Toyota Venza manuals

Toyota Venza: Throttle / Pedal Position Sensor / Switch "D" Circuit (P2120,P2122,P2123,P2125,P2127,P2128,P2138)

Toyota Venza Service Manual / 1ar-fe Engine Control / Sfi System / Throttle / Pedal Position Sensor / Switch "D" Circuit (P2120,P2122,P2123,P2125,P2127,P2128,P2138)

DESCRIPTION

HINT:

  • This Electronic Throttle Control System (ETCS) does not use a throttle cable.
  • These DTCs relate to the accelerator pedal sensor assembly.

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 sensor and 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 0.5 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 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 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 the 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 the 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 higher for 2.0 seconds or more (1 trip detection logic).

  • Accelerator pedal sensor assembly
  • Open in EPA circuit
  • ECM

P2125

VPA2 fluctuates rapidly beyond the 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 the 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

Both of the following conditions 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.

  • Accelerator pedal sensor assembly
  • Open in EPA2 circuit
  • ECM

P2138

Either of the following conditions 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.

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

HINT:

When any of these DTCs are output, check the accelerator pedal sensor assembly voltage using the Techstream. Enter the following menus: Powertrain / Engine / 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 Fully Depressed

Accel Sensor Out No. 2

When Accelerator Pedal Fully Depressed

Open in VCP 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 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 output voltage 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.

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 Correlation

Required Sensors/Components (Main)

Accelerator pedal position sensor assembly

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

Immediate

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever following DTCs not stored

None

Either of the following conditions is met:

-

1. Time after ignition switch off to ON

0.012 seconds or more

2. Command to electronic throttle actuator power

ON

TYPICAL MALFUNCTION THRESHOLDS

P2120

Either of the following conditions is met:

1 or 2

1. Both of the following conditions are met

(a) and (b)

(a) VPA voltage

0.4 V or less

(b) VPA2 voltage - Learned VPA2 accelerator off position voltage

0.04 V or higher

2. VPA voltage

4.8 V or higher

P2122

Both 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. Both of the following conditions are met

(a) and (b)

(a) VPA2 voltage

1.2 V or less

(b) 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

Both 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 conditions is met:

1 or 2

1. Difference between VPA and VPA 2 voltages

0.02 V or less

2. Both of the following conditions are met

-

VPA voltage

0.4 V or less

VPA2 voltage

1.2 V or less

COMPONENT OPERATING RANGE

All of the following conditions are met

-

VPA voltage

Higher than 0.4, and less than 4.8 V

VPA2 voltage

Higher than 1.2, 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 the DTCs (even if no DTCs are stored, perform the clear DTC procedure) (See page ).

  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 the 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 NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE or N/A, perform steps [B] and [C] again.
  13. If no pending DTC is output, perform a universal trip and check for permanent DTCs (See page ).

    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, P2121, P2122, P2123, P2125, P2127, P2128 and P2138 is stored, the ECM enters fail-safe mode. If either circuit 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:

  • These DTCs relate to the accelerator pedal position sensor.
  • 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 (ACCELERATOR PEDAL SENSOR ASSEMBLY)

(a) Connect the Techstream to the DLC3.


(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 value 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

Fully Released

0.5 to 1.1 V

1.2 to 2.0 V

More than 0.02 V

Fully Depressed

2.6 to 4.5 V

3.4 to 4.75 V

Text in Illustration

*a

Fully Depressed

*b

Fully Released


OK

CHECK FOR INTERMITTENT PROBLEMS


NG

2.

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

(a) Disconnect the accelerator pedal sensor assembly connector.

(b) Disconnect the 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

A32-6 (VPA) - A49-55 (VPA)

Always

Below 1 Ω

A32-5 (EPA) - A49-59 (EPA)

Always

Below 1 Ω

A32-4 (VCPA) - A49-57 (VCPA)

Always

Below 1 Ω

A32-3 (VPA2) - A49-56 (VPA2)

Always

Below 1 Ω

A32-2 (EPA2) - A49-60 (EPA2)

Always

Below 1 Ω

A32-1 (VCP2) - A49-58 (VCP2)

Always

Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection

Condition

Specified Condition

A32-6 (VPA) or A49-55 (VPA) - Body ground

Always

10 kΩ or higher

A32-5 (EPA) or A49-59 (EPA) - Body ground

Always

10 kΩ or higher

A32-4 (VCPA) or A49-57 (VCPA) - Body ground

Always

10 kΩ or higher

A32-3 (VPA2) or A49-56 (VPA2) - Body ground

Always

10 kΩ or higher

A32-2 (EPA2) or A49-60 (EPA2) - Body ground

Always

10 kΩ or higher

A32-1 (VCP2) or A49-58 (VCP2) - Body ground

Always

10 kΩ or higher


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

3.

CHECK 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

A32-4 (VCPA) - A32-5 (EPA)

Ignition switch ON

4.5 to 5.5 V

A32-1 (VCP2) - A32-2 (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 ASSEMBLY

(a) Replace the accelerator pedal assembly (See page ).



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 ).


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

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

(g) Enter the following menus: Powertrain / Engine / Trouble Codes.

(h) Read the DTCs.

Result

Proceed to

DTC P2120, P2122, P2123, P2125, P2127, P2128, and/or P2138 are output

A

DTC is not output

B


A

REPLACE ECM


B

END

Throttle Actuator Control Throttle Body Range / Performance (P2119)
DESCRIPTION The electronic throttle control system is composed of the throttle actuator, throttle position sensor, accelerator pedal position sensor, and ECM. The ECM operates the throttle actuat ...

Throttle / Pedal Position Sensor / Switch "D" Circuit Range / Performance (P2121)
DESCRIPTION Refer to DTC P2120 (See page ). HINT: This DTC relates to the accelerator pedal sensor assembly. DTC No. DTC Detection Condition Trouble Area ...

Other materials about Toyota Venza:

Disassembly
DISASSEMBLY PROCEDURE 1. REMOVE ULTRASONIC SENSOR CLIP (w/ Intuitive Parking Assist System) 2. REMOVE NO. 1 ULTRASONIC SENSOR (w/ Intuitive Parking Assist System) 3. REMOVE NO. 1 ULTRASONIC SENSOR RETAINER (w/ Intuitive Parking Assist System) 4. ...

Reassembly
REASSEMBLY PROCEDURE 1. INSTALL NO. 2 STEERING RACK BOOT (a) Apply lithium soap base glycol grease to the inside of the small opening of a new No. 2 steering rack boot. (b) Install the No. 2 ste ...

Diagnosis System
DIAGNOSIS SYSTEM 1. DESCRIPTION (a) When troubleshooting a vehicle with a diagnosis system, the only difference from the usual troubleshooting procedure is connecting the Techstream to the vehicle and reading various data output from the clearance warnin ...

© 2016-2019 Copyright www.tovenza.com

0.1954