Dtc P2120 Throttle / Pedal Position Sensor / Switch D Circuit

Engine. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
3Zr-Fae Engine Control System. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35

DESCRIPTION

FAIL-SAFE

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING INTELLIGENT TESTER (ACCELERATOR PEDAL POSITION SENSOR)

CHECK HARNESS AND CONNECTOR (ACCELERATOR PEDAL POSITION SENSOR - ECM)

CHECK ECM (VCPA AND VCP2 VOLTAGE)

REPLACE ACCELERATOR PEDAL ROD

CHECK WHETHER DTC OUTPUT RECURS (ACCELERATOR PEDAL POSITION SENSOR DTCS)

DTC P2120 Throttle / Pedal Position Sensor / Switch "D" Circuit

DTC P2122 Throttle / Pedal Position Sensor / Switch "D" Circuit Low Input

DTC P2123 Throttle / Pedal Position Sensor / Switch "D" Circuit High Input

DTC P2125 Throttle / Pedal Position Sensor / Switch "E" Circuit

DTC P2127 Throttle / Pedal Position Sensor / Switch "E" Circuit Low Input

DTC P2128 Throttle / Pedal Position Sensor / Switch "E" Circuit High Input

DTC P2138 Throttle / Pedal Position Sensor / Switch "D" / "E" Voltage Correlation

HINT:
  1. These DTCs relate to the accelerator pedal position sensor.
  2. This electronic throttle control system does not use a throttle cable.

DESCRIPTION

The accelerator pedal position sensor is mounted on the accelerator pedal bracket and has 2 sensor circuits: VPA (main) and VPA2 (sub). 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 as well as very low speeds. The voltage, which is applied to terminals VPA and VPA2 of the ECM, varies between 0 V and 5 V in proportion to the operating angle of the accelerator pedal (throttle valve). A signal from VPA indicates the actual accelerator pedal position (throttle valve opening angle) and is used for engine control. A signal from VPA2 conveys the status of the VPA circuit and is used to check the accelerator pedal position sensor itself.
The ECM monitors the actual accelerator pedal position (throttle valve opening angle) through the signals from VPA and VPA2, and controls the throttle actuator according to these signals.

Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.3Zr-Fae Engine Control System.Sfi System. Dtc P2120 Throttle / Pedal Position Sensor / Switch D Circuit


DTC No.
DTC Detection Condition
Trouble Area
P2120
VPA fluctuates rapidly beyond the upper and lower malfunction thresholds for 0.5 seconds or more (1 trip detection logic).
  1. Accelerator pedal position sensor
  2. ECM
P2122
VPA is 0.4 V or less for 0.5 seconds or more when the accelerator pedal is fully released (1 trip detection logic).
  1. Accelerator pedal position sensor
  2. Open in VCPA circuit
  3. Open or ground short in VPA circuit
  4. ECM
P2123
VPA is 4.8 V or higher for 2.0 seconds or more (1 trip detection logic).
  1. Accelerator pedal position sensor
  2. Open in EPA circuit
  3. ECM
P2125
VPA2 fluctuates rapidly beyond the upper and lower malfunction thresholds for 0.5 seconds or more (1 trip detection logic).
  1. Accelerator pedal position sensor
  2. ECM
P2127
VPA2 is 1.2 V or less for 0.5 seconds or more when the accelerator pedal is fully released (1 trip detection logic).
  1. Accelerator pedal position sensor
  2. Open in VCP2 circuit
  3. Open or ground short in VPA2 circuit
  4. ECM
P2128
Conditions (a) and (b) continue for 2.0 seconds or more (1 trip detection logic):
(a) VPA2 is 4.8 V or higher.
(b) VPA is between 0.4 V and 3.45 V.
  1. Accelerator pedal position sensor
  2. Open in EPA2 circuit
  3. ECM
P2138
Condition (a) or (b) continues for 2.0 seconds or more (1 trip detection logic):
(a) The difference between VPA and VPA2 is 0.02 V or less.
(b) VPA is 0.4 V or less and VPA2 is 1.2 V or less.
  1. Short between VPA and VPA2 circuit
  2. Accelerator pedal position sensor
  3. ECM

HINT:
When any of these DTCs are output, check the accelerator pedal position sensor voltage using the intelligent tester. Enter the following menus: Powertrain / Engine and ECT / Data List / Accel Sensor Out No. 1 and Accel Sensor Out No. 2.

Trouble Area
Accel Sensor Out No. 1
When Accelerator Pedal Released
Accel Sensor Out No. 2
When Accelerator Pedal Released
Accel Sensor Out No. 1
When Accelerator Pedal Depressed
Accel Sensor Out No. 2
When Accelerator Pedal Depressed
VCP circuit open
0 to 0.2 V
0 to 0.2 V
0 to 0.2 V
0 to 0.2 V
Open or ground short in VPA circuit
0 to 0.2 V
1.2 to 2.0 V
0 to 0.2 V
3.4 to 5.0 V
Open or ground short in VPA2 circuit
0.5 to 1.1 V
0 to 0.2 V
2.6 to 4.5 V
0 to 0.2 V
EPA circuit open
4.5 to 5.0 V
4.5 to 5.0 V
4.5 to 5.0 V
4.5 to 5.0 V
Normal condition
0.5 to 1.1 V
1.2 to 2.0 V
2.6 to 4.5 V
3.4 to 5.0 V
HINT:
Accelerator pedal positions are expressed as voltages.

