ECD SYSTEM(w/ DPF), Diagnostic DTC:P0122, P0123, P0222, P0223

DTC Code DTC Name
P0122 Throttle / Pedal Position Sensor / Switch "A" Circuit Low Input
P0123 Throttle / Pedal Position Sensor / Switch "A" Circuit High Input
P0222 Throttle / Pedal Position Sensor / Switch "B" Circuit Low Input
P0223 Throttle / Pedal Position Sensor / Switch "B" Circuit High Input

DESCRIPTION

The throttle position sensor is mounted on the diesel throttle body assembly and detects the opening angle of the throttle valve. This sensor is an electronic sensor and uses Hall-effect elements.

When the throttle valve is fully closed, a voltage of approximately 0.7 V is applied to terminal VLU of the ECM. The voltage applied to terminal VLU of the ECM increases in proportion to the opening angle of the throttle valve and becomes approximately 3.5 to 4.0 V when the throttle valve is fully opened.

The ECM determines the vehicle driving conditions from the signals input to its VLU terminal. The data is one of the pieces of information used for EGR control, etc.

A01WQ29E09
*1 Throttle Position Sensor
*2 Magnet
*3 Hall IC
P0122 (Bank 1), P0222 (Bank 2)
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Engine switch on (IG) for 3 seconds

Throttle position sensor output (VLU, VLU2) is below 0.2 V for 3 seconds.

(1 trip detection logic)

  • Throttle position sensor

  • Open or short in VLU, VLU2 circuit

  • Open in VC circuit

  • ECM
P0123 (Bank 1), P0223 (Bank 2)
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Engine switch on (IG) for 3 seconds

Throttle position sensor output (VLU, VLU2) is higher than 4.8 V for 3 seconds.

(1 trip detection logic)

  • Throttle position sensor

  • Open in E2 circuit

  • VC and VLU, VLU2 circuits are short-circuited

  • ECM

Tech Tips

If DTC P0122, P0123, P0222 and/or P0223 is stored, the following symptoms may appear:


MONITOR DESCRIPTION

When the output voltage of the throttle position sensor deviates from the normal operating range (between 0.2 V and 4.8 V) for more than 3 seconds, the ECM interprets this as a malfunction of the sensor circuit and illuminates the MIL.

A01WRVRE11

WIRING DIAGRAM

A01WV13E10

CAUTION / NOTICE / HINT

Note


  • After replacing the ECM, the new ECM needs registration (See page ) and initialization Click here.

  • After replacing the fuel supply pump assembly, the ECM needs initialization Click here.

  • After replacing an injector assembly, the ECM needs registration Click here.

Tech Tips

Read freeze frame data using the GTS. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)


    1. Disconnect the throttle position sensor connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      C93-1 (VC) - C110-110 (VCVL) Always Below 1 Ω
      C93-3 (VTA) - C110-64 (VLU) Always Below 1 Ω
      C93-2 (E2) - C110-87 (EVLU) Always Below 1 Ω
      C94-1 (VC) - C110-110 (VCVL) Always Below 1 Ω
      C94-3 (VTA2) - C110-65 (VLU2) Always Below 1 Ω
      C94-2 (E2) - C110-87 (EVLU) Always Below 1 Ω
      C93-1 (VC) or C110-110 (VCVL) - Body ground Always 10 kΩ or higher
      C93-3 (VTA) or C110-64 (VLU) - Body ground Always 10 kΩ or higher
      C94-1 (VC) or C110-110 (VCVL) - Body ground Always 10 kΩ or higher
      C94-3 (VTA2) or C110-65 (VLU2) - Body ground Always 10 kΩ or higher
      Standard Resistance
      for RHD
      Tester Connection Condition Specified Condition
      C93-1 (VC) - C138-110 (VCVL) Always Below 1 Ω
      C93-3 (VTA) - C138-64 (VLU) Always Below 1 Ω
      C93-2 (E2) - C138-87 (EVLU) Always Below 1 Ω
      C94-1 (VC) - C138-110 (VCVL) Always Below 1 Ω
      C94-3 (VTA2) - C138-65 (VLU2) Always Below 1 Ω
      C94-2 (E2) - C138-87 (EVLU) Always Below 1 Ω
      C93-1 (VC) or C138-110 (VCVL) - Body ground Always 10 kΩ or higher
      C93-3 (VTA) or C138-64 (VLU) - Body ground Always 10 kΩ or higher
      C94-1 (VC) or C138-110 (VCVL) - Body ground Always 10 kΩ or higher
      C94-3 (VTA2) or C138-65 (VLU2) - Body ground Always 10 kΩ or higher

    4. Reconnect the throttle position sensor connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  2. CHECK ECM TERMINAL VOLTAGE (VC TERMINAL)


    1. A01WV6HE01
      Text in Illustration
      *A for Bank 1
      *B for Bank 2
      *a

      Front view of wire harness connector

      (to Throttle Position Sensor)

      Disconnect the throttle position sensor connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      C93-1 (VC) - C93-2 (E2) Engine switch on (IG) 4.5 to 5.5 V
      C94-1 (VC) - C94-2 (E2) Engine switch on (IG) 4.5 to 5.5 V

    3. Reconnect the throttle position sensor connector.


    NG

    REPLACE ECM Click here

    OK

  3. REPLACE DIESEL THROTTLE BODY ASSEMBLY

    When DTC P0122 or P0123 is output:


    • Replace the diesel throttle body assembly (for bank 1) Click here.

    When DTC P0222 or P0223 is output:


    • Replace the diesel throttle body assembly (for bank 2) Click here.


    NEXT

  4. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG) and turn the GTS on.

    3. Clear the DTCs Click here.

    4. Enter the following menus: Engine and ECT / Data List / Actual Throttle position, Actual Throttle position #2.

    5. Check the movement of the throttle valve when idling the engine after starting it from engine switch on (IG).

      OK
      Condition GTS Display
      Engine switch on (IG) 95 to 105%
      Idling 5 to 15%

    OK

    END

    NG

  5. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  6. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.


    NEXT

  7. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the GTS to the DLC3.

    2. Clear the DTCs Click here.

    3. Turn the engine switch off.

    4. Turn the engine switch on (IG) for 3 seconds.

    5. Enter the following menus: Engine and ECT / Trouble Codes.

    6. Confirm that the DTC is not output again.


    NEXT

    END