Dtc P2121 Throttle / Pedal Position Sensor / Switch D Circuit Range / Performance

Engine Hybrid System. Land Cruiser. Urj200, 202 Grj200 Vdj200
1Gr-Fe Engine Control. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

MONITOR DESCRIPTION

FAIL-SAFE

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FOR ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2121)

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

REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY

CHECK WHETHER DTC OUTPUT RECURS (DTC P2121)

DTC P2121 Throttle / Pedal Position Sensor / Switch "D" Circuit Range / Performance


DESCRIPTION

Refer to DTC P2120 (Click here).

DTC No.
DTC Detection Condition
Trouble Area
P2121
Either conditions (1) or (2) met for 0.5 seconds (1 trip detection logic):
  1. (1) Difference between VPA and VPA2 is less than 0.4 V, or more than 1.2 V. (learned value of accelerator off position)
  2. (2) Difference between VPA and VPA2 is greater than or equal to the specified value.
  1. Accelerator pedal sensor assembly
  2. ECM

MONITOR DESCRIPTION

When the difference between the output voltages of VPA and VPA2 deviates from the standard, the ECM determines that the accelerator pedal sensor assembly is malfunctioning. The ECM turns on the MIL and stores the DTC.

FAIL-SAFE

The accelerator pedal position sensor has 2 (main and sub) sensor circuits.
The ECM detects the abnormal signal voltage difference between the 2 sensor circuits and switches to fail-safe mode.
If the 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. In this case, the throttle valve remains closed as if the engine is idling.
If a pass condition is detected and then the ignition switch is turned off, the fail-safe operation stops and the system returns to normal.

WIRING DIAGRAM

Refer to DTC P2120 (Click here).

INSPECTION PROCEDURE

HINT:
  1. This DTC relates to the accelerator pedal sensor assembly.
  2. Read freeze frame data using the GTS. 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.
1.CHECK FOR ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2121)

  1. Connect the GTS to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the GTS on.

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

  1. Read the DTCs.

    Result
    Result
    		Proceed to
    P2121 is output
    		A
    P2121 and other DTCs are output
    		B
    HINT:
    If any DTCs other than P2121 are output, troubleshoot those DTCs first.


B
GO TO DTC CHART (Click here)
A


2.READ VALUE USING GTS (ACCEL SENSOR OUT NO.1 AND ACCEL SENSOR OUT NO.2)
Land Cruiser. Urj200, 202 Grj200 Vdj200.1Gr-Fe Engine Control.Sfi System. Dtc P2121 Throttle / Pedal Position Sensor / Switch D Circuit Range / Performance

  1. Connect the GTS to the DLC3.

  1. Turn the ignition switch to ON and turn the GTS 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 values displayed on the GTS.

    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 4.75 V
    Text in Illustration
    *a
    		Depressed
    *b
    		Released


NG
Go to step 3
OK

CHECK FOR INTERMITTENT PROBLEMS (Click here)

3.REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY

  1. Replace the accelerator pedal sensor assembly (Click here).


NEXT


4.CHECK WHETHER DTC OUTPUT RECURS (DTC P2121)

  1. Connect the GTS to the DLC3.

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

  1. Clear the DTCs (Click here).

  1. Start the engine.

  1. Allow the engine to idle for 15 seconds.

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

  1. Read the DTCs.

    Result
    Result
    		Proceed to
    P2121 is output
    		A
    No DTC is output
    		B


B
SYSTEM OK
A

REPLACE ECM (Click here)