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Home >> Lexus >> 1998 >> SC 400 >> Repair and Diagnosis >> Brakes >> Traction Control >> Traction Control System >> Circuit Tests >> DTC 43: Abs/TRAC Control System Malfunction (GS300) >> Diagnosis & Repair

Diagnosis & Repair

  1. Determine if ABS DTCs are present. See appropriate ANTI-LOCK BRAKE article. Repair ABS system as needed. If no DTCs are present, go to next step.
  2. Access TRAC ECU. Do not disconnect connectors. Turn ignition on. Backprobing, measure voltage between ground and terminal No. 4 (Light Green wire) on TRAC ECU T14 connector. If voltage is a 6 volt pulse, replace TRAC ECU. If voltage is not a 6 volt pulse, go to next step.
    NOTE: Voltage must be measured within 8 seconds of disconnecting TRAC ECU harness connector.
  3. Turn ignition off. Disconnect TRAC ECU T14 connector. Turn ignition on. Measure voltage between ground and terminal No. 4 (Light Green wire) on TRAC ECU T14 connector. If voltage is a 6-volt pulse, replace TRAC ECU. If voltage is not a 6-volt pulse, go to next step.
  4. Turn ignition off. Check for open or short in Light Green wire between ABS/TRAC ECU and TRAC ECU. Repair circuit as needed. If circuit is okay, replace TRAC ECU.
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