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Home >> Lexus >> 2000 >> SC 400 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1128: Throttle Control Motor Lock Malfunction >> Diagnosis & Repair

Diagnosis & Repair

  1. Disconnect throttle control motor connector. Throttle control motor is located between accelerator cable and throttle body. Using an ohmmeter, measure resistance between throttle control motor connector terminals No. 1 (Green wire) and No. 2 (Red wire). Resistance should be .3-100.0 ohms at 68°F (20°C). If resistance is not as specified, replace throttle control motor. If resistance is as specified, go to next step.
  2. Visually inspect throttle valve for foreign material. Clean throttle valve as necessary. If throttle valve is clean, replace throttle body.
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