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SFI SYSTEM, Diagnostic DTC:P0121, P0122, P0123, P0221, P0222, P0223

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DTC Code DTC Name
P0121 Throttle Pedal Position Sensor / Switch "A" Circuit Range / Performance
P0122 Throttle / Pedal Position Sensor / Switch "A" Circuit Low Input
P0123 Throttle / Pedal Position Sensor / Switch "A" Circuit High Input
P0221 Throttle / Pedal Position Sensor / Switch "B" Circuit Range / Performance Problem
P0222 Throttle / Pedal Position Sensor / Switch "B" Circuit Low Input
P0223 Throttle / Pedal Position Sensor / Switch "B" Circuit High Input
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DESCRIPTION

Tip:

  • This ETCS (Electrical Throttle Control System) does not use a throttle cable.

  • These DTCs relate to the throttle position sensor.

The throttle position sensor is mounted on the throttle body with motor assembly, and detects the opening angle of the throttle valve.

The throttle body with motor assembly sensor has 2 sensor circuits which each transmits a signal, VTA1 and VTA2. VTA1 is used to detect the throttle valve angle and VTA2 is used to detect malfunctions in VTA1. The sensor signal voltages vary between 0 V and 5 V. The VTA1 sensor signal voltage varies in proportion to the throttle valve opening angle, and is transmitted to the VTA1 terminals of the ECM.

As the valve closes, the VTA1 sensor output voltage decreases, and as the valve opens, the VTA1 sensor output voltage increases. The ECM calculates the throttle valve opening angle according to these signals and controls the throttle actuator in response to driver inputs.

DTC No. DTC Detection Condition Trouble Area
P0121

  • Both of the following conditions are met for 0.4 seconds (1 trip detection logic):


    • The difference between the sensor output of VTA1 and VTA2 is 6.3% or more.

    • The difference between the sensor output of VTA1 and assumed throttle angle with manifold absolute pressure sensor is 9% or more.

  • Throttle position sensor (built into throttle body with motor assembly)

  • Throttle position sensor circuit

  • ECM
P0122 Output voltage of VTA1 0.2 V or less for 0.14 seconds or more (1 trip detection logic).

  • Throttle position sensor (built into throttle body with motor assembly)

  • Short in VTA1 circuit

  • Open in VC circuit

  • ECM
P0123 Output voltage of VTA1 4.8 V or higher for 0.14 seconds or more (1 trip detection logic).

  • Throttle position sensor (built into throttle body with motor assembly)

  • Open in VTA1 circuit

  • Open in ETA circuit

  • Short between VC and VTA1 circuits

  • ECM
P0221

  • Both of the following conditions are met for 0.4 seconds (1 trip detection logic):


    • The difference between the sensor output of VTA1 and VTA2 is 6.3% or more.

    • The difference between the sensor output of VTA2 and assumed throttle angle with manifold absolute pressure sensor is 9% or more.

  • Throttle position sensor (built into throttle body with motor assembly)

  • ECM
P0222 Output voltage of VTA2 0.2 V or less for 0.14 seconds or more (1 trip detection logic).

  • Throttle position sensor (built into throttle body with motor assembly)

  • Short in VTA2 circuit

  • Open in VC circuit

  • ECM
P0223 Output voltage of VTA2 4.8 V or higher for 0.14 seconds or more (1 trip detection logic).

  • Throttle position sensor (built into throttle body with motor assembly)

  • Open in VTA2 circuit

  • Open in ETA circuit

  • Short between VC and VTA2 circuits

  • ECM
Note:

If any DTCs related to the crankshaft position sensor, throttle position sensor and accelerator pedal sensor assembly are output simultaneously, inspect the VC circuit of each component.

Tip:

  • When any of these DTCs are stored, check the throttle valve opening angle by entering the following menus: Powertrain / Engine and ECT / Data List / Throttle Position No. 1 and Throttle Position No. 2.


  • Throttle Position No. 1 is the VTA1 signal, and Throttle Position No. 2 is the VTA2 signal.

    Table 1. Reference (Normal Condition)
    Tester Display Accelerator Pedal Fully Released Accelerator Pedal Fully Depressed
    Throttle Position No. 1 0.6 to 1.1 V 4.2 to 4.54 V
    Throttle Position No. 2 3.9 to 4.4 V 0.46 to 0.76 V
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

Perform idle learning after replacing the ECM or throttle body with motor assembly (Click here).

