Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VIAY
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 - 08/2016]
Title: 2GR-FE (ENGINE CONTROL): SFI SYSTEM: P2120,P2122,P2123,P2125,P2127,P2128,P2138; Throttle / Pedal Position Sensor / Switch "D" Circuit; 2016 MY Sienna [12/2015 - 08/2016]

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

DESCRIPTION

HINT:

  • These DTCs relate to the accelerator pedal sensor assembly.
  • This electronic throttle control system does not use a throttle cable.

The accelerator pedal sensor assembly 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 conditions. The voltage, which is applied to terminals VPA and VPA2 of the ECM, varies between 0.5 V and 4.75 V in proportion to the operating angle of the accelerator pedal (throttle valve). A signal from VPA indicates the actual accelerator pedal operating angle (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 sensor assembly itself.

The ECM monitors the actual accelerator pedal operating angle (throttle valve opening angle) through the signals from VPA and VPA2, and controls the throttle actuator according to these signals.

DTC No.

DTC Detection Condition

Trouble Area

P2120

VPA fluctuates rapidly beyond upper and lower malfunction thresholds for 0.5 seconds or more

(1 trip detection logic)
  • Accelerator pedal sensor assembly
  • ECM

P2122

VPA is 0.4 V or less for 0.5 seconds or more when accelerator pedal is depressed

(1 trip detection logic)
  • Accelerator pedal sensor assembly
  • Open in VCPA circuit
  • Open or ground short in VPA circuit
  • ECM

P2123

VPA is 4.8 V or more for 2.0 seconds or more

(1 trip detection logic)
  • Accelerator pedal sensor assembly
  • Open in EPA circuit
  • ECM

P2125

VPA2 fluctuates rapidly beyond upper and lower malfunction thresholds for 0.5 seconds or more

(1 trip detection logic)
  • Accelerator pedal sensor assembly
  • ECM

P2127

VPA2 is 1.2 V or less for 0.5 seconds or more when accelerator pedal is depressed

(1 trip detection logic)
  • Accelerator pedal sensor assembly
  • Open in VCP2 circuit
  • Open or ground short in VPA2 circuit
  • ECM

P2128

Conditions (a) and (b) continue for 2.0 seconds or more

(1 trip detection logic):

(a) VPA2 is 4.8 V or more

(b) VPA is between 0.4 V and 3.45 V
  • Accelerator pedal sensor assembly
  • Open in EPA2 circuit
  • ECM

P2138

Condition (a) or (b) continues for 2.0 seconds or more

(1 trip detection logic):

(a) 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
  • Short between VPA and VPA2 circuits
  • Accelerator pedal sensor assembly
  • ECM

HINT:

When any of these DTCs are stored, check the accelerator pedal sensor assembly voltage by entering the following menus: Powertrain / Engine / Data List / Accel Sensor Out No. 1 and Accel Sensor Out No. 2.

Trouble Area

Accelerator Sensor Out No. 1

When Accelerator Pedal Released

Accelerator Sensor Out No. 2

When Accelerator Pedal Released

Accelerator Sensor Out No. 1

When Accelerator Pedal Depressed

Accelerator Sensor Out No. 2

When Accelerator Pedal Depressed

Open in VCPA or VCP2 circuit

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 4.75 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

Open in EPA or EPA2 circuit

4.5 to 4.98 V

4.5 to 4.98 V

4.5 to 4.98 V

4.5 to 4.98 V

Normal condition

0.5 to 1.1 V

1.2 to 2.0 V

2.6 to 4.5 V

3.4 to 4.75 V

HINT:

Accelerator pedal positions are expressed as voltages.

MONITOR DESCRIPTION

  • When either of the output voltages of VPA or VPA2 deviates from the standard range, or the difference between the output voltages of the 2 sensor circuits is less than the threshold, the ECM determines that there is a malfunction in the accelerator pedal position sensor. The ECM then illuminates the MIL and stores a DTC.
    • Example:
      • When the output voltage of VPA drops below 0.4 V for more than 0.5 seconds when the accelerator pedal is fully depressed, DTC P2122 is stored.
      • If the malfunction is not repaired successfully, a DTC is stored 2 seconds after the engine is next started.

