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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 Lexus Scan Tester)

Diagnosis & Repair Procedure (Using Lexus Scan Tester)

  1. Connect Lexus scan tester to Data Link Connector (DLC) No. 3 connector. See Figure. Disconnect TP sensor connector. Connect a jumper wire between Brown and Green wires at TP sensor harness connector. Turn ignition on. Turn scan tester on. Using scan tester, read CTP switch signal. If CTP switch signal is off, remove jumper wire and go to next step. If CTP switch signal is on, check TP sensor connector. Repair as necessary and retest. If connector is okay, replace TP sensor.
  2. Access ECM behind glove box. Turn ignition off. Connect a jumper wire between terminals No. 32 (Green wire) at ECM E14 connector and No. 22 (Brown wire) at ECM E13 connector. See Figure. Turn ignition on. Using scan tester, read CTP switch signal. If CTP switch signal is off, replace ECM and retest. If CTP switch signal is on, locate and repair open circuit between ECM and TP sensor.
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