Lexus IS250 IS220d GSE20 ALE20 2AD-FHV ENGINE CONTROL SYSTEM
READ VALUE OF INTELLIGENT TESTER (ACCELERATOR PEDAL POSITION SENSOR VALUE)
CHECK HARNESS AND CONNECTOR (ACCELERATOR PEDAL POSITION SENSOR - ECM)
DTC P2121 Throttle / Pedal Position Sensor / Switch "D" Circuit Range / Performance
DESCRIPTION
- HINT:
The accelerator pedal position sensor is mounted on the accelerator pedal and detects the opening angle of the accelerator pedal. Since this sensor is electronically controlled with Hall-effect elements, accurate control and reliability can be obtained. It has 2 sensors to detect both 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 malfunctions. The ECM determines the current opening angle of the accelerator pedal using signals from terminals VPA and VPA2, and the ECM controls the throttle motor based on these signals.
| DTC No. | DTC Detection Condition | Trouble Area |
| P2121 | Condition (a) continues for 2 seconds: (a) Difference between VPA1 and VPA2 exceeds the threshold (1 trip detection logic) |
Accelerator pedal position sensor circuit Accelerator pedal position sensor ECM |
WIRING DIAGRAM
INSPECTION PROCEDURE
- NOTICE:
- After replacing the ECM, the new ECM needs registration and initialization .
| 1.READ VALUE OF INTELLIGENT TESTER (ACCELERATOR PEDAL POSITION SENSOR VALUE) |
Connect the intelligent tester to the DLC3.
Turn the engine switch ON (IG) and turn the intelligent tester ON.
Enter the following menus: Powertrain / Engine / Data List / Accel Position 1 and Accel Position 2.
Read the values.
- Standard voltage:
Accelerator Pedal Accel Position 1 Accel Position 2 Released 0.5 to 1.1 V 0.9 to 2.3 V Depressed 3.0 to 4.6 V 3.4 to 5.0 V
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| NG | |
| 2.CHECK HARNESS AND CONNECTOR (ACCELERATOR PEDAL POSITION SENSOR - ECM) |
Disconnect the A26 sensor connector.
Disconnect the A49 ECM connector.
Measure the resistance of the wire harness side connectors.
- Standard resistance:
Tester Connection Specified Condition VCP2 (A26-1) - VCP2 (A49-56) Below 1 Ω EPA2 (A26-2) - EPA2 (A49-58) Below 1 Ω VPA2 (A26-3) - VPA2 (A49-54) Below 1 Ω VCPA (A26-4) - VCPA (A49-55) Below 1 Ω EPA (A26-5) - EPA (A49-57) Below 1 Ω VPA (A26-6) - VPA (A49-53) Below 1 Ω VCP2 (A26-1) or VCP2 (A49-56) - Body ground 10 kΩ or higher EPA2 (A26-2) or EPA2 (A49-58) - Body ground 10 kΩ or higher VPA2 (A26-3) or VPA2 (A49-54) - Body ground 10 kΩ or higher VCPA (A26-4) or VCPA (A49-55) - Body ground 10 kΩ or higher EPA (A26-5) or EPA (A49-57) - Body ground 10 kΩ or higher VPA (A26-6) or VPA (A49-53) - Body ground 10 kΩ or higher
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| OK | ||
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