MONITOR STRATEGY

Related DTCs

P2120: Accelerator pedal position sensor 1 range check (chattering)

P2122: Accelerator pedal position sensor 1 range check (low voltage)

P2123: Accelerator pedal position sensor 1 range check (high voltage)

P2125: Accelerator pedal position sensor 2 range check (chattering)

P2127: Accelerator pedal position sensor 2 range check (low voltage)

P2128: Accelerator pedal position sensor 2 range check (high voltage)

P2138: Accelerator pedal position sensor range check (correlation)

Required Sensors/Components (Main)

Accelerator pedal position sensor

Required Sensors/Components (Related)

-

Frequency of Operation

Continuous

Duration

0.5 seconds: P2120, P2122, P2125 and P2127

2.0 seconds: P2123, P2128 and P2138

MIL Operation

Immediately

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever following DTCs are not present

None

Either of the following conditions is met

A or B

A. Time after ignition switch off to ON

0.012 seconds or more

B. Command to electronic throttle actuator power

ON

TYPICAL MALFUNCTION THRESHOLDS

P2120

Either of the following conditions is met:

1 or 2

1. All of the following conditions are met

-

VPA voltage

0.4 V or less

VPA2 voltage - Learned VPA2 accelerator off position voltage

0.04 V or higher

2. VPA voltage

4.8 V or higher

P2122

All of the following conditions are met

-

VPA voltage

0.4 V or less

VPA2 voltage - Learned VPA2 accelerator off position voltage

0.04 V or higher

P2123

VPA voltage

4.8 V or higher

P2125

Either of the following conditions is met:

1 or 2

1. All of the following conditions are met

-

VPA2 voltage

1.2 V or less

VPA voltage - Learned VPA accelerator off position voltage

0.04 V or higher

2. VPA2 voltage when VPA voltage 0.4 to 3.45 V

4.8 V or higher

P2127

All of the following conditions are met

-

VPA2 voltage

1.2 V or less

VPA voltage - Learned VPA accelerator off position voltage

0.04 V or higher

P2128

VPA2 voltage when VPA voltage 0.4 to 3.45 V

4.8 V or higher

P2138

Either of the following condition is met:

A or B

A. Difference between VPA and VPA 2 voltages

0.02 V or less

B. All of the following conditions are met

-

VPA voltage

0.4 V or less

VPA2 voltage

1.2 V or less

COMPONENT OPERATING RANGE

VPA voltage

Higher than 0.4 V, and less than 4.8 V

VPA2 voltage

Higher than 1.2 V, and less than 4.8 V

Difference between VPA and VPA2 voltages

Higher than 0.02 V

CONFIRMATION DRIVING PATTERN

  1. Connect the Techstream to the DLC3.
  2. Turn the ignition switch to ON and turn the Techstream on.
  3. Clear DTCs (even if no DTCs are stored, perform the clear DTC procedure) (See page 2016 MY Sienna [12/2015 - 08/2016]; 2GR-FE (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR ).
  4. Turn the ignition switch off and wait for at least 30 seconds.
  5. Turn the ignition switch to ON and turn the Techstream on [A].
  6. Fully depress and release the accelerator pedal [B].
  7. Check that 5 seconds or more have elapsed since the DTCs were cleared.
  8. Enter the following menus: Powertrain / Engine / Trouble Codes [C].
  9. Read pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
  10. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
  11. Input the DTC: P2120, P2122, P2123, P2125, P2127, P2128 or P2138.
  12. Check the DTC judgment result.

    Techstream Display

    Description

    NORMAL
    • DTC judgment completed
    • System normal

    ABNORMAL
    • DTC judgment completed
    • System abnormal

    INCOMPLETE
    • DTC judgment not completed
    • Perform driving pattern after confirming DTC enabling conditions

    N/A
    • Unable to perform DTC judgment
    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE or N/A, perform steps [B] through [C] again.
  13. If no pending DTC is output, perform a universal trip and check for permanent DTCs (See page 2016 MY Sienna [12/2015 - 08/2016]; 2GR-FE (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR ).

