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


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING INTELLIGENT TESTER (ACCELERATOR PEDAL POSITION SENSOR)

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

REPLACE ACCELERATOR PEDAL ROD ASSEMBLY

CHECK WHETHER DTC OUTPUT RECURS (DTC P2121)

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

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


DESCRIPTION

Refer to DTC P2120 (LandCruiser RM0000018WX0AJX_01.html).

P2121
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
Ignition switch ON
  1. Accelerator pedal fully released for 3 seconds
  2. Accelerator pedal depressed partway for 3 seconds
  3. Accelerator pedal fully depressed for 3 seconds
The difference between VPA and VPA2 is less than 0.4 V, or more than 1.2 V for 0.5 seconds (1 trip detection logic).
  1. Accelerator pedal position sensor circuit
  2. Accelerator pedal position sensor
  3. ECM

Related Data List
DTC No.
Data List
P2121
  1. Accel Position
  2. Accel Sens. No.1 Volt %
  3. Accel Sens. No.2 Volt %

WIRING DIAGRAM

Refer to DTC P2120 (LandCruiser RM0000018WX0AJX_02.html).

INSPECTION PROCEDURE

NOTICE:
After replacing the ECM, the new ECM needs registration (LandCruiser RM0000012XK0ARX.html) and initialization (LandCruiser RM000000TIN08CX.html).
HINT:
Read freeze frame data using the intelligent tester. 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, and other data from the time the malfunction occurred.
1.READ VALUE USING INTELLIGENT TESTER (ACCELERATOR PEDAL POSITION SENSOR)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Kd-Ftv Engine Control.Ecd System. Dtc P2121 Throttle / Pedal Position Sensor / Switch D Circuit Range / Performance

  1. Connect the intelligent tester to the DLC3.

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

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / Accel Sens. No.1 Volt % and Accel Sens. No.2 Volt %.

  1. Read the values.

    Standard Voltage:
    Accelerator Pedal
    		Accel Sens. No.1 Volt %
    		Accel Sens. No.2 Volt %
    Released
    		8 to 28%
    		51 to 86%
    Depressed
    		30 to 55%
    		73 to 98%
    Text in Illustration
    *1
    		Accelerator pedal assembly
    *a
    		Depressed
    *b
    		Released
    Result
    Result
    		Proceed to
    NG
    		A
    OK
    		B


B
Go to step 7
A


2.CHECK HARNESS AND CONNECTOR (ACCELERATOR PEDAL POSITION SENSOR - ECM)

  1. Disconnect the accelerator pedal position sensor connector.

  1. Disconnect the ECM connector.

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

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    A19-1 (VCP2) - G58-4 (VCP2)
    		Always
    		Below 1 Ω
    A19-2 (EPA2) - G58-3 (EPA2)
    		Always
    		Below 1 Ω
    A19-3 (VPA2) - G57-1 (VPA2)
    		Always
    		Below 1 Ω
    A19-4 (VCPA) - G58-6 (VCPA)
    		Always
    		Below 1 Ω
    A19-5 (EPA) - G58-5 (EPA)
    		Always
    		Below 1 Ω
    A19-6 (VPA) - G57-2 (VPA)
    		Always
    		Below 1 Ω
    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    A19-1 (VCP2) or G58-4 (VCP2) - Body ground
    		Always
    		10 kΩ or higher
    A19-2 (EPA2) or G58-3 (EPA2) - Body ground
    		Always
    		10 kΩ or higher
    A19-3 (VPA2) or G57-1 (VPA2) - Body ground
    		Always
    		10 kΩ or higher
    A19-4 (VCPA) or G58-6 (VCPA) - Body ground
    		Always
    		10 kΩ or higher
    A19-5 (EPA) or G58-5 (EPA) - Body ground
    		Always
    		10 kΩ or higher
    A19-6 (VPA) or G57-2 (VPA) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the accelerator pedal position sensor connector.

  1. Reconnect the ECM connector.



NG
Go to step 6
OK


3.REPLACE ACCELERATOR PEDAL ROD ASSEMBLY

  1. Replace the accelerator pedal rod assembly (LandCruiser RM00000463000BX.html).


NEXT


4.CHECK WHETHER DTC OUTPUT RECURS (DTC P2121)

  1. Connect the intelligent tester to the DLC3.

  1. Clear the DTCs (LandCruiser RM000000PDK1DJX.html).

  1. Turn the ignition switch to ON.

  1. Fully release the accelerator pedal for 3 seconds or more, then depress it partway for 3 seconds or more, and then fully depress it for 3 seconds or more.

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

  1. Read the DTCs.

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


B
END
A


5.REPLACE ECM

  1. Replace the ECM (LandCruiser RM0000013Z002CX.html).



NEXT
Go to step 7

6.REPAIR OR REPLACE HARNESS OR CONNECTOR

  1. Repair or replace the harness or connector.


NEXT


7.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

  1. Connect the intelligent tester to the DLC3.

  1. Clear the DTCs (LandCruiser RM000000PDK1DJX.html).

  1. Turn the ignition switch off.

  1. Turn the ignition switch to ON.

  1. Fully release the accelerator pedal for 3 seconds or more, then depress it partway for 3 seconds or more, and then fully depress it for 3 seconds or more.

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

  1. Confirm that the DTC is not output again.


NEXT

END