P2125

P2125 Acceleration Position Sensor 2 Circuit

Component Location






General Description

The ETS (Electronic Throttle System) is the throttle body whose throttle angle is controlled by control module. It consists of ETS unit, ETS-motor, Accelerator Position Sensor (APS),Throttle Position Sensor (TPS) and Limp home valve. Among above-mentioned parts , APS consists of APS1, APS2 and idle switch which detects the closed throttle position. When a driver steps on the gas pedal, the output signal of APS1 is sent to ETS unit and that of APS2 is sent to the PCM. And then the PCM sends throttle valve target opening value to ETS unit after calculating from signals such as APS and other input values. The ETS unit controls ETS motor to meet PCM's throttle valve target opening value.

DTC Description

This DTC is set if the difference between the output voltage of APS1 and that of APS2 is higher than 1V.

DTC Detecting Condition






- Vaps1: Output voltage of APS1, Vaps2: Output voltage of APS2

Specification






Schematic Diagram






Signal Waveform






Terminal and Connector Inspection

1. Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.

2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.

3. Has a problem been found?

YES

1) Repair as necessary and then go to "Verification of Vehicle Repair" procedure

NO

1) Go to "Component Inspection" procedure.


Component Inspection

Check APS

1. Ignition "OFF".

2. Disconnect APS connector.

3. Measure resistance between terminal "7" and "8" of APS connector (APS1).

4. Measure resistance between terminal "1" and "2" of APS connector (APS2).

A. Specification: Approx. 3.5 ~ 6.5 k ohms at 20°C(68°F)









5. Monitor the signal output of APS1/APS2 during stepping on the accelerator pedal slowly.

A. Specification

1) Approx. 0.3 ~ 1.0V (when not stepping on the accelerator pedal)

2) Approx. 4.0 ~ 5.5V (when stepping on the accelerator pedal fully)

6. Is the resistance or the signal voltage within specifications?

YES

1) Substitute with a known-good ETS unit or PCM and check for proper operation. If the problem is corrected,replace ETS unit or PCM and then go to "Verification of Vehicle Repair" procedure.
If the ETS unit needs to be replaced, do initialization after it is replaced.

NO

1) Check APS for contamination, deterioration, or damage. Substitute with a known-good APS and check for proper operation.If the problem is corrected, replace APS and then go to "Verification of Vehicle Repair" procedure.

- Procedure of Initialization

1. Erase the trouble codes on PCM.

2. Turn the ignition key on less than 1second and turn it off (Do not start the engine).

3. Turn the ignition key off and keep this condition until the main relay is turned off. (It will takes 10 second)

4. Turn ignition key on more than 1 second to record the throttle motor position on the EEPROM.


Verification of Vehicle Repair

After a repair, it is essential to verify that the fault has been corrected.

1. Monitor and record the Freeze Frame Data for the Diagnostic Trouble Code (DTC) which has been diagnosed.

2. Using a Scantool, Clear DTC.

3. Operate the vehicle within conditions noted in the freeze frame data or enable conditions

4. Monitor that all readiness test have been verified as "Complete"

5. Are any DTCs present ?

YES

1) Go to the applicable troubleshooting procedure.

NO

1) System is performing to specification at this time.