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Home >> Lexus >> 2007 >> RX 400h AWD >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Vehicle Control (P310) - RX400H - DTC P0AA1-231 Through U0424-537 >> DTC P2122-104 Throttle / Pedal Position Sensor / Switch "D" Circuit Low Input; DTC P2123-105 Throttle / Pedal Position Sensor / Switch "D" Circuit High Input; DTC P2127-107 Throttle / Pedal Position Sensor / Switch "E" Circuit Low Input; DTC P2128-108 Throttle / Pedal Position Sensor / Switch "E" Circuit High Input >> Inspection Procedure

Inspection Procedure

  1. READ VALUE OF INTELLIGENT TESTER (ACCEL POS #1 AND #2) 
    1. Connect the intelligent tester to the DLC3.
    2. Turn the ignition switch to the ON position.
    3. Select the following menu items: DIAGNOSIS / OBD/ MOBD / HV ECU / DTAT LIST / ACCEL POS #1 and #2.
    4. Read the voltage for the accelerator pedal position sensor data.
      Fig 1: Depressing Accelerator Pedal
      G05009624Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Result 

    DTC RESULT DESCRIPTION

    Accelerator Pedal ACCEL POS #1 ACCEL POS #2
    Released 0.4 to 1.4 V 1.0 to 2.2 V
    Depressed 3.1 to 4.6 V 3.9 to 4.8 V

    OK: CHECK FOR INTERMITTENT PROBLEMS 

    NG: Go to next step 

  2. INSPECT HYBRID VEHICLE CONTROL ECU 
    1. Disconnect the A12 accelerator pedal position sensor connector.
    2. Turn the ignition switch to the ON position.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      VCP1 (H34-24) - EP1 (H34-33) 4.5 to 5.5 V
      VCP2 (H34-31) - EP2 (H34-32) 4.5 to 5.5 V

    NG: REPLACE HYBRID VEHICLE CONTROL ECU 

    Fig 2: Identifying Hybrid Vehicle Control ECU Connectors
    G05278759Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  3. INSPECT HYBRID VEHICLE CONTROL ECU 
    1. Connect the accelerator pedal position sensor connector.
    2. Turn the ignition switch to the ON position.
    3. Measure the voltage according to the value(s) in the table below.
      Fig 3: Identifying Hybrid Vehicle Control ECU Connector
      G05278760Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard Voltage 

    STANDARD VOLTAGE SPECIFICATIONS

    Pedal Position VPA (H34-25) - EP1 (H34-33) VPA2 (H34-26) - EP2 (H34-32)
    Released 0.4 to 1.4 V 1.0 to 2.2 V
    Depressed 3.1 to 4.6 V 3.9 to 4.8 V

    OK: REPLACE HYBRID VEHICLE CONTROL ECU 

    NG: Go to next step 

  4. CHECK HARNESS AND CONNECTOR (HV CONTROL ECU - ACCELERATOR PEDAL POSITION SENSOR) 
    1. Turn the ignition switch OFF.
    2. Disconnect the H34 HV control ECU connector.
    3. Disconnect the A12 accelerator pedal position sensor connector.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      VPA (H34-25) - Body ground Below 1 V
      VCP1 (H34-24) - Body ground Below 1 V
      EP1 (H34-33) - Body ground Below 1 V
      VPA2 (H34-26) - Body ground Below 1 V
      VCP2 (H34-31) - Body ground Below 1 V
      EP2 (H34-32) - Body ground Below 1 V
    5. Turn the ignition switch OFF.
    6. Measure the resistance according to the value(s) in the table.
      Fig 4: Identifying Terminals Of Accelerator Pedal Position Sensor Connector
      G05278761Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance (Check for open) 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      VPA (H34-25) - VPA1 (A12-6) Below 1 Ω
      VCP1 (H34-24) - VCP1 (A12-4) Below 1 Ω
      EP1 (H34-33) - EP1 (A12-5) Below 1 Ω
      VPA2 (H34-26) - VPA2 (A12-3) Below 1 Ω
      VCP2 (H34-31) - VCP2 (A12-1) Below 1 Ω
      EP2 (H34-32) - EP2 (A12-2) Below 1 Ω

      Standard Resistance (Check for short) 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      VPA (H34-25) or VPA1 (A12-6) - Body ground 10 kΩ or higher
      VCP1 (H34-24) or VCP1 (A12-4) - Body ground 10 kΩ or higher
      EP1 (H34-33) or EP1 (A12-5) - Body ground 10 kΩ or higher
      VPA2 (H34-26) or VPA2 (A12-3) - Body ground 10 kΩ or higher
      VCP2 (H34-31) or VCP2 (A12-1) - Body ground 10 kΩ or higher
      EP2 (H34-32) or EP2 (A12-2) - Body ground 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE ACCELERATOR PEDAL ROD ASSEMBLY 

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