FAIL-SAFE

When DTC P2120, P2121, P2122, P2123, P2125, P2127, P2128 or P2138 is stored, the ECM enters fail-safe mode. If either of the 2 sensor circuits malfunctions, the ECM uses the remaining circuit to calculate the accelerator pedal position to allow the vehicle to continue being driven. If both of the circuits malfunction, the ECM regards the accelerator pedal as being released. As a result, the throttle valve is closed and the engine idles. Fail-safe mode continues until a pass condition is detected and the ignition switch is turned off.

WIRING DIAGRAM


Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.3Zr-Fae Engine Control System.Sfi System. Dtc P2120 Throttle / Pedal Position Sensor / Switch D Circuit


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 (ACCELERATOR PEDAL POSITION SENSOR)


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.3Zr-Fae Engine Control System.Sfi System. Dtc P2120 Throttle / Pedal Position Sensor / Switch D Circuit

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON and turn the tester on.

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / Accel Sensor Out No. 1 and Accel Sensor Out No. 2.

  1. Read the value displayed on the tester.

    Standard Voltage:
    Accelerator Pedal Operation
    		Accel Sensor Out No. 1
    		Accel Sensor Out No. 2
    Released
    		0.5 to 1.1 V
    		1.2 to 2.0 V
    Depressed
    		2.6 to 4.5 V
    		3.4 to 5.0 V


NG
Go to step 2
OK

CHECK FOR INTERMITTENT PROBLEMS (RAV4_ACA30 RM000000PDQ0T1X.html)

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


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.3Zr-Fae Engine Control System.Sfi System. Dtc P2120 Throttle / Pedal Position Sensor / Switch D Circuit

  1. Disconnect the accelerator pedal position sensor 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
    A6-6 (VPA) - A12-55 (VPA)
    		Always
    		Below 1 Ω
    A6-5 (EPA) - A12-59 (EPA)
    		Always
    		Below 1 Ω
    A6-4 (VCPA) - A12-57 (VCPA)
    		Always
    		Below 1 Ω
    A6-3 (VPA2) - A12-56 (VPA2)
    		Always
    		Below 1 Ω
    A6-2 (EPA2) - A12-60 (EPA2)
    		Always
    		Below 1 Ω
    A6-1 (VCP2) - A12-58 (VCP2)
    		Always
    		Below 1 Ω
    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    A6-6 (VPA) or A12-55 (VPA) - Body ground
    		Always
    		10 kΩ or higher
    A6-5 (EPA) or A12-59 (EPA) - Body ground
    		Always
    		10 kΩ or higher
    A6-4 (VCPA) or A12-57 (VCPA) - Body ground
    		Always
    		10 kΩ or higher
    A6-3 (VPA2) or A12-56 (VPA2) - Body ground
    		Always
    		10 kΩ or higher
    A6-2 (EPA2) or A12-60 (EPA2) - Body ground
    		Always
    		10 kΩ or higher
    A6-1 (VCP2) or A12-58 (VCP2) - Body ground
    		Always
    		10 kΩ or higher
    Text in Illustration
    *1
    		Front view of wire harness connector
    (to Accelerator Pedal Position Sensor)
    *2
    		Front view of wire harness connector
    (to ECM)

  1. Reconnect the accelerator pedal position sensor connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (ACCELERATOR PEDAL POSITION SENSOR - ECM)
OK


3.CHECK ECM (VCPA AND VCP2 VOLTAGE)


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.3Zr-Fae Engine Control System.Sfi System. Dtc P2120 Throttle / Pedal Position Sensor / Switch D Circuit

  1. Disconnect the accelerator pedal position sensor connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A6-4 (VCPA) - A6-5 (EPA)
    		Ignition switch ON
    		4.5 to 5.5 V
    A6-1 (VCP2) - A6-2 (EPA2)
    		Ignition switch ON
    		4.5 to 5.5 V
    Text in Illustration
    *1
    		Front view of wire harness connector
    (to Accelerator Pedal Position Sensor)

  1. Reconnect the accelerator pedal position sensor connector.



NG
REPLACE ECM (RAV4_ACA30 RM0000017UO01KX.html)
OK


4.REPLACE ACCELERATOR PEDAL ROD

  1. Replace the accelerator pedal rod (RAV4_ACA30 RM0000017UL01VX.html).


NEXT


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

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON and turn the tester on.

  1. Clear the DTCs (RAV4_ACA30 RM000000PDK0WCX.html).

  1. Start the engine.

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

  1. Fully depress and release the accelerator pedal several times quickly.

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

  1. Read the DTCs.

    Result
    Result
    		Proceed to
    DTC P2120, P2122, P2123, P2125, P2127, P2128, and/or P2138 are output
    		A
    DTC is not output
    		B


B
END
A

REPLACE ECM (RAV4_ACA30 RM0000017UO01KX.html)