Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Throttle/Pedal Position Sensor/Switch "D" Circuit Voltage Out of Range (P21201C,P212099)

Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual / Engine & Hybrid System / 2gr-fks (engine Control) / Sfi System / Throttle/Pedal Position Sensor/Switch "D" Circuit Voltage Out of Range (P21201C,P212099)

DESCRIPTION

Refer to DTC P212012.

Click here

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P21201C

Throttle/Pedal Position Sensor/Switch "D" Circuit Voltage Out of Range

Difference between VPA and VPA2 is greater than or equal to the specified value for 0.5 seconds (1 trip detection logic).
  • Accelerator pedal sensor assembly
  • ECM

Comes on

DTC stored

SAE Code: P2121

P212099

Throttle/Pedal Position Sensor/Switch "D" Exceeded Learning Limit

Difference between VPA and VPA2 is less than 0.4 V, or higher than 1.2 V (learned value of accelerator off position) (1 trip detection logic).
  • Accelerator pedal sensor assembly
  • ECM

Comes on

DTC stored

SAE Code: P2121

MONITOR DESCRIPTION

The accelerator pedal position sensor is mounted on the accelerator pedal bracket. The accelerator pedal position sensor has 2 sensor elements and 2 signal outputs: VPA and VPA2. VPA is used to detect the actual accelerator pedal angle (used for engine control) and VPA2 is used to detect malfunctions in VPA. When the difference between the output voltages of VPA and VPA2 deviates from the standard, the ECM determines that the accelerator pedal position sensor is malfunctioning, illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Related DTCs

P2121: Accelerator pedal position sensor rationality

Required Sensors/Components (Main)

Accelerator pedal sensor assembly

Required Sensors/Components (Related)

-

Frequency of Operation

Continuous

Duration

-: Case 1

0.5 seconds: Case 2

MIL Operation

Immediate

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever the following DTCs are not stored

None

Accelerator pedal position sensor circuit fail (P2120, P2122, P2123, P2125, P2127, P2128, P2138)

Not detected

TYPICAL MALFUNCTION THRESHOLDS

Case 1

Difference between VPA voltage and VPA2 voltage (learned value of accelerator off position)

Less than 0.4 V, or higher than 1.2 V
Case 2

All of the following conditions are met

-

[(VPA voltage - Learned VPA accelerator off position voltage) - (VPA2 voltage - Learned VPA2 accelerator off position voltage)]

0.165 V or higher (varies with accelerator position)

VPA2 voltage

Less than 4.84 V

Either of following conditions met:

(a) or (b)

(a) VPA voltage - Learned VPA accelerator off position voltage

0.04 V or higher

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

0.04 V or higher

CONFIRMATION DRIVING PATTERN

HINT:

  • After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

    Click here

  • When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

    Click here

  1. Connect the Techstream to the DLC3.
  2. Turn the engine switch on (IG).
  3. Turn the Techstream on.
  4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  5. Turn the engine switch off and wait for at least 30 seconds.
  6. Turn the engine switch on (IG) [A].
  7. Turn the Techstream on.
  8. Wait for 5 seconds after turning the engine switch on (IG).
  9. Operate the accelerator pedal in accordance with the following procedure [B].
    1. Enter the following menus: Powertrain / Engine / Data List / Accelerator Position Sensor No.1 Voltage % and Accelerator Position Sensor No.2 Voltage %.
    2. Slowly depress the accelerator pedal until Accelerator Position Sensor No.1 Voltage % is approximately 30% and Accelerator Position Sensor No.2 Voltage % is approximately 46%, then slowly release the accelerator pedal.
  10. Enter the following menus: Powertrain / Engine / Trouble Codes [C].
  11. 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.
  12. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
  13. Input the DTC: P21201C or P212099.
  14. 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

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result is ABNORMAL, the system is malfunctioning.
    • If the judgment result is INCOMPLETE, perform steps [B] through [C] again.
    • [A] to [C]: Normal judgment procedure.

      The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

    • When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

FAIL-SAFE

When DTC P212012, P212014, P21201C, P21201F, P212099, P212512, P212514, P21251F or P21382B is 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.

If a pass condition is detected and then the engine switch is turned off, the fail-safe operation stops and the system returns to normal.

WIRING DIAGRAM

Refer to DTC P212012.

Click here

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.

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P21201C AND/OR P212099)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

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

(e) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result

Proceed to

DTC P21201C and/or P212099 are output

A

DTC P21201C and/or P212099 and other DTCs are output

B

HINT:

If any DTCs other than P21201C and/or P212099 are output, troubleshoot those DTCs first.

B

GO TO DTC CHART

A

2.

READ VALUE USING TECHSTREAM (ACCELERATOR PEDAL POSITION SENSOR)

*a

Fully Depressed

*b

Fully Released

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Data List / Accelerator Position Sensor No.1 Voltage and Accelerator Position Sensor No.2 Voltage.

Powertrain > Engine > Data List

Tester Display

Accelerator Position Sensor No.1 Voltage

Accelerator Position Sensor No.2 Voltage

(e) Read the values displayed on the Techstream.

Standard Voltage:

Accelerator Pedal Operation

Accelerator Position Sensor No.1 Voltage

Accelerator Position Sensor No.2 Voltage

Fully Released

0.5 to 1.1 V

1.2 to 2.0 V

Fully Depressed

2.6 to 4.5 V

3.4 to 4.75 V
OK

CHECK FOR INTERMITTENT PROBLEMS

NG

3.

REPLACE ACCELERATOR PEDAL(W/SENSOR) ROD ASSEMBLY

(a) Replace the accelerator pedal sensor assembly.

Click here

NEXT

4.

CHECK WHETHER DTC OUTPUT RECURS (DTC P21201C AND/OR P212099)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Clear the DTCs.

Powertrain > Engine > Clear DTCs

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

(f) Turn the engine switch on (IG).

(g) Turn the Techstream on.

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

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

(j) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result

Proceed to

DTCs are not output

A

DTC P21201C and/or P212099 are output

B
A

END
B

REPLACE ECM

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