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

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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.
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)
  1. ECM
P0122
Output voltage of VTA1 0.2 V or less for 2 seconds
(1 trip detection logic)
  1. TP sensor (built into throttle body)
  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
(1 trip detection logic)
  1. TP sensor (built into throttle body)
  1. Open in VTA1 circuit
  1. Open in E2 circuit
  1. Short between VC and VTA1 circuits
  1. ECM
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)
  1. ECM
P0222
Output voltage of VTA2 1.75 V or less for 2 seconds
(1 trip detection logic)
  1. TP sensor (built into throttle body)
  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 (1 trip detection logic)
  1. TP sensor (built into throttle body)
  1. Open in VTA2 circuit
  1. Open in E2 circuit
  1. Short between VC and VTA2 circuits
  1. ECM
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
  1. TP sensor (built into throttle body)
  1. ECM

HINT:
  1. When any of these DTCs are set, check the throttle valve opening angle by entering the following menus on an intelligent tester: Power train / Engine / Data List / Throttle Sensor Position and Throttle Position No. 2
  1. Throttle Sensor Position denotes the VTA1 signal (expressed in percentages), and Throttle Position No. 2 denotes the VTA2 signal (expressed in voltages).

    Reference (Normal Condition):

    Tester Display
    		Accelerator Pedal Fully Released
    		Accelerator Pedal Fully Depressed
    Throttle Sensor Position
    		10 to 24 %
    		64 to 96 %
    Throttle Position No. 2
    		2.1 to 3.1 V
    		4.5 to 5.0 V


MONITOR DESCRIPTION

The ECM uses the Throttle Position (TP) sensor to monitor the throttle valve opening angle. There are several checks that the ECM performs to confirm the proper operation of the TP sensor.
  1. A specific voltage difference is expected between the sensor terminals, VTA1 and VTA2, for each throttle valve opening angle. If the difference between VTA1 and VTA2 is incorrect, the ECM interprets this as a malfunction in the sensor, and sets a DTC.
  1. VTA1 and VTA2 each have a specific voltage range. If VTA1 or VTA2 is outside the normal operating range, the ECM interprets this as a malfunction in the sensor, and sets a DTC.
  1. VTA1 and VTA2 should never be close to the same voltage level. If VTA1 is within 0.02 V of VTA2, the ECM determines that there is a short circuit in the sensor, and sets a DTC.

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 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


A085458E04


INSPECTION PROCEDURE

HINT:
  1. If other DTCs relating to different systems that have terminal E3 as the ground terminal are output simultaneously, terminal E3 may have an open circuit.
  1. Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions 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.
  1. These DTCs relate to the Throttle Position (TP) sensor.

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

  1. Connect the intelligent tester to the DLC3.

  1. Turn the engine switch on (IG) and turn the intelligent tester ON.

  1. Enter the following menus: Power train / Engine / Data List / Throttle Sensor Position and Throttle Position No. 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 Sensor Position, and TP#2 denotes Throttle Position No. 2.
  1. AP denotes Accelerator Pedal.
  1. 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 - ECM)
A107693E01

  1. Disconnect the E39 throttle body connector.

  1. Disconnect the E6 and E8 ECM connectors.

  1. Measure the resistance.

    Standard resistance (Check for open):
    Tester Connection
    		Specified Condition
    VC (E39-5) - VC2 (E6-29)
    		Below 1 Ω
    VTA (E39-6) - VTA1 (E8-23)
    		Below 1 Ω
    VTA2 (E39-4) - VTA2 (E8-22)
    		Below 1 Ω
    E2 (E39-3) - E3 (E6-30)
    		Below 1 Ω

    Standard resistance (Check for short):
    Tester Connection
    		Specified Condition
    VC (E39-5) or VC2 (E6-29) - Body ground
    		10 kΩ or higher
    VTA (E39-6) or VTA1 (E8-23) - Body ground
    		10 kΩ or higher
    VTA2 (E39-4) or VTA2 (E8-22) - Body ground
    		10 kΩ or higher

  1. Reconnect the throttle body connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


3.INSPECT ECM (VC VOLTAGE)
A107694E01

  1. Disconnect the E39 throttle body connector.

  1. Turn the engine switch on (IG).

  1. Measure the voltage between the terminals of the E6 ECM connector.

    Standard voltage:
    Tester Connection
    		Specified Condition
    VC2 (E6-29) - E3 (E6-30)
    		4.5 to 5.0 V

  1. Reconnect the throttle body connector.



NG
REPLACE ECM
OK


4.REPLACE THROTTLE BODY

NEXT


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

  1. Connect the intelligent tester to the DLC3.

  1. Turn the engine switch on (IG) and turn the tester ON.

  1. Clear DTCs (Click here).

  1. Start the engine.

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

  1. Enter the following menus: Power train / 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 ECM