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

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:
  1. This Electronic Throttle Control System (ETCS) does not use a throttle cable.
  2. This throttle position sensor is a non-contact type.

The throttle position sensor is mounted on the throttle body and it detects the opening angle of the throttle valve. This sensor is electronically controlled and uses Hall-effect elements so that accurate control and reliability can be obtained. The throttle position sensor has 2 sensor elements, VTA and VTA2, each with their own signal outputs. VTA is used to detect the throttle opening angle and VTA2 is used to detect malfunctions in VTA. Voltage applied to VTA and VTA2 changes between 0 V to 5 V in proportion to the opening angle of the throttle valve. There are several checks that the ECM performs to confirm proper operation of the throttle position sensor.
The ECM judges the current opening angle of the throttle valve from these signals input from terminals VTA and VTA2, and the ECM controls the throttle actuator to set the throttle valve angle properly in response to driver inputs.

A019802E14


DTC No.
DTC Detection Condition
Trouble Area
P0120
VTA is 0.2 V or less or VTA is 4.8 V or more (for 2 seconds)
(1 trip detection logic)
  1. Throttle position sensor (built into throttle body)
  2. ECM
P0122
VTA is 0.2 V or less (for 2 seconds)
(1 trip detection logic)
  1. Throttle position sensor (built into throttle body)
  2. Short in VTA circuit
  3. Open in VC circuit
  4. ECM
P0123
VTA is 4.8 V or more (for 2 seconds)
(1 trip detection logic)
  1. Throttle position sensor (built into throttle body)
  2. Open in VTA circuit
  3. Open in E2 circuit
  4. VC and VTA circuit are shorted
  5. ECM
P0220
VTA2 is 0.5 V or less, or VTA2 is 4.8 V or more
VTA is 0.2 V or more, and VTA is 1.8 V or less
(1 trip detection logic)
  1. Throttle position sensor (built into throttle body)
  2. ECM
P0222
VTA2 is 0.5 V or less (for 2 seconds)
(1 trip detection logic)
  1. Throttle position sensor (built into throttle body)
  2. Short in VTA2 circuit
  3. Open in VC circuit
  4. ECM
P0223
VTA2 is 4.8 V or more when VTA is between 0.2 to 1.8 V (for 2 seconds)
(1 trip detection logic)
  1. Throttle position sensor (built into throttle body)
  2. Open in VTA2 circuit
  3. Open in E2 circuit
    VC and VTA2 circuit are shorted
  4. ECM
P2135
  1. Condition (a) continues for 0.5 seconds or more, or condition (b) continues for 0.4 seconds or more:
    1. (a) Difference between VTA and VTA2 is 0.02 V or less
    2. (b) VTA is 0.2 V or less, and VTA2 is 0.5 V or less (1 trip detection logic)
  1. VTA and VTA2 circuit are shorted
  2. Throttle position sensor (built into throttle body)
  3. ECM

HINT:
  1. After confirming DTCs, use the intelligent tester to confirm the throttle valve opening percentage and throttle position sensor condition.
  2. Throttle Position is the VTA signal. Throttle Position No. 2 is the VTA2 signal.


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

  1. The ECM uses the throttle position sensor to monitor the throttle valve opening angle.
    1. There is a specific voltage difference expected between VTA and VTA2 for each throttle opening angle.
      If the difference between VTA and VTA2 is incorrect, the ECM interprets this as a fault and will set a DTC.
    2. VTA and VTA2 each have a specific voltage operating range.
      If VTA or VTA2 is out of the normal operating range, the ECM interprets this as a fault and will set a DTC.
    3. VTA and VTA2 should never be close to the same voltage levels.
      If VTA is within 0.02 V of VTA2, the ECM interprets this as a short circuit in the throttle position sensor system and will set a DTC.
      This monitor runs for 2 seconds (the first 2 seconds of engine idle) after the engine is started (1 trip detection logic).

FAIL-SAFE

If the ETCS has a malfunction, the ECM cuts off current to the throttle actuator. The throttle valve returns to a predetermined opening angle (approximately 16°) by the force of 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 enable the vehicle to continue at a minimal speed.
If the accelerator pedal is depressed firmly and slowly, the vehicle can be driven slowly.
If a "pass" condition is detected and then the engine switch is turned off, the fail-safe operation will stop and the system will return to normal.

WIRING DIAGRAM


A085458E05


INSPECTION PROCEDURE

HINT:
  1. If DTCs related 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 conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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. This is the repair procedure of the throttle position sensor.

1.READ DATA LIST (THROTTLE POSITION SENSOR VALUE)
FI07052E07

  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 / Primary / Throttle Position and Throttle Position No. 2.

  1. Read the value.


Result:

Throttle position expressed as percentage and voltage
Trouble Area
Proceed to
Accelerator pedal released
Accelerator pedal depressed
Throttle Position
(VTA)
Throttle Position No. 2
(VTA2)
Throttle Position
(VTA)
Throttle Position No. 2
(VTA2)
0%
0 to 0.2 V
0%
0 to 0.2 V
VC circuit open
A
100%
4.5 to 5.0 V
100%
4.5 to 5.0 V
E2 circuit open
A
0% or 100%
2.1 to 3.1 V
(fail-safe)
0% or 100%
2.1 to 3.1 V
(fail-safe)
VTA circuit open or ground short
A
Approx. 16%
(fail-safe)
0 to 0.2 or 4.5 to 5.0 V
Approx. 16%
(fail-safe)
0 to 0.2 or 4.5 to 5.0 V
VTA2 circuit open or ground short
A
10 to 24%
2.1 to 3.1 V
64 to 96%
(no fail-safe)
4.5 to 5.0 V
(no fail-safe)
Throttle positon sensor circuit is normal
B



B
Go to step 5
A


2.CHECK WIRE HARNESS (THROTTLE POSITION SENSOR - ECM)
A103737E06

  1. Disconnect the E39 throttle actuator connector.

  1. Disconnect the E8 ECM connector.

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    E39-5 (VC) - E8-29 (VC)
    		Below 1 Ω
    E39-6 (VTA) - E8-23 (VTA)
    		Below 1 Ω
    E39-4 (VTA2) - E8-22 (VTA2)
    		Below 1 Ω
    E39-3 (E2) - E8-28 (E2)
    		Below 1 Ω
    E39-5 (VC) or E8-29 (VC) - Body ground
    		10 kΩ or higher
    E39-6 (VTA) or E8-23 (VTA) - Body ground
    		10 kΩ or higher
    E39-4 (VTA2) or E8-22 (VTA2) - Body ground
    		10 kΩ or higher
    E39-3 (E2) or E8-28 (E2) - Body ground
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


3.CHECK ECM (VC VOLTAGE)
A053763E31

  1. Turn the engine switch on (IG).

  1. Measure the voltage of the ECM.

    Standard voltage:
    Tester Connection
    		Specified Condition
    E8-29 (VC) - E8-28 (E2)
    		4.5 to 5.5 V



NG
REPLACE ECM
OK


4.REPLACE THROTTLE BODY

NEXT


5.READ OUTPUT DTC (THROTTLE POSITION SENSOR DTCS ARE OUTPUT AGAIN)

  1. Clear the DTC.

  1. Start the engine and allow the engine to idle for 15 seconds or more.

  1. Read the DTC.

    Result:

    Display (DTC output)
    		Proceed to
    P0120, P0122, P0123, P0220, P0222, P0223 or P2135
    		A
    No output
    		B



B
SYSTEM OK
A

REPLACE ECM