DTC    P0120    Throttle / Pedal Position Sensor / Switch "A" Circuit Malfunction

DTC    P0121    Throttle / Pedal Position Sensor / Switch "A" Circuit Range / Performance Problem

DTC    P0122    Throttle / Pedal Position Sensor / Switch "A" Circuit Low Input

DTC    P0123    Throttle / Pedal Position Sensor / Switch "A" Circuit High Input

DTC    P0220    Throttle / Pedal Position Sensor / Switch "B" Circuit

DTC    P0222    Throttle / Pedal Position Sensor / Switch "B" Circuit Low Input

DTC    P0223    Throttle / Pedal Position Sensor / Switch "B" Circuit High Input

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

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DESCRIPTION

HINT:
These DTCs relate to the Throttle Position (TP) sensor.

The Throttle Position (TP) sensor is mounted on the throttle body assembly, and detects the opening angle of the throttle valve. This sensor is a non-contact type. It uses Hall-effect elements in order to yield accurate signals even in extreme driving conditions such as at high speeds and very low speeds.
The TP sensor has two 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 in proportion to the throttle valve opening angle, and are transmitted to the VTA 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.

A209120E07


DTC No.
DTC Detection Condition
Trouble Area
P0120
Output voltage of VTA1 quickly fluctuates beyond the lower and upper malfunction thresholds for 2 seconds when the accelerator pedal is depressed (1 trip detection logic).
  1. Throttle position sensor (built into throttle body assembly)
  2. ECM
P0121
Difference between VTA1 and VTA2 voltages is less than 0.8 V, or more than 1.6 V for 2 seconds (1 trip detection logic).
  1. Throttle position sensor (built into throttle body assembly)
  2. Throttle position sensor circuit
  3. ECM
P0122
Output voltage of VTA1 0.2 V or less for 2 seconds when accelerator pedal depressed
(1 trip detection logic)
  1. Throttle position sensor (built into throttle body assembly)
  2. Short in VTA1 circuit
  3. Open in VC circuit
  4. ECM
P0123
Output voltage of VTA1 is 4.54 V or higher for 2 seconds when the accelerator pedal is depressed (1 trip detection logic).
  1. Throttle position sensor (built into throttle body assembly)
  2. Open in VTA1 circuit
  3. Open in E2 circuit
  4. Short between VC and VTA1 circuits
  5. ECM
P0220
Output voltage of VTA2 quickly fluctuates beyond the lower and upper malfunction thresholds for 2 seconds when the accelerator pedal is depressed (1 trip detection logic).
  1. Throttle position sensor (built into throttle body assembly)
  2. ECM
P0222
Output voltage of VTA2 is 1.75 V or less for 2 seconds when the accelerator pedal is depressed (1 trip detection logic).
  1. Throttle position sensor (built into throttle body assembly)
  2. Short in VTA2 circuit
  3. Open in VC circuit
  4. ECM
P0223
Output voltage of VTA2 is 4.8 V or higher, and VTA1 is between 0.2 V and 2.02 V for 2 seconds when the accelerator pedal is depressed (1 trip detection logic).
  1. Throttle position sensor (built into throttle body assembly)
  2. Open in VTA2 circuit
  3. Open in E2 circuit
  4. Short between VC and VTA2 circuits
  5. ECM
P2135
Either condition is met (1 trip detection logic):
(a) Difference between the output voltages of VTA1 and VTA2 is 0.02 V or less for 0.5 seconds or more.
(b) Output voltage of VTA1 is 0.2 V or less, and VTA2 is 1.75 V or less for 0.4 seconds or more.
  1. Short between VTA1 and VTA2 circuits
  2. Throttle position sensor (built into throttle body assembly)
  3. ECM

HINT:
  1. When any of these DTCs are set, 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.
  1. Throttle Position No. 1 denotes the VTA1 signal, and Throttle Position No. 2 denotes the VTA2 signal.

    Reference (Normal Condition):

    Tester 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 5.0 V


CONFIRMATION DRIVING PATTERN


A198824E01

  1. Connect the intelligent tester to the DLC3.
  2. Turn the ignition switch to ON and turn the tester on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC operation).
  4. Turn the ignition switch off and wait for at least 30 seconds.
  5. Turn the ignition switch to ON and turn the tester 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 / DTC [D].
  10. Read pending DTCs.

    HINT:
    1. If a pending DTC is output, the system is malfunctioning.
    2. 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.

    Tester Display
    		Description
    NORMAL
    1. DTC judgment completed
    2. System normal
    ABNORMAL
    1. DTC judgment completed
    2. System abnormal
    INCOMPLETE
    1. DTC judgment not completed
    2. You should perform driving pattern after confirming DTC enabling conditions
    UNKNOWN
    1. Unable to perform DTC judgment
    2. Number of DTCs which do not fulfill DTC preconditions has reached ECU's memory limit

    HINT:
    1. If the judgment result shows NORMAL, the system is normal.
    2. If the judgment result shows ABNORMAL, the system has a malfunction.
    3. If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [B] through [D] again.


