Toyota Tundra Service Manual: Throttle / Pedal Position Sensor / Switch "A" Circuit (P0120-P0123,P0220,P0222,P0223,P2135)

Toyota Tundra Service Manual / Engine, Hybrid System / 1ur-fe Engine Control / Sfi System / Throttle / Pedal Position Sensor / Switch "A" Circuit (P0120-P0123,P0220,P0222,P0223,P2135)

DESCRIPTION

The TP sensor is mounted on the throttle with motor 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 as well as very low speeds.

The TP sensor has 2 sensor circuits, each of which transmits 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.

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)

  • Throttle Position (TP) sensor (built into throttle with motor body assembly)
  • ECM

P0121

Difference between VTA1 and VTA2 voltages less than 0.8 V, or more than 1.6 V for 2 seconds

(1 trip detection logic)

  • Throttle Position (TP) sensor (built into throttle with motor body assembly)
  • Throttle position sensor circuit
  • ECM

P0122

Output voltage of VTA1 0.2 V or less for 2 seconds when accelerator pedal depressed

(1 trip detection logic)

  • TP sensor (built into throttle with motor body assembly)
  • Short in VTA1 circuit
  • Open in VC circuit
  • ECM

P0123

Output voltage of VTA1 4.535 V or more for 2 seconds when accelerator pedal depressed

(1 trip detection logic)

  • TP sensor (built into throttle with motor body assembly)
  • Open in VTA1 circuit
  • Open in E2 circuit
  • Short between VC and VTA1 circuits
  • 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)

  • TP sensor (built into throttle with motor body assembly)
  • ECM

P0222

Output voltage of VTA2 1.75 V or less for 2 seconds when accelerator pedal depressed

(1 trip detection logic)

  • TP sensor (built into throttle with motor body assembly)
  • Short in VTA2 circuit
  • Open in VC circuit
  • 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)

  • TP sensor (built into throttle with motor body assembly)
  • Open in VTA2 circuit
  • Open in E2 circuit
  • Short between VC and VTA2 circuits
  • 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

  • Short between VTA1 and VTA2 circuits
  • TP sensor (built into throttle with motor body assembly)
  • ECM

HINT:

  • When any of these DTCs are stored, check the throttle valve opening angle by entering the following menus: Powertrain / Engine and ECT / Data List / Throttle Position No. 1 and Throttle Position No. 2.
  • Throttle Position No. 1 is the VTA1 signal, and Throttle Position No. 2 is the VTA2 signal.

    Reference (Normal Condition):

    Tester Display

    Accelerator Pedal Fully Released

    Accelerator Pedal Fully Depressed

    Throttle Position No. 1

    0.5 to 1.1 V

    3.2 to 4.8 V

    Throttle Position No. 2

    2.1 to 3.1 V

    4.6 to 4.98 V

MONITOR DESCRIPTION

The ECM uses the Throttle Position (TP) sensor to monitor the throttle valve opening angle. There are several checks that the ECM performs to confirm proper operation of the TP sensor.

P0120, P0122, P0123, P0220, P0222, P0223 and P2135
  • A specific voltage difference is expected between the sensor terminals, VTA1 and VTA2, for each throttle valve opening angle. If the difference between VTA1 and VTA2 is incorrect, the ECM interprets this as a malfunction in the sensor, and stores a DTC.
  • VTA1 and VTA2 each have a specific voltage range. If VTA1 or VTA2 is outside the normal operating range, the ECM interprets this as a malfunction in the sensor, and stores a DTC.
  • VTA1 and VTA2 should never be close to the same voltage level. If VTA1 is within 0.02 V of VTA2, the ECM determines that there is a short circuit in the sensor, and stores a DTC.

If the malfunction is not repaired successfully, a DTC is stored 10 seconds after the engine is next started.

P0121
  • This sensor transmits two signals: VTA1 and VTA2. VTA1 is used to detect the throttle opening angle and VTA2 is used to detect malfunctions in VTA1. The ECM performs several checks to confirm proper operation of the TP sensor and VTA1.

