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Home >> Toyota >> 1997 >> Previa LE, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Tests W/Codes >> Circuit Tests >> DTC P0510: Closed Throttle Position (CTP) Switch Malfunction >> Diagnosis & Repair (Using OBD-II Scan Tool)
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Diagnosis & Repair (Using OBD-II Scan Tool)

  1. Ensure ignition is off. Disconnect TP sensor connector. Turn ignition on. Using DVOM, measure voltage between terminals No. 1 (Brown/Black wire) and No. 2 (Blue/Yellow wire) at TP sensor wiring harness connector. If voltage is 9-14 volts, replace TP sensor and retest. If voltage is not 9-14 volts, go to next step.
  2. Turn ignition off. Check for an open in wiring harness between TP sensor and ECM. See appropriate wiring diagram in WIRING DIAGRAMS article. Repair wiring as necessary. If wiring harness is okay, replace ECM and retest.
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