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Home >> Scion >> 2005 >> xA Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> Testing & Diagnosis >> SFI System >> DTC P0120, P0122, P0123: Throttle/Pedal Position Sensor/Switch "A" Circuit, Throttle/Pedal Position Sensor/Switch "A" Circuit Low Input , Throttle/Pedal Position Sensor/Switch "A" Circuit High Input >> Inspection Procedure >> OBD II Scan Tool (excluding the Hand-Held Tester):
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OBD II Scan Tool (excluding the Hand-Held Tester):

  1. INSPECT THROTTLE POSITION SENSOR 
    1. Disconnect the T1 Throttle Position (TP) sensor connector.
    2. Measure the resistance between the terminals of the TP sensor.

      Standard: 

      TESTER CONNECTIONS SPECIFICATIONS

      Tester Connections Throttle Valve Positions Specified Conditions
      VC (T1-2) - E2 (T1-1) - Between 2.5 kΩ and 5.9 kΩ
      VTA (T1-3) - E2 (T1-1) Fully closed Between 0.2 kΩ and 5.7 kΩ
      VTA (T1-3) - E2 (T1-1) Fully open Between 2.0 kΩ and 10.2 kΩ.
    3. Reconnect the TP sensor connector.
      Fig 1: Disconnecting T1 Throttle Position (TP) Sensor Connector
      G03196163Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG : REPLACE THROTTLE POSITION SENSOR 
    2. OK : GO TO NEXT STEP 
  2. CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM) 
    1. Disconnect the E3 ECM connector.
    2. Measure the resistance between the terminals of the E3 ECM connector.

      Standard: 

      TESTER CONNECTIONS SPECIFICATIONS

      Tester Connections Throttle valve Positions Specified Conditions
      VCC (E3-18) - E2 (E3-28) - Between 2.5 kΩ and 5.9 kΩ
      VTA (E3-21) - E2 (E3-28) Fully closed Between 0.2 kΩ and 5.7 kΩ
      VTA (E3-21) - E2 (E3-28) Fully open Between 2.0 kΩ and 10.2 kΩ
    3. Check the resistance.

      Standard (Check for short): 

      TESTER CONNECTIONS SPECIFICATIONS

      Tester Connections Specified Conditions
      VCC (E3-18) - Body ground 10 kΩ or higher
      VTA (E3-28) - Body ground 10 kΩ or higher
    4. Reconnect the ECM connector.
      Fig 2: Disconnecting E3 ECM Connector
      G03196164Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK : REPLACE ECM (See  REPLACEMENT  ) 
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