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


DESCRIPTION

HINT:
This ETC (Electrical Throttle Control System) does not use a throttle cable.
The Throttle Position (TP) sensor is mounted on the throttle body, and detects the opening angle of the throttle valve. This sensor is a non-contact type, and 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 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 (Included in HV Control ECU).
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.


A019802E07


DTC No.
DTC Detection Condition
Trouble Area
P0120
Output voltage of VTA1 quickly fluctuates beyond lower and upper malfunction thresholds for 2 seconds
(1 trip detection logic)
  1. Throttle Position (TP) sensor (built into throttle body)
  2. HV Control ECU
P0122
Output voltage of VTA1 0.2 V or less for 2 seconds
(1 trip detection logic)
  1. TP sensor (built into throttle body)
  2. Short in VTA1 circuit
  3. Open in VC circuit
  4. HV Control ECU
P0123
Output voltage of VTA1 4.535 V or more for 2 seconds
(1 trip detection logic)
  1. TP sensor (built into throttle body)
  2. Open in VTA1 circuit
  3. Open in E2 circuit
  4. Short between VC and VTA1 circuits
  5. HV Control ECU
P0220
Output voltage of VTA2 quickly fluctuates beyond lower and upper malfunction thresholds for 2 seconds
(1 trip detection logic)
  1. TP sensor (built into throttle body)
  2. HV Control ECU
P0222
Output voltage of VTA2 1.75 V or less for 2 seconds
(1 trip detection logic)
  1. TP sensor (built into throttle body)
  2. Short in VTA2 circuit
  3. Open in VC circuit
  4. HV Control ECU
P0223
Output voltage of VTA2 4.535 V or more, and VTA1 between 0.2 V and 2.02 V, for 2 seconds (1 trip detection logic)
  1. TP sensor (built into throttle body)
  2. Open in VTA2 circuit
  3. Open in E2 circuit
  4. Short between VC and VTA2 circuits
  5. HV Control ECU
P2135
Either condition (a) or (b) 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 circuits
  2. TP sensor (built into throttle body)
  3. HV Control ECU

HINT:
  1. When any of these DTCs are set, check the throttle valve opening angle by entering the following menus on an intelligent tester: Powertrain / Engine / Data List / Throttle POS AND Throttle POS #2.
  2. Throttle POS denotes the VTA1 signal (expressed in percentages), and Throttle POS #2 denotes the VTA2 signal (expressed in voltages).


Reference (Normal Condition):

Tester Display
Accelerator Pedal Fully Released
Accelerator Pedal Fully Depressed
THROTTLE POS
10 to 24 %
64 to 96 %
THROTTLE POS #2
2.1 to 3.1 V
4.5 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 (Included in HV Control ECU) enters fail-safe mode. During 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 firmly and gently, the vehicle can be driven slowly.

WIRING DIAGRAM


A085458E11


INSPECTION PROCEDURE

HINT:
  1. If other DTCs relating to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.
  2. 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.
  3. These DTCs relate to the Throttle Position (TP) sensor.

1.READ VALUE USING INTELLIGENT TESTER (THROTTLE POS AND THROTTLE POS #2)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch ON and turn the intelligent tester ON.

  1. Enter the following menus: Powertrain / Engine / Data List / Throttle POS and Throttle POS #2.

  1. Check the values displayed on the tester.

    Result:

    TP#1 (VTA1)
    When AP Released
    		TP#2 (VTA2)
    When AP Released
    		TP#1 (VTA1)
    When AP Depressed
    		TP#2 (VTA2)
    When AP Depressed
    		Trouble Area
    		Proceed to
    0 %
    		Between
    0 V and 0.2 V
    		0 %
    		Between
    0 V and 0.2 V
    		VC circuit open
    		A
    100 %
    		Between
    4.5 V and 5.0 V
    		100 %
    		Between
    4.5 V and 5.0 V
    		E2 circuit open
    		A
    0 % or 100 %
    		Between
    2.1 V and 3.1 V
    (Fail-safe)
    		0 % or 100 %
    		Between
    2.1 V and 3.1 V
    (Fail-safe)
    		VTA1 circuit open or ground short
    		A
    Approx 19 %
    (Fail-safe)
    		Between
    0 V and 0.2 V,
    or 4.5 V and 5.0 V
    		Between
    10 % and 24 %
    (Fail-safe)
    		Between
    0 V and 0.2 V,
    or 4.5 V and 5.0 V
    		VTA2 circuit open or ground short
    		A
    Between
    10 % and 24 %
    		Between
    2.1 V and 3.1 V
    		Between
    64 % and 96 %
    (Not fail-safe)
    		Between
    4.5 V and 5.0 V
    (Not fail-safe)
    		TP sensor circuit normal
    		B

    HINT:
    1. TP#1 denotes THROTTLE POS, and TP#2 denotes THROTTLE POS#2.
    2. AP denotes Accelerator Pedal.
    3. VTA1 is expressed as percentages, and VTA2 is expressed as voltages.



B
Go to step 5
A


2.CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - HV CONTROL ECU)


    A110904E03

  1. Disconnect the T2 throttle body connector.

  1. Disconnect the H34 HV Control ECU connector.

  1. Measure the resistance between the terminals of the throttle body and HV Control ECU.

    Standard resistance (Check for open):
    Tester Connection
    		Specified Condition
    VC (T2-5) - VC (H34-18)
    		Below 1 Ω
    VTA (T2-6) - VTA (H34-21)
    		Below 1 Ω
    VTA2 (T2-4) - VTA2 (H34-31)
    		Below 1 Ω
    E2 (T2-3) - E2 (H34-28)
    		Below 1 Ω

    Standard resistance (Check for short):
    Tester Connection
    		Specified Condition
    VC (T2-5) or VC (H34-18) - Body ground
    		10 kΩ or higher
    VTA (T2-6) or VTA (H34-21) - Body ground
    		10 kΩ or higher
    VTA2 (T2-4) or VTA2 (H34-31) - Body ground
    		10 kΩ or higher

  1. Reconnect the throttle body connector.

  1. Reconnect the HV Control ECU connector.



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


3.INSPECT HV CONTROL ECU (VC VOLTAGE)


    A107694E05

  1. Disconnect the T2 throttle body connector.

  1. Turn the ignition switch ON.

  1. Measure the voltage between the terminals VC and E2 of the H34 HV Control ECU connector.

    Standard voltage:
    Tester Connection
    		Specified Condition
    VC (H34-18) - E2 (H34-28)
    		4.5 to 5.0 V

  1. Reconnect the throttle body connector.



NG
REPLACE HV CONTROL ECU
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 ON and turn the tester ON.

  1. Clear DTCs (Click here).

  1. Put the engine in inspection mode (Click here).

  1. Start the engine.

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

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

  1. Read DTCs.

    Result:

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



B
SYSTEM OK
A

REPLACE HV CONTROL ECU