DTC P2120 Throttle/Pedal Position Sensor/Switch D Circuit
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- Julius Warner
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1 EINE DI207 DIAFO02 DTC P2120 Throttle/Pedal Position Sensor/Switch D Circuit *: Only for sequential manual transmission vehicle. CIRCUIT DESCRIPTI The accelerator pedal position sensor is mounted on the throttle body and it has the 2 sensors to detects the accelerator position and a malfunction of the accelerator position sensor. The accelerator pedal position sensor, connected with the accelerator pedal by the accelerator wire and the voltage applied to the terminals and 2 of the ECM changes between and in proportion to the opening angle of the accelerator pedal. The ECM judges the current opening angle of the accelerator pedal from these signals input from terminals and 2 and, the ECM controls the throttle motor based on these signals. If this DTC is stored, the ECM shuts down the power for the throttle motor and the magnetic clutch, and the throttle valve is fully closed by the return spring. However, the opening angle of the throttle valve can be controlled by the accelerator pedal through the throttle cable. Movable Range Usable Range A02395 A02396 * 1 * 2 2 Movable Range 2 5 * 1 : Accelerator pedal * 1 released (15 ) Usable Range * 2 : Accelerator pedal depressed (about ) * 2 Accelerator Pedal Position Sensor Output Voltage (V) * 1 * 2 Usable Range Throttle Valve Opening Angle (deg) A02624 DTC No. DTC Detection Condition Trouble Area P2120 Condition (a), (b), (c), (d) or (e) continues for 0.5 seconds: (a) 0.2 V (b) 2 0. (c) 4.7 V (d) When 0.2 V and 1.8 V, and V (e) V, or V Open or short in accelerator pedal position sensor circuit Accelerator pedal position sensor ECM Condition (a) continues for 2.0 seconds: (a) 0.2 V and 2 0. HINT: After confirming DTC P1120, use the OBD II scan tool or the TOYOTA handheld tester to confirm the throttle valve opening percentage. Accelerator pedal position expressed as voltage Accelerator pedal released Accelerator pedal depressed Trouble area ACCEL POS #1 ACCEL POS #2 ACCEL POS #1 ACCEL POS #2 circuit open V V circuit open or ground short V V 2 circuit open or ground short circuit open 384
2 DI208 DIAGNOSTICS EINE WIRI DIAGRAM A18 Accelerator Pedal Position Sensor ECM L LR BL BR E1 A03843 INSPECTI PROCEDURE HINT: If different DTCs that are related to different systems are output simultaneously while terminal is used as a ground terminal, terminal may be open. Read freeze frame data using the handheld tester or the OBD II scan tool, as freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, this is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the airfuel ratio was lean or rich, etc. at the time of the malfunction. TOYOTA handheld tester: 1 Connect TOYOTA handheld tester, and read voltage for accelerator pedal position sensor data. (a) Connect the TOYOTA handheld tester to the DLC3. (b) Turn the ignition switch and push the TOYOTA hand held tester main switch. Read the voltage for the accelerator pedal position sensor data. : FI7052 Accelerator Pedal 2 Released V V Depressed V V 385
3 EINE DI209 2 Check voltage between terminals and of ECM connector. BE6653 A09347 (+) () A12731 (b) Turn the ignition switch. Measure the voltage between terminals and of the ECM connector. : Voltage: Check voltage between terminals and, and 2 and of ECM connector. 2 (b) Turn the ignition switch. Measure the voltage between terminals and, and 2 and of the ECM connector. : (+) () A15361 Voltage Accelerator l t pedal 2 Released V V Depressed V V 386
4 DI210 DIAGNOSTICS EINE 4 Check accelerator pedal position sensor (See page SF36). Replace accelerator pedal position sensor (See page SF42). Check for open and short in harness and connector in,, 2 and circuits between ECM and accelerator pedal position sensor (See page IN28). OBD II scan tool (excluding TOYOTA handheld tester): 1 Check voltage between terminals and of ECM connector. BE6653 A09347 (+) () A12731 (b) Turn the ignition switch. Measure the voltage between terminals and of the ECM connector. : Voltage:
5 EINE DI211 2 Check voltage between terminals and, and 2 and of ECM connector. 2 (b) Turn the ignition switch. Measure the voltage between terminals and, and 2 and of the ECM connector. : (+) () A15361 Voltage Accelerator l t pedal 2 Released V V Depressed V V 3 Check accelerator pedal position sensor (See page SF36). Replace accelerator pedal position sensor (See page SF41). Check for open and short in harness and connector in,, 2 and circuits between ECM and accelerator pedal position sensor (See page IN28). 388
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