СИСТЕМА SFI, Diagnostic DTC:P0120, P0121, P0122, P0123, P0220, P0222, P0223, P2135

DTC Code DTC Name
P0120 Throttle / Pedal Position Sensor / Switch "A" Circuit Malfunction
P0121 Throttle / Pedal Position Sensor / Switch "A" Circuit Range / Performance Problem
P0122 Throttle / Pedal Position Sensor / Switch "A" Circuit Low Input
P0123 Throttle / Pedal Position Sensor / Switch "A" Circuit High Input
P0220 Throttle / Pedal Position Sensor / Switch "B" Circuit
P0222 Throttle / Pedal Position Sensor / Switch "B" Circuit Low Input
P0223 Throttle / Pedal Position Sensor / Switch "B" Circuit High Input
P2135 Throttle / Pedal Position Sensor / Switch "A" / "B" Voltage Correlation

DESCRIPTION

Tech Tips

These DTCs relate to the throttle position sensor.

The throttle position sensor is mounted on the throttle with motor body assembly, and detects the opening angle of the throttle valve. This sensor is a non-contact type sensor. It uses Hall-effect elements in order to yield accurate signals even in extreme driving conditions, such as at high speeds as well as very low speeds.

The throttle position sensor has 2 sensor circuits, VTA1 and VTA2 each of which transmits a signal. 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 in proportion to the throttle valve opening angle, and are transmitted to the VTA1 and VTA2 terminals of the ECM.

As the valve closes, the sensor output voltage decreases and as the valve opens, the 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. These signals are also used in calculations such as air fuel ratio correction, power increase correction and fuel-cut control.

A01A49XE01
DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0120 Throttle / Pedal Position Sensor / Switch "A" Circuit Malfunction The output voltage of VTA1 quickly fluctuates beyond the lower and upper malfunction thresholds for 2 seconds or more (1 trip detection logic).
  • Throttle position sensor (built into throttle body with motor assembly)

  • ECM

Comes on DTC stored
P0121 Throttle / Pedal Position Sensor / Switch "A" Circuit Range / Performance Problem The difference between the VTA1 and VTA2 voltages is less than 0.8 V, or higher than 1.6 V for 2 seconds (1 trip detection logic).
  • Throttle position sensor (built into throttle body with motor assembly)

  • Throttle position sensor circuit

  • ECM

Comes on DTC stored
P0122 Throttle / Pedal Position Sensor / Switch "A" Circuit Low Input The output voltage of VTA1 is 0.2 V or less for 2 seconds or more (1 trip detection logic).
  • Throttle position sensor (built into throttle body with motor assembly)

  • Short in VTA1 circuit

  • Open in VCTA circuit

  • ECM

Comes on DTC stored
P0123 Throttle / Pedal Position Sensor / Switch "A" Circuit High Input The output voltage of VTA1 is 4.54 V or higher for 2 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 VCTA and VTA1 circuits

  • ECM

Comes on DTC stored
P0220 Throttle / Pedal Position Sensor / Switch "B" Circuit The output voltage of VTA2 quickly fluctuates beyond the lower and upper malfunction thresholds for 2 seconds or more (1 trip detection logic).
  • Throttle position sensor (built into throttle body with motor assembly)

  • ECM

Comes on DTC stored
P0222 Throttle / Pedal Position Sensor / Switch "B" Circuit Low Input The output voltage of VTA2 is 1.75 V or less for 2 seconds or more (1 trip detection logic).
  • Throttle position sensor (built into throttle body with motor assembly)

  • Short in VTA2 circuit

  • Open in VCTA circuit

  • ECM

Comes on DTC stored
P0223 Throttle / Pedal Position Sensor / Switch "B" Circuit High Input The output voltage of VTA2 is 4.8 V or higher, and VTA1 is between 0.2 V and 2.02 V for 2 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 VCTA and VTA2 circuits

  • ECM

Comes on DTC stored
P2135 Throttle / Pedal Position Sensor / Switch "A" / "B" Voltage Correlation

Either of the following conditions is met (1 trip detection logic):

(a) The difference between the output voltages of VTA1 and VTA2 is 0.02 V or less for 0.5 seconds or more.

(b) The output voltage of VTA1 is 0.2 V or less, and VTA2 is 1.75 V or less for 0.4 seconds or more.


  • Short between VTA1 and VTA2 circuits

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

  • ECM

Comes on DTC stored

Tech Tips


  • When any of these DTCs are stored, check the throttle valve opening angle by entering the following menus: Powertrain / Engine and ECT / Data List / All Data / 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.

Reference (Normal Condition)
GTS Display Accelerator Pedal Fully Released Accelerator Pedal Fully Depressed
Throttle Position No.1 0.5 to 1.1 V 3.2 to 4.8 V
Throttle Position No.2 2.1 to 3.1 V 4.6 to 4.98 V

MONITOR DESCRIPTION

The ECM uses the throttle position sensor to monitor the throttle valve opening angle. There are several checks that the ECM performs to confirm the proper operation of the throttle position sensor.



CONFIRMATION DRIVING PATTERN

A01HLM2E33

  1. Connect the GTS to the DLC3.

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

  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

  4. Turn the engine switch off and wait for at least 30 seconds.

  5. Turn the engine switch on (IG) and turn the GTS on [A].

  6. Start the engine.

  7. With the vehicle stationary, fully depress and release the accelerator pedal [B].

  8. Idle the engine for 2 seconds or more [C].

  9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [D].

  10. Read the pending DTCs.

    Tech Tips


    • If a pending DTC is output, the system is malfunctioning.

