DTC P0120 Throttle/Pedal Position Sensor/Switch A Circuit Malfunction
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- Alisha Golden
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1 DI36 EINE (5VZFE) DI1LH14 DTC P0120 Throttle/Pedal Position Sensor/Switch A Circuit Malfunction CIRCUIT DESCRIPTI Throttle position sensor is mounted on the throttle body and it have the 2 sensors to detect the throttle opening angle and the malfunction of the throttle position sensor s own. The voltage applied to the terminals and 2 of the ECM changes between and 5 V in proportion to the opening angle of the throttle valve. The ECM judges the current opening angle of the throttle valve from these signals input from terminals and 2, and the ECM controls the throttle motor to make the throttle valve angle properly in response to driving condition. If this DTC is stored, the ECM shuts down the power for the throttle motor and the electromagnetic 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 Accelerator pedal Movable Range 2 5 * 1 : * 1 released (15 ) Usable Range : Accelerator pedal depressed (about 100 ) Throttle Position Sensor Output (V) *1 Usable Range Throttle Valve Opening Angle (deg) A02624 DTC No. DTC Detecting Condition Trouble Area P0120 Condition (a), (b), (c), (d) or (e) continues for 2.0 seconds: (a) 0.2 V (b) V (c) 4.8 V (d) When 0.2 V and 2., and V (e) V, or V Open or short in throttle position sensor circuit Throttle position sensor ECM Condition (a) continues for 0.4 seconds: (a) 0.2 V and V HINT: After confirming DTC P0120, use the OBD II scan tool or TOYOTA handheld tester to confirm the throttle valve opening percentage and closed throttle position switch condition. Throttle valve opening position expressed as percentage and voltage Accelerator pedal released Accelerator pedal depressed Trouble area THROTTLE POS THROTTLE POS #2 THROTTLE POS THROTTLE POS #2 circuit open V V circuit open or ground short % 2 circuit open or ground short 10 5 V 10 5 V circuit open 212
2 EINE (5VZFE) DI37 WIRI DIAGRAM T2 Throttle Position Sensor ECM BY GB GY LB 15 E9 25 E9 4 E E9 E1 A03843 INSPECTI PROCEDURE HINT: If DTCs P0110, P0115, P0120, P0450 and P1120 are output simultaneously, (sensor ground) may be open. Read freeze frame data using TOYOTA handheld tester or OBD II scan tool. Because freeze frame records the engine conditions when the malfunction is detected. When troubleshooting it 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 throttle valve opening percentage. (a) Connect the TOYOTA handheld tester to DLC3. (b) Turn the ignition switch and push the TOYOTA handheld tester main switch. Read the throttle valve opening percentage for the circuit and read the voltage for the 2 circuit. FI7052 Accelerator pedal Throttle valve opening position expressed (2) as percentage () Released V Depressed % V Check and replace ECM (See page IN28 ). 213
3 DI38 EINE (5VZFE) 2 Check voltage between terminals and of ECM connector. () (+) Measure the voltage between terminals and of the ECM connector. : V A15301 Check and replace ECM (See page IN28 ). 3 Check voltage between terminals and, and 2 and of ECM connector. 2 (+) () A15302 Measure the voltage between terminals and, and 2 and of the ECM connector. Accelerator l t pedal 2 Released V Depressed V V Check and replace ECM (See page IN28 ). 4 Check throttle position sensor (See page SF30 ). Replace throttle position sensor (See page SF32 ). 214
4 EINE (5VZFE) DI39 Check for open and short in harness and connector in,, 2 and circuits between ECM and throttle position sensor (See page IN28 ). OBD II scan tool (excluding TOYOTA handheld tester): 1 Check voltage between terminals and of ECM connector. () (+) Measure the voltage between terminals and of the ECM connector. : V A15301 Check and replace ECM (See page IN28 ). 2 Check voltage between terminals and, and 2 and of ECM connector. 2 (+) () A15302 Measure the voltage between terminals and, and 2 and of the ECM connector. Accelerator l t pedal 2 Released V Depressed V V Check and replace ECM (See page IN28 ). 215
5 DI40 EINE (5VZFE) 3 Check throttle position sensor (See page SF30 ). Replace throttle position sensor (See page SF32 ). Check for open and short in harness and connector in,, 2 and circuits between ECM and throttle position sensor (See page IN28 ). 216
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