READ VALUE USING GTS (ACCELERATOR POSITION SENSOR)
CHECK HARNESS AND CONNECTOR (ACCELERATOR PEDAL POSITION SENSOR - ECM)
REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY
CHECK WHETHER DTC OUTPUT RECURS (ACCELERATOR PEDAL SENSOR DTCS)
DTC P2121 Throttle / Pedal Position Sensor / Switch "D" Circuit Range / Performance |
DESCRIPTION
Refer to DTC P2120 (LandCruiser RM000000PFY0WTX_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):
|
|
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 output voltages 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.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 accelerator pedal as being fully released. In this case, the throttle valve remains closed as if the engine is idling.If a pass condition is detected and then the engine switch is turned off, the fail-safe operation stops and the system returns to normal.
WIRING DIAGRAM
Refer to DTC P2120 (LandCruiser RM000000PFY0WTX_08.html).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, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.
- This DTC relates to the accelerator pedal position sensor.
| 1.READ VALUE USING GTS (ACCELERATOR POSITION SENSOR) |
 |
Connect the GTS to the DLC3.
Turn the engine switch on (IG) and turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Data List / Ptrl Throttle / Accel Sensor Out No. 1 and Accel Sensor Out No. 2.
Read the value 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 Result Result Proceed to OK A NG B
|
| ||||
| B | |
| 2.CHECK HARNESS AND CONNECTOR (ACCELERATOR PEDAL POSITION SENSOR - ECM) |
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 (Check for Open):
for Automatic Transmission Tester Connection Condition Specified Condition A19-6 (VPA) - G55-2 (VPA) Always Below 1 Ω A19-5 (EPA) - G55-1 (EPA) Always Below 1 Ω A19-4 (VCPA) - G56-6 (VCPA) Always Below 1 Ω A19-3 (VPA2) - G56-5 (VPA2) Always Below 1 Ω A19-2 (EPA2) - G56-4 (EPA2) Always Below 1 Ω A19-1 (VCP2) - G56-3 (VCP2) Always Below 1 Ω for Manual Transmission Tester Connection Condition Specified Condition A19-6 (VPA) - G56-6 (VPA) Always Below 1 Ω A19-5 (EPA) - G56-3 (EPA) Always Below 1 Ω A19-4 (VCPA) - G56-4 (VCPA) Always Below 1 Ω A19-3 (VPA2) - G56-5 (VPA2) Always Below 1 Ω A19-2 (EPA2) - G56-1 (EPA2) Always Below 1 Ω A19-1 (VCP2) - G56-2 (VCP2) Always Below 1 Ω
- Standard Resistance (Check for Short):
for Automatic Transmission Tester Connection Condition Specified Condition A19-6 (VPA) or G55-2 (VPA) - Body ground Always 10 kΩ or higher A19-5 (EPA) or G55-1 (EPA) - Body ground Always 10 kΩ or higher A19-4 (VCPA) or G56-6 (VCPA) - Body ground Always 10 kΩ or higher A19-3 (VPA2) or G56-5 (VPA2) - Body ground Always 10 kΩ or higher A19-2 (EPA2) or G56-4 (EPA2) - Body ground Always 10 kΩ or higher A19-1 (VCP2) or G56-3 (VCP2) - Body ground Always 10 kΩ or higher for Manual Transmission Tester Connection Condition Specified Condition A19-6 (VPA) or G56-6 (VPA) - Body ground Always 10 kΩ or higher A19-5 (EPA) or G56-3 (EPA) - Body ground Always 10 kΩ or higher A19-4 (VCPA) or G56-4 (VCPA) - Body ground Always 10 kΩ or higher A19-3 (VPA2) or G56-5 (VPA2) - Body ground Always 10 kΩ or higher A19-2 (EPA2) or G56-1 (EPA2) - Body ground Always 10 kΩ or higher A19-1 (VCP2) or G56-2 (VCP2) - Body ground Always 10 kΩ or higher
Reconnect the accelerator pedal position sensor connector.
Reconnect the ECM connector.
|
| ||||
| OK | |
| 3.REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY |
Replace the accelerator pedal sensor assembly (LandCruiser RM0000028B201FX.html).
| NEXT | |
| 4.CHECK WHETHER DTC OUTPUT RECURS (ACCELERATOR PEDAL SENSOR DTCS) |
Connect the GTS to the DLC3.
Turn the engine switch on (IG) and turn the GTS on.
Clear the DTCs (LandCruiser RM000000PDK1DIX.html).
Start the engine.
Allow the engine to idle for 15 seconds.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
Read the DTCs.
Result Result Proceed to P2121 A No output B
|
| ||||
| A | ||
| ||