DTC Advanced Diagnostics: P0123
DTC P0123:Throttle Position (TP) Sensor A Circuit High Voltage (Engine Type: J35Y1, J35Y2)

General Description

The electronic throttle control system controls the throttle valve opening. The system includes the throttle actuator, the throttle valve, throttle position (TP) sensors A and B, the electronic throttle control system (ETCS) control relay, the accelerator pedal position (APP) sensor, and the powertrain control module (PCM). TP sensor A is a semiconductor type, and it is attached to the throttle body and shaft to determine throttle valve position. The throttle valve position signal from TP sensor A is transmitted to the PCM for target position feedback control. If the signal from TP sensor A is a fixed value for a set time, the PCM detects a TP sensor A malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type, OBD Status
Execution
Continuous
Sequence
None
Duration
200 milliseconds or more
DTC Type
One drive cycle, MIL on
OBD Status
PASSED/FAILED/NOT COMPLETED (STILL TESTING)

Enable Conditions
Condition
 
Engine start/stop button
ON mode
No active DTCs set (prevents monitor from running)*1
P0122, P0222, P0223, P2101, P2118, P2122, P2123, P2127, P2128, P2135, P2138, P2176
No active DTCs set (prevents monitor from running)*2
P0122
*1: 2013, 2014 models

*2: 2015 model on and after

Malfunction Threshold
The TP sensor A output voltage [TP SENSOR A] is 4.8 V or more for at least 200 milliseconds.

[ ]: HDS Parameter

Possible Cause
NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
TP sensor A failure
TP sensor A THL1 line open
TP sensor A SG line open
PCM internal circuit failure

Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected, the MIL comes on and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the PCM memory.

Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the battery.