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

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

for Preparation Click here

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

DESCRIPTION

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 transmit 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.

A019802E51


DTC No.
DTC Detection Condition
Trouble Area
P0120
Output voltage of VTA1 quickly fluctuates beyond lower and upper malfunction thresholds for 2 seconds when accelerator pedal depressed
(1 trip detection logic)
  1. Throttle Position (TP) sensor (built into throttle body assembly)
  1. ECM
P0122
Output voltage of VTA1 0.2 V or less for 2 seconds when accelerator pedal depressed
(1 trip detection logic)
  1. TP sensor (built into throttle body assembly)
  1. Short in VTA1 circuit
  1. Open in VC circuit
  1. ECM
P0123
Output voltage of VTA1 4.535 V or more for 2 seconds when accelerator pedal depressed
(1 trip detection logic)
  1. TP sensor (built into throttle body assembly)
  1. Open in VTA1 circuit
  1. Open in E2 circuit
  1. Short between VC and VTA1 circuit
  1. ECM
P0220
Output voltage of VTA2 quickly fluctuates beyond lower and upper malfunction thresholds for 2 seconds when accelerator pedal depressed
(1 trip detection logic)
  1. TP sensor (built into throttle body assembly)
  1. ECM
P0222
Output voltage of VTA2 1.75 V or less for 2 seconds when accelerator pedal depressed
(1 trip detection logic)
  1. TP sensor (built into throttle body assembly)
  1. Short in VTA2 circuit
  1. Open in VC circuit
  1. ECM
P0223
Output voltage of VTA2 4.8 V or more, and VTA1 between 0.2 V and 2.02 V, for 2 seconds when accelerator pedal depressed
(1 trip detection logic)
  1. TP sensor (built into throttle body assembly)
  1. Open in VTA2 circuit
  1. Open in E2 circuit
  1. Short between VC and VTA2 circuit
  1. ECM
P2135
Either condition (a) or (b) is met (1 trip detection logic):
(a) Difference between output voltages of VTA1 and VTA2 0.02 V or less for 0.5 seconds or more
(b) Output voltage of VTA1 0.2 V or less, and VTA2 1.75 V or less, for 0.4 seconds or more
  1. Short between VTA1 and VTA2 circuit
  1. TP sensor (built into throttle body assembly)
  1. ECM

HINT:
  1. When any of these DTCs are set, check the throttle valve opening angle by selecting the following menu items on the intelligent tester: Powertrain / Engine and ECT / Data List / Throttle Position and Throttle Position No. 2.
  1. Throttle Position 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
    0.5 to 1.1 V
    3.3 to 4.9 V
    Throttle Position No. 2
    2.1 to 3.1 V
    4.6 to 5.0 V

FAIL-SAFE

When any of these DTCs, as well as 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 the current to the throttle actuator off, and the throttle valve is returned to a 6° 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


A088199E06


INSPECTION PROCEDURE

HINT:
Read freeze frame data using the 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 AND THROTTLE POSITION NO. 2)
  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to the ON position and turn the tester on.

  1. Select the following menu items: Powertrain / Engine and ECT / Data List / Throttle Position and Throttle Position No. 2.

  1. Read the values displayed on the tester.

    Result:

    TP (VTA1)
    When Accelerator pedal Released
    TP No. 2 (VTA2)
    When Accelerator pedal Released
    TP (VTA1)
    When Accelerator pedal Depressed
    TP No. 2 (VTA2)
    When Accelerator pedal Depressed
    Trouble Area
    Proceed to
    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
    2.4 V to 3.4 V
    (Fail-safe)
    0 V to 0.2 V,
    or 4.5 V to 5.0 V
    2.4 V to 3.4 V
    (Fail-safe)
    VTA1 circuit open or ground short
    0.7 V to 1.3 V
    (Fail-safe)
    0 V to 0.2 V,
    or 4.5 V to 5.0 V
    0.7 V to 1.3 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
    3.3 V to 4.9 V
    (Not fail-safe)
    4.6 V to 5.0 V
    (Not fail-safe)
    TP sensor circuit normal
    B

HINT:
TP denotes Throttle Position, and TP No. 2 denotes Throttle Position No. 2.


B
Go to step 5
A


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


    A107944E07
  1. Disconnect the C5 throttle body connector.

  1. Disconnect the C24 ECM connector.

  1. Measure the resistance between the terminals of the wire harness side connectors.

    Standard resistance (Check for open):
    Tester Connection
    Specified Condition
    VC (C5-5) - VCTA (C24-67)
    Below 1 Ω
    VTA (C5-6) - VTA1 (C24-115)
    VTA2 (C5-4) - VTA2 (C24-114)
    E2 (C5-3) - ETA (C24-91)

    Standard resistance (Check for short):
    Tester Connection
    Specified Condition
    VC (C5-5) or VCTA (C24-67) - Body ground
    10 kΩ or higher
    VTA (C5-6) or VTA1 (C24-115) - Body ground
    VTA2 (C5-4) or VTA2 (C24-114) - Body ground
  1. Reconnect the throttle body connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.INSPECT ECM (VC VOLTAGE)


    A107895E06
  1. Disconnect the C5 throttle body connector.

  1. Turn the ignition switch to the ON position.

  1. Measure the voltage between the terminals of the throttle body connector.

    Standard voltage:
    Tester Connection
    Specified Condition
    VC (C5-5) - E2 (C5-3)
    4.5 to 5.5 V
  1. Reconnect the throttle body connector.



NG
REPLACE ECM
OK


4.REPLACE THROTTLE BODY ASSEMBLY

NEXT


5.CHECK WHETHER DTC OUTPUT RECURS (THROTTLE POSITION SENSOR DTCS)
  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to the ON position and turn the tester on.

  1. Clear the DTCs (Click here).

  1. Start the engine.

  1. Allow the engine to idle for 15 seconds or more.

  1. Select the following menu items: Powertrain / Engine and ECT / DTC.

  1. Read the DTCs.

    Result:
    Display (DTC Output)
    Proceed to
    P0120, P0122, P0123, P0220, P0222, P0223 and/or P2135
    A
    No output
    B


B
SYSTEM OK
A

REPLACE ECM