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

Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - 1VD-FTV ENGINE CONTROL

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING GTS (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 ().

P2121
DTC Detection Drive PatternDTC Detection ConditionTrouble Area
Engine switch on (IG)
Accelerator pedal fully released for 3 seconds
Accelerator pedal depressed partway for 3 seconds
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).
Accelerator pedal position sensor circuit
Accelerator pedal position sensor
ECM
Related Data List
DTC No.Data List
P2121
Accel Position
Accel Sens. No.1 Volt %
Accel Sens. No.2 Volt %

WIRING DIAGRAM

Refer to DTC P2120 ().


INSPECTION PROCEDURE

  • NOTICE:
After replacing the ECM, the new ECM needs registration () and initialization ().
After replacing the fuel supply pump assembly, the ECM needs initialization ().
After replacing an injector assembly, the ECM needs registration ().
  • HINT:
  • 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, and other data from the time the malfunction occurred.
1.READ VALUE USING GTS (ACCELERATOR PEDAL POSITION SENSOR)
Dtc P2121 Throttle / Pedal Position Sensor / Switch D Circuit Range / Performance. 1VD-FTV ENGINE CONTROL. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Connect the GTS to the DLC3.

Turn the engine switch on (IG) and turn the GTS on.

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

Read the values.

  • Standard:
  • Accelerator PedalAccel Sens. No.1 Volt %Accel Sens. No.2 Volt %
    Released10 to 22%24 to 40%
    Depressed52 to 90%68 to 99%
Text in Illustration
*1Accelerator Pedal Assembly
*aDepressed
*bReleased
Result
ResultProceed to
NGA
OKB
B
Go to step 7
A
2.CHECK HARNESS AND CONNECTOR (ACCELERATOR PEDAL POSITION SENSOR - ECM)

Disconnect the accelerator pedal position sensor connector.

Disconnect the ECM connector.

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

  • Standard Resistance:
  • for LHD
    Tester ConnectionConditionSpecified Condition
    A31-1 (VCP2) - A38-56 (VCP2)AlwaysBelow 1 Ω
    A31-2 (EPA2) - A38-58 (EPA2)AlwaysBelow 1 Ω
    A31-3 (VPA2) - A38-54 (VPA2)AlwaysBelow 1 Ω
    A31-4 (VCPA) - A38-55 (VCPA)AlwaysBelow 1 Ω
    A31-5 (EPA) - A38-57 (EPA)AlwaysBelow 1 Ω
    A31-6 (VPA) - A38-53 (VPA)AlwaysBelow 1 Ω
    A31-1 (VCP2) or A38-56 (VCP2) - Body groundAlways10 kΩ or higher
    A31-2 (EPA2) or A38-58 (EPA2) - Body groundAlways10 kΩ or higher
    A31-3 (VPA2) or A38-54 (VPA2) - Body groundAlways10 kΩ or higher
    A31-4 (VCPA) or A38-55 (VCPA) - Body groundAlways10 kΩ or higher
    A31-5 (EPA) or A38-57 (EPA) - Body groundAlways10 kΩ or higher
    A31-6 (VPA) or A38-53 (VPA) - Body groundAlways10 kΩ or higher
  • Standard Resistance:
  • for RHD
    Tester ConnectionConditionSpecified Condition
    A31-1 (VCP2) - A52-56 (VCP2)AlwaysBelow 1 Ω
    A31-2 (EPA2) - A52-58 (EPA2)AlwaysBelow 1 Ω
    A31-3 (VPA2) - A52-54 (VPA2)AlwaysBelow 1 Ω
    A31-4 (VCPA) - A52-55 (VCPA)AlwaysBelow 1 Ω
    A31-5 (EPA) - A52-57 (EPA)AlwaysBelow 1 Ω
    A31-6 (VPA) - A52-53 (VPA)AlwaysBelow 1 Ω
    A31-1 (VCP2) or A52-56 (VCP2) - Body groundAlways10 kΩ or higher
    A31-2 (EPA2) or A52-58 (EPA2) - Body groundAlways10 kΩ or higher
    A31-3 (VPA2) or A52-54 (VPA2) - Body groundAlways10 kΩ or higher
    A31-4 (VCPA) or A52-55 (VCPA) - Body groundAlways10 kΩ or higher
    A31-5 (EPA) or A52-57 (EPA) - Body groundAlways10 kΩ or higher
    A31-6 (VPA) or A52-53 (VPA) - Body groundAlways10 kΩ or higher

Reconnect the accelerator pedal position sensor connector.

Reconnect the ECM connector.

NG
Go to step 6
OK
3.REPLACE ACCELERATOR PEDAL ROD ASSEMBLY

Replace the accelerator pedal rod assembly ().

NEXT
4.CHECK WHETHER DTC OUTPUT RECURS (DTC P2121)

Connect the GTS to the DLC3.

Clear the DTCs ().

Turn the engine switch on (IG).

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.

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

Read the DTCs.

Result
ResultProceed to
P2121 is outputA
No DTC is outputB
B
END
A
5.REPLACE ECM

Replace the ECM ().

NEXT
Go to step 7
6.REPAIR OR REPLACE HARNESS OR CONNECTOR

Repair or replace the harness or connector.

NEXT
7.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

Connect the GTS to the DLC3.

Clear the DTCs ().

Turn the engine switch off.

Turn the engine switch on (IG).

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.

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

Confirm that the DTC is not output again.

NEXT
END