Toyota Tacoma manuals

Toyota Corolla Repair Manual: Circuit description

Refer to dtc p0120

Dtc no.

Dtc detection condition

Trouble area

P0121 The following condition is met 4 times. After the vehicle speed has exceeded 19 mph (30 km/h) once, the throttle position sensor output value is out of normal range when the throttle valve is closed at 0 km/h
  • Throttle position sensor (built in throttle body)

Monitor description

The throttle position sensor varies its resistance with the angle of the throttle valve. The ecm applies a regulated reference voltage to the throttle position sensor + terminal and calculates the angle of the throttle valve based on the voltage present at the throttle position sensor signal terminal.

When the throttle valve is near the fully closed position, the output voltage of the throttle position sensor is low. When it is near the fully open position, the output voltage is high.

The ecm checks the indicated angle of the throttle valve during stop and go conditions. If the indicated angle (or voltage) in the closed throttle position is out of the specified range, the ecm interprets this as a malfunction in the throttle position sensor and sets a dtc.

Monitor strategy

Typical enabling condition

Typical enabling condition

Stop and go is defined as follows:

Stop and go is defined as follows: stop indicates a vehicle speed of 0 mph (0 km/h). Go indicates a vehicle speed of 18.6 Mph (30 km/h).

Typical malfunction thresholds

Component operating range

Component operating range

Inspection procedure

Throttle/pedal position sensor/switch a circuit range/performance problem
Dtc p0121 throttle/pedal position sensor/switch a circuit range/performance problem Hint: this is the purpose of the throttle position sensor. ...

Inspection procedure
Hint: read freeze frame data using the hand-held tester or the obd ii scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is usefu ...

Other materials:

Oxygen sensor monitor (front and rear o2s system)
Preconditions The monitor will not run unless: mil is off  drive pattern  connect the obd ii scan tool to the dlc3 to check monitor status and preconditions.  Start the engine and allow it to idle for 2 minutes or more.  Drive the vehicle at 25 mph ...

Front differential oil seal (atm)
Replacement 1. Remove front wheels 2. Remove engine under cover rh 3. Remove engine under cover lh 4. Drain automatic transaxle fluid  remove the drain plug, gasket and drain atf.  install a new gasket and drain plug. Torque: 17.5 Nvm (178 Kgfcm, 13 ftlbf) 5. Remove front ...

Inspection procedure
1 Check side air bag sensor assy rh Sst 0984318040 Connect the negative () terminal cable to the battery, and wait at least for 2 seconds.  turn the ignition switch to on, and wait at least for 20 seconds.  clear the dtc stored in memory .  turn the ignition switch ...

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