DTC Advanced Diagnostics: P2101
DTC P2101:Electronic Throttle Control System (ETCS) Malfunction

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 PGM-FI subrelay circuit, 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 sensor A (installed in the throttle body). The PCM compares the throttle valve target opening angle and the actual throttle valve opening angle from TP sensor A, and when the difference exceeds the specification, the PCM detects the malfunction of the electronic throttle control system and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type
Execution
Continuous
Sequence
None
Duration
250 milliseconds or more*, 500 milliseconds or more**
DTC Type
One drive cycle, MIL on
*: Throttle valve closed direction
**: Throttle valve open direction

Enable Conditions
Condition
Minimum
Maximum
12 volt battery voltage [BATTERY]
6.0 V
–
Vehicle
ON mode
[ ]: HDS Parameter

Malfunction Threshold
One of the conditions in this table is met for at least 250 milliseconds* (500 milliseconds**).

Throttle valve target position
Difference between throttle valve target position and actual throttle valve position
2 °
4 ° or more
6 °
5.4 ° or more
10 °
5.7 ° or more
15 °
6 ° or more
90 °
6 ° or more

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 internal circuit failure
Throttle actuator MTR1 line failure
Throttle actuator MTR2 line failure
Throttle body internal 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 12 volt battery.