FAIL-SAFE

When any of these DTCs or other DTCs relating to ETCS (Electronic Throttle Control System) malfunctions are set, the ECM enters fail-safe mode. During fail-safe mode, the ECM cuts off the current to the throttle actuator and the throttle valve is returned to a 6.5° 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 opening angle, to allow the vehicle to continue at a minimal speed. If the accelerator pedal is depressed gently, the vehicle can be driven slowly. Fail-safe mode continues until a pass condition is detected, and the ignition switch is then turned off.

WIRING DIAGRAM


A148768E20


INSPECTION PROCEDURE

HINT:
Read freeze frame data using an intelligent tester. 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.

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

  1. Connect an intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

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

  1. Read the values.

    Result 
    When Accelerator Pedal Released
    		When Accelerator Pedal 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 V to 0.2 V
    		0 V to 0.2 V
    		0 V to 0.2 V
    		0 V to 0.2 V
    		VC circuit open
    		A
    4.5 V to 5.0 V
    		4.5 V to 5.0 V
    		4.5 V to 5.0 V
    		4.5 V to 5.0 V
    		E2 circuit open
    0 V to 0.2 V,
    or 4.5 V to 5.0 V
    		2.1 V to 3.1 V
    (Fail-safe)
    		0 V to 0.2 V,
    or 4.5 V to 5.0 V
    		2.1 V to 3.1 V
    (Fail-safe)
    		VTA1 circuit open or ground short
    0.6 V to 1.4 V
    (Fail-safe)
    		0 V to 0.2 V,
    or 4.5 V to 5.0 V
    		0.6 V to 1.4 V
    (Fail-safe)
    		0 V to 0.2 V,
    or 4.5 V to 5.0 V
    		VTA2 circuit open or ground short
    0.5 V to 1.1 V
    		2.1 V to 3.1 V
    		3.2 V to 4.8 V
    (Not fail-safe)
    		4.6 V to 5.0 V
    (Not fail-safe)
    		Throttle position sensor circuit normal
    		B

    HINT:
    1. DTC P0121 is stored when the voltages output from VTA1 and VTA2 are not consistent with the characteristics of the sensors. Therefore, check the Freeze Frame Data when this DTC is output. Use the following formula to confirm relative fluctuations in voltage.

      Features of sensor output:
      VTA2 x 0.8 is approximately equal to VTA1 + 1.11 V
      VTA1: Throttle Position No. 1
      VTA2: Throttle Position No. 2

    2. If DTC P0121 is output, proceed to "Check Harness and Connector (Throttle Position Sensor - ECM)".



B
Go to step 5
A


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


    A200901E01

  1. Disconnect the throttle body assembly connector.

  1. Disconnect the ECM connector.

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

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    B36-5 (VC) - B8-89 (VCTA)
    		Always
    		Below 1 Ω
    B36-6 (VTA) - B8-113 (VTA1)
    		Always
    		Below 1 Ω
    B36-4 (VTA2) - B8-112 (VTA2)
    		Always
    		Below 1 Ω
    B36-3 (E2) - B8-90 (ETA)
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    B36-5 (VC) or B8-89 (VCTA) - Body ground
    		Always
    		10 kΩ or higher
    B36-6 (VTA) or B8-113 (VTA1) - Body ground
    		Always
    		10 kΩ or higher
    B36-4 (VTA2) or B8-112 (VTA2) - Body ground
    		Always
    		10 kΩ or higher

    Text in Illustration 
    *1
    		Front view of wire harness connector:
    (to Throttle Body Assembly)
    *2
    		Front view of wire harness connector:
    (to ECM)

  1. Reconnect the throttle body assembly connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.INSPECT ECM (VC VOLTAGE)


    A200902E01

  1. Disconnect the throttle body assembly connector.

  1. Turn the ignition switch to ON.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    C17-5 (VC) - C17-3 (E2)
    		Ignition switch ON
    		4.5 to 5.5 V

    Text in Illustration 
    *1
    		Front view of wire harness connector:
    (to Throttle Body Assembly)

  1. Reconnect the throttle body assembly connector.



NG
REPLACE ECM (Click here)
OK


4.REPLACE THROTTLE BODY ASSEMBLY

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


NEXT


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

  1. Connect an intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

  1. Enter the following menus: Powertrain / Engine and ECT / DTC / Clear.

  1. Clear DTCs.

  1. Start the engine.

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

  1. Read DTCs.
    Result 
    Result
    		Proceed to
    P0120, P0122, P0123, P0220, P0222, P0223 and/or P2135
    		A
    No output
    		B



B
END
A

REPLACE ECM (Click here)