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Home >> Lexus >> 1995 >> LS 400 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - OBD-II >> Diagnostic Testing >> Code P0510: Closed Throttle Position (CTP) Switch Malfunction >> Diagnosis & Repair Procedure (Using OBD-II Scan Tester)

Diagnosis & Repair Procedure (Using OBD-II Scan Tester)

  1. Disconnect TP sensor connector. Turn ignition on. Using DVOM, measure voltage between Green wire and Brown wire at TP sensor harness connector. If voltage is not 9-14 volts, check for open circuit in Green and Brown wires between ECM and TP sensor. Repair as necessary.
  2. If wiring is okay, replace ECM. If voltage is 9-14 volts, check TP sensor connector. Repair as necessary. If connector is okay, replace TP sensor and retest.
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