    For each throttle opening angle, a specific voltage difference is expected between the outputs of VTA1 and VTA2. If the output voltage difference between the two signals deviates from the normal operating range, the ECM interprets this as a malfunction of the TP sensor. The ECM illuminates the MIL and stores the DTC.

    If the malfunction is not repaired successfully, the DTC is stored 2 seconds after the engine is next started.

MONITOR STRATEGY

Related DTCs

P0120: Throttle position sensor 1 range check (Fluctuating)

P0121: TP sensor rationality

P0122: Throttle position sensor 1 range check (Low voltage)

P0123: Throttle position sensor 1 range check (High voltage)

P0220: Throttle position sensor 2 range check (Fluctuating)

P0222: Throttle position sensor 2 range check (Low voltage)

P0223: Throttle position sensor 2 range check (High voltage)

P2135: Throttle position sensor range check (Correlation)

Required Sensors/Components (Main)

Throttle position sensor

Required Sensors/Components (Related)

-

Frequency of Operation

Continuous

Duration

2 seconds: P0120, P0121, P0122, P0123, P0220, P0222 and P0223

0.5 seconds: P2135 Case 1

0.4 seconds: P2135 Case 2

MIL Operation

Immediate

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

P0120, P0122, P0123, P0220, P0222, P0223 and P2135

Monitor runs whenever following DTCs not present

None

Either of following conditions A or B met

-

A. Ignition switch ON

0.012 seconds or more

B. Electronic throttle actuator power

ON

P0121

Monitor runs whenever following DTCs not present

P0120, P0122, P0123, P0220, P0222, P0223, P2135 (Throttle position sensor)

Either of following conditions A or B met

-

A. Ignition switch

ON

B. Electronic throttle actuator power

ON

TYPICAL MALFUNCTION THRESHOLDS

P0120

VTA1 voltage

0.2 V or less, or 4.535 V or more

P0121

When either condition below is met:

-

Difference of learned TP sensor opener position voltage between VTA2 and VTA1

Higher than 1.6 V

Difference of learned TP sensor opener position voltage between VTA2 and VTA1

Below 0.8 V

P0122

VTA1 voltage

0.2 V or less

P0123

VTA1 voltage

4.535 V or higher

P0220

Either of following conditions A or B met

-

A. VTA2 voltage

1.75 V or less

B. All of the following conditions are met

-

VTA2 voltage

4.8 V or higher

VTA1 voltage

0.2 to 2.02 V

P0222

VTA2 voltage

1.75 V or less

P0223

All of the following conditions are met

-

VTA2 voltage

4.8 V or higher

VTA1 voltage

0.2 to 2.02 V

P2135 Case 1

Difference between VTA1 and VTA2 voltages

0.02 V or less

P2135 Case 2

All of the following conditions are met

-

VTA1 voltage

0.2 V or less

VTA2 voltage

1.75 V or less

COMPONENT OPERATING RANGE

VTA1 voltage

0.2 to 4.54 V

VTA2 voltage

1.75 to 4.8 V

Difference between VTA1 and VTA2 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 operation).
  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. Start the engine.
  7. With the vehicle stationary, fully depress and release the accelerator pedal [B].
  8. Idle the engine for 2 seconds or more [C].
  9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [D].
  10. 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.
  11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
  12. Input the DTC: P0120, P0121, P0122, P0123, P0220, P0222, P0223 or P2135.
  13. Check the DTC judgment result.

    Tester 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 [D] again.
  14. 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 these DTCs, as well as other DTCs relating to ETCS (Electronic Throttle Control System) malfunctions are stored, the ECM enters fail-safe mode. During fail-safe mode, the ECM cuts the current to the throttle actuator and the throttle valve is returned to a 7° 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

CAUTION / NOTICE / HINT

HINT:

  • These DTCs relate to the Throttle Position (TP) sensor.
  • Read freeze frame data using the Techstream. 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.

PROCEDURE

1.

