P0122

DTC P0122 Throttle Pedal Position Sensor/Switch "A" Circuit Low Input

HINT: There are the purpose for the "throttle position sensor".

CIRCUIT DESCRIPTION

DTC Detection Condition:

The throttle position sensor is mounted on the throttle body. It has 2 sensors to detect the throttle opening angle and a malfunction of the throttle position sensor.

The voltage applied to the terminals VTA1 and VTA2 of the ECM changes between 0 V to 5 V in proportion to the opening angle of the throttle valve. The VTA1 is a signal to indicate the actual throttle valve opening angle which is used for the engine control, and the VTA2 is a signal to indicate the information about the opening angle which is used for detecting a malfunction.

The ECM judges the current opening angle of the throttle valve from these signals input from terminals VTA1 and VTA2, and the ECM controls the throttle motor to make the throttle valve angle properly in response to the driving condition.

When a malfunction is detected, the throttle valve is locked at a certain opening angle. Also, the whole electronically controlled throttle operation is cancelled until the system returns to normal and the ignition switch is turned OFF.






HINT:

NOTE: When a malfunction is detected, the throttle valve is locked at a certain opening angle. Also, the whole electronically controlled throttle operation is cancelled until the system returns to normal and the ignition switch is turned OFF.

HINT:
- After confirming DTCs, use the hand-held tester or the OBD II scan tool to confirm the throttle valve opening percentage and closed throttle position switch condition.
- The THROTTLE POS means the VTA1 signal and the THROTTLE POS #2 means the VTA2 signal.




Reference (Normal condition):

MONITOR DESCRIPTION

Monitor Strategy:

Typical Enabling Conditions:

Typical Malfunction Thresholds:

Component Operating Range:

The ECM uses throttle position sensor to monitor the throttle valve opening angle.
a. There is an expected specific voltage difference between VTA1 and VTA2 for each throttle opening angle.
- If the difference between VTA1 and VTA2 is incorrect, the ECM interprets this as a fault and will set a DTC.

b. VTA1 and VTA2 each have a specific voltage operating range.
- If VTA1 or VTA2 is out of the normal operating range, the ECM interprets this as a fault and will set a DTC.

c. VTA1 and VTA2 should never be close to the same voltage levels.
- If VTA1 is within the range of ±0.02 V of VTA2, the ECM interprets this as a short circuit in the throttle position sensor system and will set a DTC.

Wiring Diagram:

INSPECTION PROCEDURE

Step 1 - 2:

Step 3:

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, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other data from the time when a malfunction occurred.