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

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 0.4 to 1.0 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 2.8 to 3.8 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.

Land Cruiser. Urj200, 202 Grj200 Vdj200.1Vd-Ftv Engine Control.Ecd System (W/ Dpf).
Dtc
P0122 Throttle / Pedal Position Sensor / Switch A Circuit Low Input

P0122 (Bank 1), P0222 (Bank 2)
DTC Detection Drive Pattern	DTC Detection Condition	Trouble Area
Ignition switch ON for 3 seconds	Throttle position sensor output (VLU, VLU2) is below 0.2 V for 3 seconds. (1 trip detection logic)	Throttle position sensor Open or short in VLU, VLU2 circuit Open in VC circuit ECM

P0123 (Bank 1), P0223 (Bank 2)
DTC Detection Drive Pattern	DTC Detection Condition	Trouble Area
Ignition switch ON for 3 seconds	Throttle position sensor output (VLU, VLU2) is higher than 4.8 V for 3 seconds. (1 trip detection logic)	Throttle position sensor Open in E2 circuit VC and VLU, VLU2 circuits are short-circuited ECM

HINT:

If DTC P0122, P0123, P0222 and/or P0223 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 (Click here) and initialization (Click here).
After replacing the fuel supply pump assembly, the ECM needs initialization (Click here).
After replacing an injector assembly, the ECM needs registration (Click here).

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.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:

for LHD
Tester Connection	Condition	Specified Condition
C83-1 (VC) - C45-110 (VCVL)	Always	Below 1 Ω
C83-3 (VTA) - C45-64 (VLU)	Always	Below 1 Ω
C83-2 (E2) - C45-87 (EVLU)	Always	Below 1 Ω
C84-1 (VC) - C45-110 (VCVL)	Always	Below 1 Ω
C84-3 (VTA2) - C45-65 (VLU2)	Always	Below 1 Ω
C84-2 (E2) - C45-87 (EVLU)	Always	Below 1 Ω
C83-1 (VC) or C45-110 (VCVL) - Body ground	Always	10 kΩ or higher
C83-3 (VTA) or C45-64 (VLU) - Body ground	Always	10 kΩ or higher
C84-1 (VC) or C45-110 (VCVL) - Body ground	Always	10 kΩ or higher
C84-3 (VTA2) or C45-65 (VLU2) - Body ground	Always	10 kΩ or higher

for RHD
Tester Connection	Condition	Specified Condition
C83-1 (VC) - C46-110 (VCVL)	Always	Below 1 Ω
C83-3 (VTA) - C46-64 (VLU)	Always	Below 1 Ω
C83-2 (E2) - C46-87 (EVLU)	Always	Below 1 Ω
C84-1 (VC) - C46-110 (VCVL)	Always	Below 1 Ω
C84-3 (VTA2) - C46-65 (VLU2)	Always	Below 1 Ω
C84-2 (E2) - C46-87 (EVLU)	Always	Below 1 Ω
C83-1 (VC) or C46-110 (VCVL) - Body ground	Always	10 kΩ or higher
C83-3 (VTA) or C46-64 (VLU) - Body ground	Always	10 kΩ or higher
C84-1 (VC) or C46-110 (VCVL) - Body ground	Always	10 kΩ or higher
C84-3 (VTA2) or C46-65 (VLU2) - 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
C83-1 (VC) - C83-2 (E2)
Ignition switch ON
4.5 to 5.5 V
C84-1 (VC) - C84-2 (E2)
Ignition switch ON
4.5 to 5.5 V
Text in Illustration
*A
for Bank 1
*B
for Bank 2
*a
Front view of wire harness connector
(to Throttle Position Sensor)

Text in Illustration
*A	for Bank 1
*B	for Bank 2
*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

When DTC P0122 or P0123 is output:

Replace the diesel throttle body assembly (for bank 1) (Click here).

When DTC P0222 or P0223 is output:

Replace the diesel throttle body assembly (for bank 2) (Click here).

NEXT

4.READ VALUE USING GTS

Connect the GTS to the DLC3.

Turn the ignition switch to ON and turn the GTS on.

Clear the DTCs (Click here).

Enter the following menus: Engine and ECT / Data List / Actual Throttle position, Actual Throttle position #2.

Check the movement of the throttle valve when idling the engine after starting it from ignition switch ON.
OK:
Condition
GTS Display
Ignition switch ON
95 to 105%
Idling
5 to 15%

Go to step 5

END

5.REPLACE ECM

Replace the ECM (Click here).

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 (Click here).

Turn the ignition switch off.

Turn the ignition switch to ON for 3 seconds.

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

Confirm that the DTC is not output again.

END

Tester Connection	Switch Condition	Specified Condition
C83-1 (VC) - C83-2 (E2)	Ignition switch ON	4.5 to 5.5 V
C84-1 (VC) - C84-2 (E2)	Ignition switch ON	4.5 to 5.5 V

Condition	GTS Display
Ignition switch ON	95 to 105%
Idling	5 to 15%