2Tr-Fbe Engine Control. Dtc P2121 Throttle / Pedal Position Sensor / Switch D Circuit Range / Performance

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. Difference between VPA and VPA2 is greater than or equal to the specified value.

Accelerator pedal sensor assembly

FAIL-SAFE

The accelerator pedal position sensor has two (main and sub) sensor circuits. If a malfunction occurs in either of the sensor circuits, the ECM detects the abnormal signal voltage difference between the two sensor circuits and switches to limp mode. In limp mode, the functioning circuit is used to calculate the accelerator pedal position to allow the vehicle to continue driving. If both circuits malfunction, the ECM regards the accelerator pedal as being fully 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 (HILUX_TGN26 RM000000PFY0REX_08.html).

INSPECTION PROCEDURE

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, 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)

Connect the intelligent tester to the DLC3.

Turn the ignition switch to ON.

Turn the tester on.

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

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

Result
Result	Proceed to
DTC P2121 is output	A
DTC P2121 and other DTCs are output	B

GO TO DTC CHART (HILUX_TGN26 RM000000PDF0H4X.html)

A

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

Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.2Tr-Fbe Engine Control.Sfi System.
Dtc
P2121 Throttle / Pedal Position Sensor / Switch D Circuit Range / Performance

Connect the intelligent tester to the DLC3.

Turn the ignition switch to ON.

Turn the tester on.

Enter the following menus: Powertrain / Engine and ECT / Data List / Accel Sensor Out No.1 and Accel Sensor Out No.2.

Read the values displayed on the tester.
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 4.98 V

Go to step 3

CHECK FOR INTERMITTENT PROBLEMS (HILUX_TGN26 RM000000PDQ0YMX.html)

3.REPLACE ACCELERATOR PEDAL ROD ASSEMBLY

Replace the Accelerator pedal rod assembly (HILUX_TGN26 RM000000VWD01YX.html).

NEXT

4.CHECK WHETHER DTC OUTPUT RECURS (DTC P2121)

Connect the intelligent tester to the DLC3.

Turn the ignition switch to ON.

Turn the tester on.

Clear the DTCs (HILUX_TGN26 RM000000PDK12LX.html).

Start the engine.

Allow the engine to idle for 15 seconds.

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

Read the DTCs.
Result
Result
Proceed to
DTC P2121 is output
A
DTC is not output
B

Result
Result	Proceed to
DTC P2121 is output	A
DTC is not output	B

END

REPLACE ECM (HILUX_TGN26 RM000000VW2024X.html)

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 4.98 V