DTC Advanced Diagnostics: P2135
DTC P2135:Throttle Position (TP) Sensor A/B Incorrect Voltage Correlation (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). 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 then 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 voltages and the throttle valve positions of TP sensor A and TP sensor B. If the voltage difference is a certain value or less for a set time, the PCM detects a short circuit between TP sensor A and TP sensor B, or if the throttle valve position difference is a certain value for a set time or when the PCM counts up a malfunction for a certain value, the PCM detects an incorrect correlation between TP sensor A and TP sensor B, 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
Minimum
Maximum
TP sensor B voltage
[TP SENSOR B]*
–
2.3 V
Engine start/stop button
ON mode
No active DTCs set (prevents monitor from running)
P0122, P0123, P0222, P0223, P2101, P2118, P2122, P2123, P2127, P2128, P2138, P2176
Other**
After the throttle valve fully closed position registration is completed
*: Short circuit failure

**: Incorrect correlation

[ ]: HDS Parameter

Malfunction Threshold
One of these conditions is met:
TP sensor A and TP sensor B short circuit
The voltage difference between TP sensor A and TP sensor B is 0.20 V or less for at least 200 milliseconds.
TP sensor A and TP sensor B incorrect correlation
The throttle valve position difference between TP sensor A and TP sensor B which depends on the throttle valve position of TP sensor A exceeds the value shown in the table for at least 200 milliseconds or the PCM counts TP sensor A and TP sensor B incorrect correlation condition for 3,800 or more***.

Throttle valve position determined by TP sensor A
Difference between TP sensor A and TP sensor B
0 °
1.8 °
83.3 °
14.7 °

***: When the throttle valve position difference between TP sensor A and TP sensor B which depends on the throttle valve position of TP sensor A exceeds the value shown in the table, the PCM counts up "19" and when it is lower, the PCM counts down "1".

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/B failure
TP sensor A THL1 line short to TP sensor B THL2 line
PCM internal circuit failure

Confirmation Procedure
Operating Condition
1.
Press the engine start/stop button to select the ON mode.
2.
Operate the accelerator pedal.
With the HDS
Do the ETCS TEST in the INSPECTION MENU with the HDS.

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.