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

for Preparation Click here


DESCRIPTION

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

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 sensor. It 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 2 sensor circuits, 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 VTA1 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.

A208679E04


DTC No.
DTC Detection Condition
Trouble Area
P0120
Output voltage of VTA1 quickly fluctuates beyond lower and upper malfunction thresholds for 2 seconds or more when accelerator pedal depressed
(1 trip detection logic)
  1. Throttle position sensor (built into throttle body assembly )
  2. ECM
P0121
Difference between VTA1 and VTA2 voltages less than 0.8 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 or more 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 4.535 V or more for 2 seconds or more when accelerator pedal 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
The output voltage of VTA2 quickly fluctuates beyond the lower and upper malfunction thresholds for 2 seconds or more
(1 trip detection logic)
  1. Throttle position sensor (built into throttle body assembly)
  2. ECM
P0222
The output voltage of VTA2 is 1.75 V or less for 2 seconds or more
(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
The output voltage of VTA2 is 4.8 V or higher and VTA1 is between 0.2 V and 2.02 V for 2 seconds or more
(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 of the following conditions is met (1 trip detection logic):
(a) The difference between the output voltages of VTA1 and VTA2 is 0.02 V or less for 0.5 seconds or more
(b) The 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.
  2. 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


FAIL-SAFE

When any of these DTCs as well as other DTCs relating to ETCS (Electronic Throttle Control System) malfunctions are stored, the ECM enters fail-safe mode. During fail-safe mode, the ECM cuts the current to the throttle actuator, and the throttle valve is returned to a 5.5° 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 firmly and 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 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 SENSOR)

  1. Connect the 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 displayed on the tester.


Result 
When Accelerator Pedal Released
When Accelerator Pedal Depressed
Trouble Area
Proceed to
Throttle Position No. 1
Throttle Position No. 2
Throttle Position No. 1
Throttle Position No. 2
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
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
0.6 to 1.4 V
(Fail-safe)
0 to 0.2 V, or 4.5 to 5.0 V
0.6 to 1.4 V
(Fail-safe)
0 to 0.2 V, or 4.5 to 5.0 V
VTA2 circuit open or ground short
0.5 to 1.1 V
2.1 to 3.1 V
3.2 to 4.8 V
(Not fail-safe)
4.6 to 5.0 V
(Not fail-safe)
TP sensor circuit normal
B

HINT:
  1. DTC P0121 is stored when the voltage 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 the "CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)".



B
Go to step 5
A


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

  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

  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
    B36-5 (VC) - B36-3 (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 the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. 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. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

  1. Read the DTCs.
    Result 
    Result
    		Proceed to
    DTC P0120, P0122, P0123, P0220, P0222, P0223 and/or P2135 is output
    		A
    DTC is not output
    		B



B
END
A

REPLACE ECM (Click here)