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTC is output, the system is normal.

FAIL-SAFE

When any of DTCs P2120, P2122, P2123, P2125, P2127, P2128 and P2138 are stored, the ECM enters fail-safe mode. If either of the 2 sensor circuits malfunctions, the ECM limits the engine output. 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

CAUTION / NOTICE / HINT

HINT:

Read freeze frame data using the Techstream. 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.

PROCEDURE

1.

READ VALUE USING TECHSTREAM (ACCEL SENSOR OUT NO. 1 AND ACCEL SENSOR OUT NO. 2)

(a) Connect the Techstream to the DLC3.

Text in Illustration

*a

Depressed

*b

Released

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

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

(e) Read the values displayed on the Techstream.

Standard Voltage:

Accelerator Pedal Operation

Accel Sensor Out No. 1

Accel Sensor Out No. 2

Difference between Accel Sensor Out No. 1 and Accel Sensor Out No. 2

Released

0.5 to 1.1 V

1.2 to 2.0 V

More than 0.02 V

Depressed

2.6 to 4.5 V

3.4 to 4.75 V
OK

CHECK FOR INTERMITTENT PROBLEMS

NG

2.

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

(a) Disconnect the A57 accelerator pedal sensor assembly connector.

(b) Disconnect the A39 ECM connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance (Check for Open):

Tester Connection

Condition

Specified Condition

A57-6 (VPA) - A39-55 (VPA)

Always

Below 1 Ω

A57-5 (EPA) - A39-58 (EPA)

Always

Below 1 Ω

A57-4 (VCPA) - A39-57 (VCPA)

Always

Below 1 Ω

A57-3 (VPA2) - A39-56 (VPA2)

Always

Below 1 Ω

A57-2 (EPA2) - A39-60 (EPA2)

Always

Below 1 Ω

A57-1 (VCP2) - A39-59 (VCP2)

Always

Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection

Condition

Specified Condition

A57-6 (VPA) or A39-55 (VPA) - Body ground

Always

10 kΩ or higher

A57-5 (EPA) or A39-58 (EPA) - Body ground

Always

10 kΩ or higher

A57-4 (VCPA) or A39-57 (VCPA) - Body ground

Always

10 kΩ or higher

A57-3 (VPA2) or A39-56 (VPA2) - Body ground

Always

10 kΩ or higher

A57-2 (EPA2) or A39-60 (EPA2) - Body ground

Always

10 kΩ or higher

A57-1 (VCP2) or A39-59 (VCP2) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

3.

INSPECT ECM (VCPA AND VCP2 VOLTAGE)

(a) Disconnect the accelerator pedal sensor assembly connector.

(b) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

A57-4 (VCPA) - A57-5 (EPA)

Ignition switch ON

4.5 to 5.5 V

A57-1 (VCP2) - A57-2 (EPA2)

Ignition switch ON

4.5 to 5.5 V

Text in Illustration

*a

Front view of wire harness connector

(to Accelerator Pedal Sensor Assembly)
NG

REPLACE ECM

OK

4.

REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY

(a) Replace the accelerator pedal sensor assembly (See page 2016 MY Sienna [12/2015 - 08/2016]; 2GR-FE (ENGINE CONTROL): ACCELERATOR PEDAL: REMOVAL ).

NEXT

5.

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

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Clear the DTCs (See page 2016 MY Sienna [12/2015 - 08/2016]; 2GR-FE (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR ).

Turn the ignition switch off and wait for at least 30 seconds.

(e) Turn the ignition switch to ON and turn the Techstream on.

(f) Start the engine and warm it up.

(g) Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.

(h) Enter the following menus: Powertrain / Engine / Utility / All Readiness.

(i) Input the DTC: P2120, P2122, P2123, P2125, P2127, P2128 or P2138.

(j) Check the DTC judgment result.

Result

Result

Proceed to

NORMAL (DTC is not output)

A

ABNORMAL (DTC P2120, P2122, P2123, P2125, P2127, P2128 or P2138 is output)

B
A

END
B

REPLACE ECM