Dtc P1120 Throttle / Pedal Position Sensor/Coolant Flow Control Valve Position Sensor Circuit
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
READ VALUE USING GTS (ACCELERATOR POSITION)
READ OUTPUT DTC (ACCELERATOR PEDAL POSITION SENSOR DTC IS OUTPUT AGAIN)
CHECK HARNESS AND CONNECTOR (ECM - ACCELERATOR PEDAL POSITION SENSOR)
INSPECT ECM (VCPA AND VCP2 VOLTAGE)
REPLACE ACCELERATOR PEDAL ROD ASSEMBLY
READ OUTPUT DTC (ACCELERATOR PEDAL POSITION SENSOR DTC IS OUTPUT AGAIN)
DTC P1120 Throttle / Pedal Position Sensor/Coolant Flow Control Valve Position Sensor Circuit |
DESCRIPTION
- HINT:
- This is the repair procedure for the accelerator pedal position sensor.
- The electrical throttle system does not use a throttle cable.
- The accelerator pedal position sensor is a non-contact type.
The accelerator pedal position sensor is mounted in the accelerator pedal to detect the opening angle of the accelerator pedal. Since this sensor is electronically controlled with hall elements, accurate control and reliability can be obtained. It has 2 sensors to detect the accelerator position and a malfunction of the accelerator position sensor.In the accelerator pedal position sensor, the voltage applied to pedal terminals VPA and VPA2 of the ECM changes between 0 V and 5 V, in proportion to the opening angle of the accelerator pedal. The VPA is a signal to indicate the actual accelerator pedal opening angle which is used for the engine control, and the VPA2 is a signal to indicate the information about the opening angle which is used for detecting a malfunction. The ECM judges the current opening angle of the accelerator pedal from these signals input from terminals VPA and VPA2, and the ECM controls the injection pump based on these signals.
DTC No.
| DTC Detection Condition
| Trouble Area
|
P1120
| Condition (a), (b), (c) or (d) continues for 2.0 seconds:
(a) VPA is 0.2 V or less and VPA2 is 0.5 V or less.
(b) VPA is 4.8 V or higher.
(c) VPA2 is 4.8 V or higher, and VPA is between 0.4 V and 3.45 V.
(d) The difference between VPA and VPA2 is 0.02 V or less.
| - Open or short in accelerator pedal position sensor circuit
- Accelerator pedal rod assembly
- ECM
|
Condition (a) continues for 0.5 seconds:
(a) VPA is 0.2 V or less or VPA2 is 0.5 V or less.
|
WIRING DIAGRAM
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) |
Connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Data List / Accel Sens. No.1 Volt % and Accel Sens. No.2 Volt %.
Read the values.
- OK:
- Check that the value displayed on the GTS changes by repeatedly depressing and releasing the accelerator pedal.
| 2.READ OUTPUT DTC (ACCELERATOR PEDAL POSITION SENSOR DTC IS OUTPUT AGAIN) |
Clear the DTC (LandCruiser RM000000VR600WX.html).
Start the engine.
Idle the engine for 15 seconds or more.
Read the DTC (LandCruiser RM000000VR600WX.html).
- Result:
Display (DTC output)
| Proceed to
|
DTC P1120 is output again
| A
|
No DTC output
| B
|
| 3.CHECK HARNESS AND CONNECTOR (ECM - ACCELERATOR PEDAL POSITION SENSOR) |
Disconnect the accelerator pedal 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
|
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
|
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 4.INSPECT ECM (VCPA AND VCP2 VOLTAGE) |
Disconnect the accelerator pedal position sensor connector.
Turn the ignition switch to ON.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
Tester Connection
| Switch Condition
| Specified Condition
|
A19-1 (VCP2) - A19-2 (EPA2)
| Ignition switch ON
| 4.5 to 5.5 V
|
A19-4 (VCPA) - A19-5 (EPA)
| Ignition switch ON
| 4.5 to 5.5 V
|
Text in Illustration*a
| Front view of wire harness connector
(to Accelerator Pedal Position Sensor)
|
| 5.REPLACE ACCELERATOR PEDAL ROD ASSEMBLY |
Replace the accelerator pedal rod assembly (LandCruiser RM00000463000AX.html).
| 6.READ OUTPUT DTC (ACCELERATOR PEDAL POSITION SENSOR DTC IS OUTPUT AGAIN) |
Clear the DTC (LandCruiser RM000000VR600WX.html).
Start the engine.
Idle the engine for 15 seconds or more.
Read the DTC (LandCruiser RM000000VR600WX.html).
- Result:
Display (DTC output)
| Proceed to
|
DTC P1120 is output again
| A
|
No DTC output
| B
|
