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


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING INTELLIGENT TESTER (ACCELERATOR POSITION NO. 1, ACCELERATOR POSITION NO. 2)

CHECK WIRE HARNESS (ACCELERATOR PEDAL POSITION SENSOR - ECM)

REPLACE ACCELERATOR PEDAL ROD ASSEMBLY

CHECK WHETHER DTC OUTPUT RECURS (ACCELERATOR PEDAL POSITION SENSOR DTCS)

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


DESCRIPTION

HINT:
  1. These DTCs are related to the accelerator pedal position sensor. The troubleshooting procedures for the accelerator pedal position sensor are in the flowchart below.
  2. Refer to DTC P2120 (Toyota Fortuner RM000000PFY0J0X_01.html).

DTC No.
DTC Detection Condition
Trouble Area
P2121
Conditions (a) and (b) continue for 0.5 seconds:
(a) Difference between VPA1 and VPA2 exceeds the threshold
(b) IDL is OFF
  1. Accelerator pedal position sensor circuit
  2. Accelerator pedal position sensor
  3. ECM

WIRING DIAGRAM

Refer to DTC P2120 (Toyota Fortuner RM000000PFY0J0X_08.html).

INSPECTION PROCEDURE

HINT:
Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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.READ VALUE USING INTELLIGENT TESTER (ACCELERATOR POSITION NO. 1, ACCELERATOR POSITION NO. 2)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Gr-Fe Engine Control System.Sfi 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 ON and turn the tester ON.

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / Accelerator Position No. 1 and Accelerator Position No. 2.

  1. Read the value.

    Standard voltage:
    Accelerator Pedal
    		No. 1 Accelerator Position
    		No. 2 Accelerator Position
    Released
    		0.5 to 1.1 V
    		1.2 to 2.0 V
    Depressed
    		2.6 to 4.5 V
    		3.4 to 5.0 V


OK
Go to step 3
NG


2.CHECK WIRE HARNESS (ACCELERATOR PEDAL POSITION SENSOR - ECM)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Gr-Fe Engine Control System.Sfi System. Dtc P2121 Throttle / Pedal Position Sensor / Switch D Circuit Range / Performance

  1. Disconnect the A22 accelerator pedal position sensor connector.

  1. Disconnect the E14 ECM connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    A22-6 (VPA) - E14-18 (VPA)
    		Below 1 Ω
    A22-5 (EPA) - E14-20 (EPA)
    		Below 1 Ω
    A22-4 (VCPA) - E14-26 (VCPA)
    		Below 1 Ω
    A22-3 (VPA2) - E14-19 (VPA2)
    		Below 1 Ω
    A22 (EPA2) - E14-21 (EPA2)
    		Below 1 Ω
    A22-1 (VCP2) - E14-27 (VCP2)
    		Below 1 Ω
    A22-6 (VPA) or E14-18 (VPA) - Body ground
    		10 kΩ or higher
    A22-5 (EPA) or E14-20 (EPA) - Body ground
    		10 kΩ or higher
    A22-4 (VCPA) or E14-26 (VCPA) - Body ground
    		10 kΩ or higher
    A22-3 (VPA2) or E14-19 (VPA2) - Body ground
    		10 kΩ or higher
    A22-2 (EPA2) or E14-21 (EPA2) - Body ground
    		10 kΩ or higher
    A22-1 (VCP2) or E14-27 (VCP2) - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


3.REPLACE ACCELERATOR PEDAL ROD ASSEMBLY

NEXT


4.CHECK WHETHER DTC OUTPUT RECURS (ACCELERATOR PEDAL POSITION SENSOR DTCS)

  1. Connect the intelligent tester to the DLC3.

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

  1. Clear DTCs (Toyota Fortuner RM0000010E700JX.html).

  1. Start the engine.

  1. Allow the engine to idle for 15 seconds.

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

  1. Read DTCs.

    Result:
    Display (DTC Output)
    		Proceed to
    P2121
    		A
    No output
    		B


B
SYSTEM OK
A

REPLACE ECM