CHECK FOR ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2121)
READ VALUE USING GTS (ACCELERATOR PEDAL POSITION SENSOR)
REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY
CHECK WHETHER DTC OUTPUT RECURS (DTC P2121)
DTC P2121 Throttle / Pedal Position Sensor / Switch "D" Circuit Range / Performance |
DESCRIPTION
- HINT:
- Refer to DTC P2120 (LandCruiser RM000000PFY0WZX_01.html).
| DTC No. | DTC Detection Condition | Trouble Area |
| P2121 | Either of following conditions 1 or 2 met for 0.5 seconds (1 trip detection logic)
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MONITOR DESCRIPTION
The accelerator pedal position sensor is mounted on the accelerator pedal bracket. The accelerator pedal position sensor has 2 sensor elements and 2 signal outputs: VPA and VPA2. VPA is used to detect the actual accelerator pedal angle (used for engine control) and VPA2 is used to detect malfunctions in VPA.When the difference between the voltage outputs of VPA and VPA2 deviates from the standard, the ECM determines that the accelerator pedal position sensor is malfunctioning. The ECM turns on the MIL and the DTC is stored.
MONITOR STRATEGY
| Required Sensors/Components | Accelerator pedal position sensor |
| Frequency of Operation | Continuous |
CONFIRMATION DRIVING PATTERN
- Connect the GTS to the DLC3.
- Turn the ignition switch to ON and turn the GTS on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC operation).
- Turn the ignition switch off and wait for at least 30 seconds.
- Turn the ignition switch to ON and turn the GTS on [A].
- Wait for 5 seconds after turning the ignition switch to ON.
- Operate the accelerator pedal in accordance with the following procedure [B].
- Enter the following menus: Powertrain / Engine and ECT / Data List / Accel Sens. No. 1 Volt %, and Accel Sens. No.2 Volt %.
- Slowly depress the accelerator pedal until Accel Sens. No.1 Volt % is approximately 30% and Accel Sens. No.2 Volt % is approximately 46%, and then slowly release the accelerator pedal.
- Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [C].
- Read the pending DTCs.
- HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
- Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
- Input the DTC: P2121.
- Check the DTC judgment result.
GTS Display Description NORMAL - DTC judgment completed
- System normal
ABNORMAL - DTC judgment completed
- System abnormal
INCOMPLETE - DTC judgment not completed
- Perform driving pattern after confirming DTC enabling conditions
N/A - Unable to perform DTC judgment
- Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
- HINT:
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows INCOMPLETE or N/A, perform steps [B] through [C] again.
- DTC judgment completed
FAIL-SAFE
The accelerator pedal position sensor has 2 sensor circuits: Main and Sub.If either circuit malfunctions, the ECM limits the engine output.
If both circuits malfunction, the ECM regards the accelerator pedal as being released. As a result, the throttle valve is closed and the engine idles.
WIRING DIAGRAM
Refer to DTC P2120 (LandCruiser RM000000PFY0WZX_08.html).INSPECTION PROCEDURE
- HINT:
- This DTC relates to the accelerator pedal position sensor.
- 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, 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 GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
Read the DTCs.
Result Result Proceed to P2121 is output A P2121 and other DTCs are output B - HINT:
- If any DTCs other than P2121 are output, troubleshoot those DTCs first.
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| A | |
| 2.READ VALUE USING GTS (ACCELERATOR PEDAL POSITION SENSOR) |
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Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS 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 GTS.
- 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 4.75 V
Text in Illustration *a Depressed *b Released
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| OK | ||
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| 3.REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY |
Replace the accelerator pedal sensor assembly (LandCruiser RM00000111V00GX.html).
| NEXT | |
| 4.CHECK WHETHER DTC OUTPUT RECURS (DTC P2121) |
Connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the tester on.
Clear the DTCs (LandCruiser RM000000VNG00DX.html).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch to ON.
Wait for 5 seconds after turning the ignition switch to ON.
Enter the following menus: Powertrain / Engine / Data List / Accel Sens. No. 1 Volt %, and Accel Sens. No. 2 Volt %.
Slowly depress the accelerator pedal until Accel Sens. No. 1 Volt % is approximately 30% and Accel Sens. No. 2 Volt % is approximately 46%, then slowly release the accelerator pedal.
Read the DTCs.
Result Result Proceed to P2121 is output A No DTC is output B
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| A | ||
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