1Kd-Ftv Engine Control. Dtc P0122 Throttle / Pedal Position Sensor / Switch A Circuit Low Input

Engine Hybrid System. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25

1Kd-Ftv Engine Control. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25

DESCRIPTION

MONITOR DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)

CHECK ECM TERMINAL VOLTAGE (VC TERMINAL)

REPLACE DIESEL THROTTLE BODY ASSEMBLY

READ VALUE USING INTELLIGENT TESTER

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

DTC P0122 Throttle / Pedal Position Sensor / Switch "A" Circuit Low Input

DTC P0123 Throttle / Pedal Position Sensor / Switch "A" Circuit High Input

DESCRIPTION

The throttle position sensor is mounted on the diesel throttle body assembly and detects the opening angle of the throttle valve. This sensor is an electronic sensor and uses Hall-effect elements.
When the throttle valve is fully closed, a voltage of approximately 0.7 V is applied to terminal VLU of the ECM. The voltage applied to terminal VLU of the ECM increases in proportion to the opening angle of the throttle valve and becomes approximately 3.5 to 4.0 V when the throttle valve is fully opened.
The ECM determines the vehicle driving conditions from the signals input to its VLU terminal. The data is one of the pieces of information used for EGR control, etc.

Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.1Kd-Ftv Engine Control.Ecd System (For Dpf).
Dtc
P0122 Throttle / Pedal Position Sensor / Switch A Circuit Low Input

P0122
DTC Detection Drive Pattern	DTC Detection Condition	Trouble Area
Ignition switch to ON for 3 seconds	Throttle position sensor output (VLU) is below 0.2 V for 3 seconds (1 trip detection logic).	Throttle position sensor Open or short in VLU circuit Open in VC circuit ECM

P0123
DTC Detection Drive Pattern	DTC Detection Condition	Trouble Area
Ignition switch to ON for 3 seconds	Throttle position sensor output (VLU) is higher than 4.8 V for 3 seconds (1 trip detection logic).	Throttle position sensor Open in E2 circuit VC and VLU circuits are short-circuited ECM

HINT:

If DTC P0122 and/or P0123 is stored, the following symptoms may appear:

- Intake booming noise
- Black smoke
- Lack of power
- Vibration at engine stop
- Turbo overspeed, turbo damage

MONITOR DESCRIPTION

When the output voltage of the throttle position sensor deviates from the normal operating range (between 0.2 V and 4.8 V) for more than 3 seconds, the ECM interprets this as a malfunction of the sensor circuit and illuminates the MIL.

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

After replacing the ECM, the new ECM needs registration (HILUX_TGN26 RM0000012XK05BX.html) and initialization (HILUX_TGN26 RM000000TIN04CX.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.CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)

Disconnect the throttle position sensor connector.

Disconnect the ECM connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
C9-1 (VC) - C22-18 (VC)	Always	Below 1 Ω
C9-3 (VTA) - C23-29 (VLU)	Always	Below 1 Ω
C9-2 (E2) - C22-28 (E2)	Always	Below 1 Ω
C9-1 (VC) or C22-18 (VC) - Body ground	Always	10 kΩ or higher
C9-3 (VTA) or C23-29 (VLU) - Body ground	Always	10 kΩ or higher
C9-2 (E2) or C22-28 (E2) - Body ground	Always	10 kΩ or higher

Reconnect the throttle position sensor connector.

Reconnect the ECM connector.

Go to step 6

OK

2.CHECK ECM TERMINAL VOLTAGE (VC TERMINAL)

Disconnect the throttle position sensor connector.

Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
Switch Condition
Specified Condition
C9-1 (VC) - C9-2 (E2)
Ignition switch ON
4.5 to 5.5 V
Text in Illustration
*a
Front view of wire harness connector
(to Throttle Position Sensor)

Text in Illustration
*a	Front view of wire harness connector (to Throttle Position Sensor)

Reconnect the throttle position sensor connector.

Go to step 5

OK

3.REPLACE DIESEL THROTTLE BODY ASSEMBLY

Replace the diesel throttle body assembly (HILUX_TGN26 RM0000013ZD01FX.html).

NEXT

4.READ VALUE USING INTELLIGENT TESTER

Connect the intelligent tester to the DLC3.

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

Clear the DTCs (HILUX_TGN26 RM000000PDK0XBX.html).

Enter the following menus: Powertrain / Engine and ECT / Data List / Actual Throttle position.

Check the movement of the throttle valve when idling the engine after starting it from ignition switch to ON.
OK
Condition
Tester Display
Ignition switch ON
-5 to 5%
Idling
0 to 90%

OK
Condition	Tester Display
Ignition switch ON	-5 to 5%
Idling	0 to 90%

Go to step 5

END

5.REPLACE ECM

Replace the ECM (HILUX_TGN26 RM0000013Z001IX.html).

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 intelligent tester to the DLC3.

Clear the DTCs (HILUX_TGN26 RM000000PDK0XBX.html).

Turn the ignition switch off and wait for 30 seconds or more.

Turn the ignition switch to ON for 3 seconds.

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

Confirm that the DTC is not output again.

END

Tester Connection	Switch Condition	Specified Condition
C9-1 (VC) - C9-2 (E2)	Ignition switch ON	4.5 to 5.5 V