Tip:

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, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

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PROCEDURE


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    READ VALUE USING GTS (THROTTLE POSITION NO. 1 AND THROTTLE POSITION NO. 2)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List / Throttle Position No. 1 and Throttle Position No. 2.

    5. Read the values displayed on the GTS.

      Table 2. Result
      When Accelerator Pedal Released When Accelerator Pedal Depressed Trouble Area Proceed to
      Throttle Position No. 1 Throttle Position No. 2 Throttle Position No. 1 Throttle Position No. 2
      4.8 to 4.98 V 0 to 0.2 V 4.8 to 4.98 V 0 to 0.2 V VC circuit open A
      4.8 to 4.98 V 0 to 0.2 V 4.8 to 4.98 V 0 to 0.2 V ETA circuit open

      0 to 0.2 V,

      or 4.8 to 4.98 V

      		 3.9 to 4.4 V

      0 to 0.2 V,

      or 4.8 to 4.98 V

      		 3.9 to 4.3 V VTA1 circuit open or ground short
      0.6 to 1.1 V

      0 to 0.2 V,

      or 4.8 to 4.98 V

      		 0.7 to 1.1 V

      0 to 0.2 V,

      or 4.8 to 4.98 V

      		 VTA2 circuit open or ground short
      0.6 to 1.1 V 3.9 to 4.4 V 4.2 to 4.54 V 0.46 to 0.76 V Throttle position sensor circuit normal B

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    CHECK HARNESS AND CONNECTOR (THROTTLE BODY WITH MOTOR ASSEMBLY - ECM)


    1. Disconnect the B29 throttle body with motor assembly connector.

    2. Disconnect the B97 ECM connector (for LHD).

    3. Disconnect the B101 ECM connector (for RHD).

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

      Standard Resistance
      Table 3. for LHD
      Tester Connection Condition Specified Condition
      B29-5 (VC) - B97-115 (VC) Always Below 1 Ω
      B29-6 (VTA) - B97-84 (VTA1) Always Below 1 Ω
      B29-4 (VTA2) - B97-83 (VTA2) Always Below 1 Ω
      B29-3 (E2) - B97-116 (ETA) Always Below 1 Ω
      B29-5 (VC) or B97-115 (VC) - Body ground Always 10 kΩ or higher
      B29-6 (VTA) or B97-84 (VTA1) - Body ground Always 10 kΩ or higher
      B29-4 (VTA2) or B97-83 (VTA2) - Body ground Always 10 kΩ or higher
      Table 4. for RHD
      Tester Connection Condition Specified Condition
      B29-5 (VC) - B101-115 (VC) Always Below 1 Ω
      B29-6 (VTA) - B101-84 (VTA1) Always Below 1 Ω
      B29-4 (VTA2) - B101-83 (VTA2) Always Below 1 Ω
      B29-3 (E2) - B101-116 (ETA) Always Below 1 Ω
      B29-5 (VC) or B101-115 (VC) - Body ground Always 10 kΩ or higher
      B29-6 (VTA) or B101-84 (VTA1) - Body ground Always 10 kΩ or higher
      B29-4 (VTA2) or B101-83 (VTA2) - Body ground Always 10 kΩ or higher

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

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    INSPECT ECM (VC VOLTAGE)


    1. A01VFJNE02

      Disconnect the throttle body with motor assembly connector.

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      B29-5 (VC) - B29-3 (E2) Ignition switch ON 4.5 to 5.5 V
      Table 5. Text in Illustration
      *a

      Front view of wire harness connector

      (to Throttle Body with Motor Assembly)

  4. Click here

    REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY


    1. Replace the throttle body with motor assembly (Click here).


  5. Click here

    CHECK WHETHER DTC OUTPUT RECURS (THROTTLE POSITION SENSOR DTCS)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Clear DTCs (Click here).

    5. Start the engine.

    6. With the vehicle stationary, fully depress and release the accelerator pedal.

    7. Idle the engine for 2 seconds or more.

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

    9. Read the DTCs.

      Table 6. Result
      Result Proceed to
      DTC P0121, P0122, P0123, P0221, P0222 and/or P0223 are output A
      DTC is not output B