ABS indicator does not illuminate, proceed to TEST B.
  6. If TC indicator remains illuminated, proceed to TEST C. If TC indicator does not illuminate, proceed to TEST D.
  7. If any history DTCs are set, go to next step. If no history DTCs are set, system is okay.
  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, system is okay.
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