ECD SYSTEM (w/o 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 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 inputs used for EGR control, etc.

A0158OLE01
P0122
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Ignition switch ON for 3 seconds Throttle position sensor (for Bank 1) output (VLU) is less than 0.2 V for 3 seconds (1 trip detection logic).

  • Throttle position sensor (for Bank 1)

  • Open or short in VLU circuit

  • Open in VC circuit

  • ECM
P0123
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Ignition switch ON for 3 seconds Throttle position sensor (for Bank 1) output (VLU) is more than 4.8 V for 3 seconds (1 trip detection logic).

  • Throttle position sensor (for Bank 1)

  • Open in E2 circuit

  • VC and VLU circuits are short-circuited

  • ECM
P0222
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Ignition switch ON for 3 seconds Throttle position sensor (for Bank 2) output (VLU2) is less than 0.2 V for 3 seconds (1 trip detection logic).

  • Throttle position sensor (for Bank 2)

  • Open or short in VLU2 circuit

  • Open in VC circuit

  • ECM
P0223
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Ignition switch ON for 3 seconds Throttle position sensor (for Bank 2) output (VLU2) is more than 4.8 V for 3 seconds (1 trip detection logic).

  • Throttle position sensor (for Bank 2)

  • Open in E2 circuit

  • VC and 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.

A015E23E04

WIRING DIAGRAM

A0159ORE03

INSPECTION PROCEDURE

Note

After replacing the ECM, the new ECM needs registration Click here and initialization Click here.

Tech Tips

Read freeze frame data using the intelligent tester. 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)

    A015BZPE06

    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 (Check for Open)
      for Bank 1 (LHD)
      Tester Connection Condition Specified Condition
      C83-1 (VC) - C45-91 (VCVL) Always Below 1 Ω
      C83-3 (VTA) - C45-93 (VLU) Always Below 1 Ω
      C83-2 (E2) - C45-92 (EVLU) Always Below 1 Ω
      for Bank 2 (LHD)
      Tester Connection Condition Specified Condition
      C84-1 (VC) - C45-91 (VCVL) Always Below 1 Ω
      C84-3 (VTA2) - C45-103 (VLU2) Always Below 1 Ω
      C84-2 (E2) - C45-92 (EVLU) Always Below 1 Ω
      for Bank 1 (RHD)
      Tester Connection Condition Specified Condition
      C83-1 (VC) - C46-91 (VCVL) Always Below 1 Ω
      C83-3 (VTA) - C46-93 (VLU) Always Below 1 Ω
      C83-2 (E2) - C46-92 (EVLU) Always Below 1 Ω
      for Bank 2 (RHD)
      Tester Connection Condition Specified Condition
      C84-1 (VC) - C46-91 (VCVL) Always Below 1 Ω
      C84-3 (VTA2) - C46-103 (VLU2) Always Below 1 Ω
      C84-2 (E2) - C46-92 (EVLU) Always Below 1 Ω
      Standard Resistance (Check for Short)
      for Bank 1 (LHD)
      Tester Connection Condition Specified Condition
      C83-1 (VC) or C45-91 (VCVL) - Body ground Always 10 kΩ or higher
      C83-3 (VTA) or C45-93 (VLU) - Body ground Always 10 kΩ or higher
      C83-2 (E2) or C45-92 (EVLU) - Body ground Always 10 kΩ or higher
      for Bank 2 (LHD)
      Tester Connection Condition Specified Condition
      C84-1 (VC) or C45-91 (VCVL) - Body ground Always 10 kΩ or higher
      C84-3 (VTA2) or C45-103 (VLU2) - Body ground Always 10 kΩ or higher
      C84-2 (E2) or C45-92 (EVLU) - Body ground Always 10 kΩ or higher
      for Bank 1 (RHD)
      Tester Connection Condition Specified Condition
      C83-1 (VC) or C46-91 (VCVL) - Body ground Always 10 kΩ or higher
      C83-3 (VTA) or C46-93 (VLU) - Body ground Always 10 kΩ or higher
      C83-2 (E2) or C46-92 (EVLU) - Body ground Always 10 kΩ or higher
      for Bank 2 (RHD)
      Tester Connection Condition Specified Condition
      C84-1 (VC) or C46-91 (VCVL) - Body ground Always 10 kΩ or higher
      C84-3 (VTA2) or C46-103 (VLU2) - Body ground Always 10 kΩ or higher
      C84-2 (E2) or C46-92 (EVLU) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  2. CHECK ECM TERMINAL VOLTAGE (VC TERMINAL)


    1. A0155PWE03

      Disconnect the throttle position sensor connector.

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

      Standard Voltage
      for Bank 1
      Tester Connection Switch Condition Specified Condition
      C83-1 (VC) - C83-2 (E2) Ignition switch ON 4.5 to 5.5 V
      for Bank 2
      Tester Connection Switch Condition Specified Condition
      C84-1 (VC) - C84-2 (E2) Ignition switch ON 4.5 to 5.5 V

    NG

    REPLACE ECM Click here

    OK

  3. REPLACE DIESEL THROTTLE BODY ASSEMBLY (for Bank 1 or Bank 2)


    1. Replace the diesel throttle body assembly (for Bank 1 or Bank 2) Click here.


    NEXT

  4. READ VALUE USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON and turn the tester on.

    3. Clear the DTCs Click here.

    4. Enter the following menus: Powertrain / Engine / Data List / Actual Throttle position or Actual Throttle position #2.

    5. Check the movement of the throttle valve when idling the engine after starting it from ignition switch ON.

      OK
      Condition Tester Display
      Ignition switch ON -5 to 5%
      Idling 0 to 90%

    OK

    END

    NG

    REPLACE ECM Click here

  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


    NEXT

  7. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the intelligent tester to the DLC3.

    2. Clear the DTCs Click here.

    3. Turn the ignition switch off.

    4. Turn the ignition switch to ON for 3 seconds.

    5. Enter the following menus: Powertrain / Engine / DTC.

    6. Confirm that the DTC is not output again.


    NEXT

    END