Dtc P1121 Throttle / Pedal Position Sensor/Coolant Flow Control Valve Position Sensor Circuit Stuck


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING GTS (ACCELERATOR POSITION)

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

DTC P1121 Throttle / Pedal Position Sensor/Coolant Flow Control Valve Position Sensor Circuit Stuck


DESCRIPTION

Refer to DTC P1120 (LandCruiser RM000000VQY008X_02.html)

DTC No.
DTC Detection Condition
Trouble Area
P1121
Either of the ECM sensors have completed learning and the electric potential difference of VPA and VPA2 sensors has become more than 1.2 V or less than 0.4 V.
  1. Open or short in accelerator pedal position sensor circuit
  2. Accelerator pedal position sensor
  3. ECM
One of the following continues more than 2.0 seconds.
  1. When the electrical potential difference of VPA and VPA2 sensors is not within the specified range.
  2. VPA2 is 4.9 V or higher.
  3. Accelerator idling criterion voltage of VPA and VPA2 is less than 0.04 V.

WIRING DIAGRAM

Refer to DTC P1120 (LandCruiser RM000000VQY008X_03.html)

INSPECTION PROCEDURE

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 POSITION)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.5L-E Engine Control.Ecd System. Dtc P1121 Throttle / Pedal Position Sensor/Coolant Flow Control Valve Position Sensor Circuit Stuck

  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 Sens. No.1 Volt % and Accel Sens. No.2 Volt %.

  1. Read the values.

    OK:
    Check that the value displayed on the GTS changes by repeatedly depressing and releasing the accelerator pedal.


NG
Go to step 2
OK

REPLACE ECM (LandCruiser RM000000VW203FX.html)

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

  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:

    Tester Connection
    		Condition
    		Specified Condition
    A19-1 (VCP2) - G183-23 (VCP2)
    		Always
    		Below 1 Ω
    A19-2 (EPA2) - G183-29 (EPA2)
    		Always
    		Below 1 Ω
    A19-3 (VPA2) - G183-28 (VPA2)
    		Always
    		Below 1 Ω
    A19-4 (VCPA) - G183-26 (VCPA)
    		Always
    		Below 1 Ω
    A19-5 (EPA) - G183-27 (EPA)
    		Always
    		Below 1 Ω
    A19-6 (VPA) - G183-20 (VPA)
    		Always
    		Below 1 Ω
    A19-1 (VCP2) or G183-23 (VCP2) - Body ground
    		Always
    		10 kΩ or higher
    A19-2 (EPA2) or G183-29 (EPA2) - Body ground
    		Always
    		10 kΩ or higher
    A19-3 (VPA2) or G183-28 (VPA2) - Body ground
    		Always
    		10 kΩ or higher
    A19-4 (VCPA) or G183-26 (VCPA) - Body ground
    		Always
    		10 kΩ or higher
    A19-5 (EPA) or G183-27 (EPA) - Body ground
    		Always
    		10 kΩ or higher
    A19-6 (VPA) or G183-20 (VPA) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ACCELERATOR PEDAL ROD ASSEMBLY (LandCruiser RM00000463000AX.html)