Dtc P0120 Throttle / Pedal Position Sensor / Switch A Circuit Malfunction

Engine. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
2Az-Fe Engine Control System. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35

DESCRIPTION

FAIL-SAFE

WIRING DIAGRAM

INSPECTION PROCEDURE

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

CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)

INSPECT ECM (VC VOLTAGE)

REPLACE THROTTLE BODY ASSEMBLY

CHECK WHETHER DTC OUTPUT RECURS (THROTTLE POSITION SENSOR DTCS)

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

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

DESCRIPTION

The Throttle Position (TP) sensor is mounted on the throttle body assembly, and detects the opening angle of the throttle valve. This sensor is a non-contact type. It uses Hall-effect elements in order to yield accurate signals even in extreme driving conditions such as at high speeds and very low speeds.
The TP sensor has two sensor circuits which each transmit 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.

Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.2Az-Fe Engine Control System.Sfi System. Dtc P0120 Throttle / Pedal Position Sensor / Switch A Circuit Malfunction


DTC No.
DTC Detection Condition
Trouble Area
P0120
Output voltage of VTA1 quickly fluctuates beyond lower and upper malfunction thresholds for 2 seconds when accelerator pedal depressed
(1 trip detection logic)
  1. Throttle Position (TP) sensor (built into throttle body assembly)
  1. ECM
P0122
Output voltage of VTA1 0.2 V or less for 2 seconds when accelerator pedal depressed
(1 trip detection logic)
  1. TP sensor (built into throttle body assembly)
  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 when accelerator pedal depressed
(1 trip detection logic)
  1. TP sensor (built into throttle body assembly)
  1. Open in VTA1 circuit
  1. Open in E2 circuit
  1. Short between VC and VTA1 circuit
  1. ECM
P0220
Output voltage of VTA2 quickly fluctuates beyond lower and upper malfunction thresholds for 2 seconds when accelerator pedal depressed
(1 trip detection logic)
  1. TP sensor (built into throttle body assembly)
  1. ECM
P0222
Output voltage of VTA2 1.75 V or less for 2 seconds when accelerator pedal depressed
(1 trip detection logic)
  1. TP sensor (built into throttle body assembly)
  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 when accelerator pedal depressed
(1 trip detection logic)
  1. TP sensor (built into throttle body assembly)
  1. Open in VTA2 circuit
  1. Open in E2 circuit
  1. Short between VC and VTA2 circuit
  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 circuit
  1. TP sensor (built into throttle body assembly)
  1. ECM
HINT:
  1. When any of these DTCs are set, check the throttle valve opening angle by selecting the following menu items on the intelligent tester: Powertrain / Engine and ECT / Data List / Throttle Position and Throttle Position No.2.
  1. Throttle Position 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
    		0.5 to 1.1 V
    		3.3 to 4.9 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 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 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. Fail-safe mode continues until a pass condition is detected, and the ignition switch is then turned off.

WIRING DIAGRAM


Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.2Az-Fe Engine Control System.Sfi System. Dtc P0120 Throttle / Pedal Position Sensor / Switch A Circuit Malfunction


INSPECTION PROCEDURE

HINT:
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 USING INTELLIGENT TESTER (THROTTLE POSITION AND THROTTLE POSITION NO.2)

  1. Connect the intelligent tester to the DLC3.

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

  1. Select the following menu items: Powertrain / Engine and ECT / Data List / Throttle Position and Throttle Position No.2.

  1. Read the values displayed on the tester.

    Result:

    TP (VTA1)
    When Accelerator pedal Released
    		TP No.2 (VTA2)
    When Accelerator pedal Released
    		TP (VTA1)
    When Accelerator pedal Depressed
    		TP No.2 (VTA2)
    When Accelerator pedal Depressed
    		Trouble Area
    		Proceed to
    0 V to 0.2 V
    		0 V to 0.2 V
    		0 V to 0.2 V
    		0 V to 0.2 V
    		VC circuit open
    		A
    4.5 V to 5.0 V
    		4.5 V to 5.0 V
    		4.5 V to 5.0 V
    		4.5 V to 5.0 V
    		E2 circuit open
    0 V to 0.2 V,
    or 4.5 V to 5.0 V
    		2.4 V to 3.4 V
    (Fail-safe)
    		0 V to 0.2 V,
    or 4.5 V to 5.0 V
    		2.4 V to 3.4 V
    (Fail-safe)
    		VTA1 circuit open or ground short
    0.7 V to 1.3 V
    (Fail-safe)
    		0 V to 0.2 V,
    or 4.5 V to 5.0 V
    		0.7 V to 1.3 V
    (Fail-safe)
    		0 V to 0.2 V,
    or 4.5 V to 5.0 V
    		VTA2 circuit open or ground short
    0.5 V to 1.1 V
    		2.1 V to 3.1 V
    		3.3 V to 4.9 V
    (Not fail-safe)
    		4.6 V to 5.0 V
    (Not fail-safe)
    		TP sensor circuit normal
    		B
HINT:
TP denotes Throttle Position , and TP No.2 denotes Throttle Position No.2.


B
Go to step 5
A


2.CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.2Az-Fe Engine Control System.Sfi System. Dtc P0120 Throttle / Pedal Position Sensor / Switch A Circuit Malfunction

  1. Disconnect the B3 throttle body connector.

  1. Disconnect the B32 ECM connector.

  1. Measure the resistance.

    Standard resistance (Check for open):
    Tester Connection
    		Specified Condition
    VC (B3-5) - VCTA (B32-67)
    		Below 1 Ω
    VTA (B3-6) - VTA1 (B32-115)
    VTA2 (B3-4) - VTA2 (B32-114)
    E2 (B3-3) - ETA (B32-91)
    Standard resistance (Check for short):
    Tester Connection
    		Specified Condition
    VC (B3-5) or VCTA (B32-67) - Body ground
    		10 kΩ or higher
    VTA (B3-6) or VTA1 (B32-115) - Body ground
    VTA2 (B3-4) or VTA2 (B32-114) - Body ground

  1. Reconnect the throttle body connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.INSPECT ECM (VC VOLTAGE)
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.2Az-Fe Engine Control System.Sfi System. Dtc P0120 Throttle / Pedal Position Sensor / Switch A Circuit Malfunction

  1. Disconnect the B3 throttle body connector.

  1. Turn the ignition switch on (IG).

  1. Measure the voltage between the terminals of the throttle body connector.

    Standard voltage:
    Tester Connection
    		Specified Condition
    VC (B3-5) - E2 (B3-3)
    		4.5 to 5.5 V

  1. Reconnect the throttle body connector.



NG
REPLACE ECM
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 (IG) and turn the tester ON.

  1. Clear DTCs (RAV4_ACA30 RM000000PDK0AJX.html).

  1. Start the engine.

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

  1. Select the following menu items: Powertrain / Engine and ECT / DTC.

  1. Read DTCs.

    Result:
    Display (DTC Output)
    		Proceed to
    P0120, P0122, P0123, P0220, P0222, P0223 and/or P2135
    		A
    No output
    		B


B
SYSTEM OK
A

REPLACE ECM