Toyota Tacoma manuals

Toyota Corolla Repair Manual: Circuit description

The throttle position sensor is mounted in the throttle body and

The throttle position sensor is mounted in the throttle body and detects the throttle valve opening angle.

When the throttle valve is fully closed, a voltage of approximately 0.3 To 1.0 V is applied to terminal vta of the ecm. The voltage applied to terminal vta of the ecm increases in proportion to the opening angle of the throttle valve and becomes approximately 3.2 To 4.9 V when the throttle valve is fully opened. The ecm judges the vehicle driving conditions from these signals input from terminal vta, uses them as one of the conditions for deciding the airfuel ratio correction, power increase correction and fuelcut control etc.

Hint:

Hint

: after confirming dtcs, confirm the throttle valve opening percentage and closed throttle position switch condition using the handheld tester or the obd ii scan tool.

Monitor description

Monitor description

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

If the ecm detects that the output voltage of the throttle position sensor is out of the normal 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

Typical malfunction thresholds

Typical malfunction thresholds

Component operating range

Component operating range

Wiring diagram

Wiring diagram

Inspection procedure

Throttle/pedal position sensor/switch a circuit
Dtc p0120 throttle/pedal position sensor/switch a circuit Dtc p0122 throttle/pedal position sensor/switch a circuit low input Dtc p0123 throttle/pedal position sensor/switch a circuit high ...

Inspection procedure
Hint: if different dtcs related to different systems that have terminal e2 as the ground terminal are output simultaneously, terminal e2 may be open. Read freeze frame data using the hand-h ...

Other materials:

Dtc check/clear
1. Dtc check (normal mode) Notice: handheld tester only: when the diagnostic system is switched from the normal mode to the check mode, all the dtcs and freeze frame data recorded in the normal mode will be erased. So before switching modes, always check the dtcs and freeze frame data, and n ...

Inspection procedure
Hint: if different dtcs related to different systems that have terminal e2 as the ground terminal are output simultaneously, terminal e2 may be open. Read freeze frame data using the hand-held tester or the obd ii scan tool. Freeze frame data records the engine conditions when a malf ...

Changing the engine switch positions
1 LOCK The steering wheel is locked and the key can be removed. (Vehicles with an automatic transmission or continuously variable transmission: The key can be removed only when the shift lever is in P.) 2 ACC Some electrical components such as the audio system can be used. 3 ON All ele ...

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