    • If a pending DTC is not output, perform the following procedure.

  11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

  12. Input the DTC: P0120, P0121, P0122, P0123, P0220, P0222, P0223 or P2135.

  13. Check the DTC judgment result.

    GTS Display Description
    NORMAL
    • DTC judgment completed

    • System normal

    ABNORMAL
    • DTC judgment completed

    • System abnormal

    INCOMPLETE
    • DTC judgment not completed

    • Perform driving pattern after confirming DTC enabling conditions

    N/A
    • Unable to perform DTC judgment

    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    Tech Tips


    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.

    • If the judgment result shows INCOMPLETE or N/A, perform steps [B] through [D] again.

FAIL-SAFE

When any of these DTCs or other DTCs relating to Electronic Throttle Control System (ETCS) malfunctions are stored, the ECM enters fail-safe mode. During fail-safe mode, the ECM cuts the current to the throttle actuator, and the throttle valve is returned to a 7° throttle angle by the return spring. The ECM then adjusts the engine output by controlling the fuel injection (intermittent fuel-cut) and ignition timing, in accordance with the accelerator pedal angle, to allow the vehicle to continue operating at a minimal speed. If the accelerator pedal is depressed firmly and gently, the vehicle can be driven slowly.

Fail-safe mode continues until a pass condition is detected, and the engine switch is then turned off.

WIRING DIAGRAM

A01A3BLE28
*a Throttle Position Sensor (Built into Throttle Body with Motor Assembly)

CAUTION / NOTICE / HINT

Tech Tips

Read freeze frame data using the GTS. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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.

PROCEDURE


  1. READ VALUE USING GTS (THROTTLE POSITION SENSOR)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

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


      Powertrain > Engine and ECT > Data List
      Tester Display
      Throttle Position No.1
      Throttle Position No.2
    5. Read the values displayed on the GTS.

      Result
      When Accelerator Pedal Fully Released When Accelerator Pedal Fully Depressed Trouble Area Proceed to

      Throttle Position No.1

      (VTA1)

      Throttle Position No.2

      (VTA2)

      Throttle Position No.1

      (VTA1)

      Throttle Position No.2

      (VTA2)

      0 to 0.2 V 0 to 0.2 V 0 to 0.2 V 0 to 0.2 V VCTA circuit open A
      4.5 to 4.98 V 4.5 to 5.0 V 4.5 to 5.0 V 4.5 to 5.0 V ETA circuit open
      0 to 0.2 V, or 4.5 to 4.98 V

      2.1 to 3.1 V

      (Fail-safe)

      0 to 0.2 V, or 4.5 to 4.98 V

      2.1 to 3.1 V

      (Fail-safe)

      VTA1 circuit open or shorted to ground

      0.6 to 1.4 V

      (Fail-safe)

      0 to 0.2 V, or 4.5 to 4.98 V

      0.6 to 1.4 V

      (Fail-safe)

      0 to 0.2 V, or 4.5 to 4.98 V VTA2 circuit open or shorted to ground
      0.5 to 1.1 V 2.1 to 3.1 V

      3.2 to 4.8 V

      (Not fail-safe)

      4.6 to 4.98 V

      (Not fail-safe)

      Throttle position sensor circuit normal B

      Tech Tips


      • DTC P0121 is stored when the VTA1 and VTA2 output voltages are not consistent with the sensor characteristics. Therefore, check the freeze frame data when this DTC is stored. Use the following formula to confirm the relative differences in voltage.

        Characteristic Sensor Output
        VTA2 x 0.8 is approximately equal to VTA1 + 1.11 V
        VTA1: Throttle Position No.1
        VTA2: Throttle Position No.2
      • If DTC P0121 is output, proceed to "Check Harness And Connector (Throttle Position Sensor - ECM)".


    B
    A
  2. CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)


    1. Disconnect the C7 throttle with motor body assembly connector.

    2. Disconnect the C30 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C7-5 (VC) - C30-13 (VCTA) Always Below 1 Ω
      C7-6 (VTA) - C30-15 (VTA1) Always Below 1 Ω
      C7-4 (VTA2) - C30-16 (VTA2) Always Below 1 Ω
      C7-3 (E2) - C30-14 (ETA) Always Below 1 Ω
      C7-5 (VC) or C30-13 (VCTA) - Body ground Always 10 kΩ or higher
      C7-6 (VTA) or C30-15 (VTA1) - Body ground Always 10 kΩ or higher
      C7-4 (VTA2) or C30-16 (VTA2) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG
    OK
  3. INSPECT ECM (VC VOLTAGE)

    A01A510C16
    *a

    Front view of wire harness connector

    (to Throttle Body with Motor Assembly)


    1. Disconnect the throttle body with motor assembly connector.

    2. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      C7-5 (VC) - C7-3 (E2) Engine switch on (IG) 4.5 to 5.5 V
      Result
      Proceed to
      OK
      NG

    NG
    OK
  4. REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY


    1. Replace the throttle body with motor assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT
  5. CHECK WHETHER DTC OUTPUT RECURS (THROTTLE POSITION SENSOR DTCS)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs Click here.


      Powertrain > Engine and ECT > Clear DTCs
    5. Turn the engine switch off and wait for at least 30seconds.

    6. Turn the engine switch on (IG).

    7. Turn the GTS on.

    8. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

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


      Powertrain > Engine and ECT > Trouble Codes
    10. Read the DTCs.

      Result
      Result Proceed to
      DTC P0120, P0121, P0122, P0123, P0220, P0222, P0223, and/or P2135 are output A
      DTC is not output B

    A
    B