READ VALUE USING TECHSTREAM (THROTTLE POSITION)

(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 and ECT / Data List / Throttle Position No. 1 and Throttle Position No. 2.

(e) Check the values displayed on the Techstream.

Result

Throttle Position No. 1 (VTA1)

When Accelerator Pedal Released

Throttle Position No. 2 (VTA2)

When Accelerator Pedal Released

Throttle Position No. 1 (VTA1)

When Accelerator Pedal Depressed

Throttle Position No. 2 (VTA2)

When Accelerator Pedal Depressed

Trouble Area

Proceed to

0 to 0.2 V

0 to 0.2 V

0 to 0.2 V

0 to 0.2 V

VC circuit open

A

4.5 to 4.98 V

4.5 to 4.98 V

4.5 to 4.98 V

4.5 to 4.98 V

E2 circuit open

A

0 to 0.2 V,

or 4.5 to 4.98 V

2.1 to 3.1 V

(Fail-safe)

0 to 0.2 V,

or 4.5 to 4.98 V

2.1 to 3.1 V

(Fail-safe)

VTA1 circuit open or ground short

A

0.6 to 1.4 V

(Fail-safe)

0 to 0.2 V,

or 4.5 to 4.98 V

0.6 to 1.4 V

(Fail-safe)

0 to 0.2 V,

or 4.5 to 4.98 V

VTA2 circuit open or ground short

A

0.5 to 1.1 V

2.1 to 3.1 V

3.2 to 4.8 V

(Not fail-safe)

4.6 to 4.98 V

(Not fail-safe)

TP sensor circuit normal

B

HINT:

  • DTC P0121 is stored when the VTA1 and VTA2 output voltages are not consistent with the sensor characteristics. Therefore, check the freeze frame data when this DTC is stored. Use the following formula to confirm the relative differences in voltage.

    Calculate the voltage of VTA1 and VTA2 according to Throttle Sensor Volt % and Throttle Sensor #2 Volt % respectively and confirm their consistency.

    Example:

    Throttle Sensor Volt % / 100 (%) x 5 (V) = Throttle Position No. 1

    Characteristic Sensor Output:

    VTA2 x 0.8 is approximately equal to VTA1 + 1.11 V

    VTA1: Throttle Position No. 1

    VTA2: Throttle Position No. 2

  • If DTC P0121 is output, proceed to "CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)".
B

GO TO STEP 5

A

2.

CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)

(a) Disconnect the throttle with motor body assembly connector.

(b) Disconnect the ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D9-5 (VC) - D74-80 (VCTA)

Always

Below 1 Ω

D9-6 (VTA) - D74-78 (VTA1)

Always

Below 1 Ω

D9-4 (VTA2) - D74-77 (VTA2)

Always

Below 1 Ω

D9-3 (E2) - D74-79 (ETA)

Always

Below 1 Ω

D9-5 (VC) or D74-80 (VCTA) - Body ground

Always

10 kΩ or higher

D9-6 (VTA) or D74-78 (VTA1) - Body ground

Always

10 kΩ or higher

D9-4 (VTA2) or D74-77 (VTA2) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

INSPECT ECM (VC VOLTAGE)

(a) Disconnect the throttle with motor body 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

D9-5 (VC) - D9-3 (E2)

Ignition switch ON

4.5 to 5.5 V

NG

REPLACE ECM

OK

4.

REPLACE THROTTLE WITH MOTOR BODY ASSEMBLY

(a) Replace the throttle with motor body assembly (See page ).

HINT:

Perform "Inspection After Repair" after replacing the throttle with motor body assembly (See page ).

NEXT

5.

CHECK WHETHER DTC OUTPUT RECURS (THROTTLE POSITION SENSOR DTCS)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Clear DTCs (See page ).

(e) Start the engine.

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

(g) Read the output DTCs.

Result

Result

Proceed to

P0120, P0121, P0122, P0123, P0220, P0222, P0223 and/or P2135 is output

A

No DTC is output

B

A

REPLACE ECM

B

END

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