CHECK FOR ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2121)
READ VALUE USING INTELLIGENT TESTER (ACCELERATOR POSITION SENSOR)
REPLACE ACCELERATOR PEDAL ROD ASSEMBLY
CHECK WHETHER DTC OUTPUT RECURS (DTC P2121)
DTC P2121 Throttle / Pedal Position Sensor / Switch "D" Circuit Range / Performance |
DESCRIPTION
Refer to DTC P2120 (HILUX_TGN26 RM000000PFY0RCX_01.html).| DTC Code | DTC Detection Condition | Trouble Area |
| P2121 | Either conditions (1) or (2) met for 0.5 seconds (1 trip detection logic):
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MONITOR DESCRIPTION
When the difference between the output voltages of VPA and VPA2 deviates from the standard, the ECM determines that the accelerator pedal rod assembly is malfunctioning. The ECM turns on the MIL and stores the DTC.CONFIRMATION DRIVING PATTERN
- Connect the intelligent tester to the DLC3.
- Turn the ignition switch to ON and turn the tester 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 tester 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 / DTC [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.
Tester 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] and [C] again.
- DTC judgment completed
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 opening angle to allow the vehicle to continue to be driven. If both circuits malfunction, the ECM regards the opening angle of the accelerator pedal as being fully closed. 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 a normal condition.
WIRING DIAGRAM
Refer to DTC P2120 (HILUX_TGN26 RM000000PFY0RCX_08.html).INSPECTION PROCEDURE
| 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 and turn the tester on.
Enter the following menus: Powertrain / Engine and ECT / DTC.
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 INTELLIGENT TESTER (ACCELERATOR POSITION SENSOR) |
Connect the intelligent tester to the DLC3.
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Turn the ignition switch to ON and turn the tester on.
Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Accel Sensor Out No. 1 and Accel Sensor Out No. 2.
Read the value 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 4.9 V
Text in Illustration *a Depressed *b Released
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| OK | ||
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| 3.REPLACE ACCELERATOR PEDAL ROD ASSEMBLY |
Replace the accelerator pedal rod assembly (HILUX_TGN26 RM000000VWD02BX.html).
| NEXT | |
| 4.CHECK WHETHER DTC OUTPUT RECURS (DTC P2121) |
Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON and turn the tester on.
Clear the DTCs (HILUX_TGN26 RM000000PDK12JX.html).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch to ON.
Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
Enter the following menus: Powertrain / Engine and ECT / DTC.
Read the DTCs.
Result Result Proceed to P2121 is output A DTC is not output B
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| A | ||
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