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

для подготовки Нажмите здесь


DESCRIPTION

УКАЗАНИЕ:
This ETCS (Electronic 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 circuit, each of which 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.


A157714E01


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. 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)
  2. Short in VTA1 circuit
  3. Open in VC circuit
  4. 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)
  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 lower and upper malfunction thresholds for 2 seconds
(1 trip detection logic)
  1. TP sensor (built into throttle body)
  2. 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)
  2. Short in VTA2 circuit
  3. Open in VC circuit
  4. 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)
  2. Open in VTA2 circuit
  3. Open in E2 circuit
  4. Short between VC and VTA2 circuits
  5. 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 circuits
  2. TP sensor (built into throttle body)
  3. ECM

УКАЗАНИЕ:
  1. When any of these DTCs are set, check the throttle valve opening angle by entering the following menus on the intelligent tester: Powertrain / Engine / Data List / Throttle Position and Throttle Position No. 2.
  2. Throttle 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 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.
  2. 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.
  3. 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 fail-safe mode, the ECM cuts the current to the throttle actuator off, 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 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


A147857E01


INSPECTION PROCEDURE

УКАЗАНИЕ:
  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. Freeze frame data records the engine condition 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.READ VALUE OF INTELLIGENT TESTER (THROTTLE POS AND THROTTLE POS #2)

ПРЕДОСТЕРЕЖЕНИЕ:
Set the parking brake to fix the wheels in place.

  1. Connect the intelligent tester to the DLC3.

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

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

  1. While the accelerator pedal is fully closed, read the values of THROTTLE POS #1 and THROTTLE POS #2.

  1. Start the engine.

  1. Firmly depress the brake pedal with your left foot, and move the shift lever to D.

  1. Read the value displayed on the tester.


Result:

Throttle Position No. 1
When Accelerator Pedal Released
Throttle Position No. 2
When Accelerator Pedal Released
Throttle Position No. 1
When Accelerator Pedal Depressed
Throttle Position No. 2
When Accelerator Pedal Depressed
Trouble Area
Proceed to
0 to 0.2 V
0 to 0.2 V
0 to 0.2 V
0 to 0.2 V
VC circuit open
A
4.5 to 5.0 V
4.5 to 5.0 V
4.5 to 5.0 V
4.5 to 5.0 V
E2 circuit open
A
0 to 0.2 V, or 4.5 to 5.0 V
2.1 to 3.1 V
(Fail-safe)
0 to 0.2 V, or 4.5 to 5.0 V
2.1 to 3.1 V
(Fail-safe)
VTA1 circuit open or ground short
A
0.5 to 1.1 V
(Fail-safe)
0 to 0.2 V, or 4.5 to 5.0 V
0.5 to 1.1 V
(Fail-safe)
0 to 0.2 V, or 4.5 to 5.0 V
VTA2 circuit open or ground short
A
0.5 to 1.1 V
2.1 to 3.1 V
3.2 to 4.8 V
(Not fail-safe)
4.5 to 5.0 V
(Not fail-safe)
TP sensor circuit normal
B

УКАЗАНИЕ:
TP stands for throttle position.



B
Перейдите к шагу 5
A


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


    A149671E03

  1. Disconnect the E21 throttle body connector.

  1. Disconnect the E2 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
    E21-5 (VC) - E2-34 (VCTA)
    		Always
    		Below 1 Ω
    E21-6 (VTA) - E2-26 (VTA1)
    		Always
    		Below 1 Ω
    E21-4 (VTA2) - E2-27 (VTA2)
    		Always
    		Below 1 Ω
    E21-3 (E2) - E2-35 (ETA)
    		Always
    		Below 1 Ω

    Standard resistance (Check for short):
    Tester Connection
    		Condition
    		Specified Condition
    E21-5 (VC) or E2-34 (VCTA)- Body ground
    		Always
    		10 kΩ or higher
    E21-6 (VTA) or E2-26 (VTA1) - Body ground
    		Always
    		10 kΩ or higher
    E21-4 (VTA2) or E2-27 (VTA2) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.INSPECT ECM (VCTA VOLTAGE)


    A148848E05

  1. Disconnect the E21 throttle body connector.

  1. Turn the engine switch on (IG).

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

    Standard voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    E2-34 (VCTA) - E2-35 (ETA)
    		Engine switch on (IG)
    		4.5 to 5.0 V



NG
REPLACE ECM (Нажмите здесь)
OK


4.REPLACE THROTTLE BODY

  1. Replace the throttle body (see page Нажмите здесь).


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 (see page Нажмите здесь).

  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 ECM (Нажмите здесь)