DTC Advanced Diagnostics: P2176
DTC P2176:Throttle Actuator Control System Idle Position Not Learned (Engine Type: K24W1)

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). When the accelerator pedal is pressed, the APP sensor detects the accelerator pedal opening value. The accelerator pedal opening value is converted to a signal in the APP sensor and transmitted to the PCM to compute the target position. The PCM determines the throttle valve target position according to the signal received and operates the throttle actuator to move the throttle valve to the target position. The actual throttle valve position is determined by TP sensors A and B (installed in the throttle body). The PCM transmits a signal to the throttle actuator and moves the throttle valve to the fully closed position to register the throttle valve fully closed position after the ignition switch is turned to LOCK (0), or the engine start/stop button is pressed to select the OFF mode. When the registration of the throttle valve fully closed position is not completed within a predetermined time or the registered value is out of predetermined range after the ignition switch is turned to LOCK (0), or the engine start/stop button is pressed to select the OFF mode, the PCM detects a malfunction in the electronic throttle control system and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type, OBD Status
Execution
Once per driving cycle
Sequence
None
Duration
2.0 seconds or more
DTC Type
One drive cycle, MIL on
OBD Status
PASSED/FAILED/NOT COMPLETED (STILL TESTING)

Enable Conditions
Condition
Minimum
Maximum
Battery voltage [BATTERY]
6.0 V
–
Ignition switch*1
LOCK (0)
Engine start/stop button*2
OFF mode
No active DTCs set (prevents monitor from running)*3
P0122, P0123, P0222, P0223, P2101, P2118, P2122, P2123, P2127, P2128, P2135, P2138
No active DTCs set (prevents monitor from running)*4
P0122, P0123, P0222, P0223, P1659, P2101, P2118, P2135
*1: Without keyless access system

*2: With keyless access system

*3: 2013, 2014 models

*4: 2015 model on and after

[ ]: HDS Parameter

Malfunction Threshold
One of these conditions is met for at least 2.0 seconds:
The registration of the throttle valve fully closed position is not completed within a predetermined time after the ignition switch is turned to LOCK (0), or the engine start/stop button is pressed to select the OFF mode.
The registered value of the throttle valve fully closed position is 0.74* (1.61)** V or more, or 0.49* (1.37)** V or less.

*: TP sensor A [TP SENSOR A]

**: TP sensor B [TP SENSOR B]

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.
PCM failure
Throttle actuator MTR1 line failure
Throttle actuator MTR2 line failure
Throttle actuator failure
TP sensor A/B failure
Throttle body 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.