COMPONENT LOCATION
GENERAL DESCRIPTION

The Electronic Throttle Control(ETC) system is made of the components throttle body, Throttle Position Sensor(TPS)1＆2 and Accelerator Position Sensor(APS) 1＆2. The throttle body contains the actuator, the throttle plate and the throttle position sensor (potentiometer), which are integrated in one housing. The actuator consists of a DC motor with a two-stage gear. The opening angle of the throttle valve is detected by the throttle position sensor which is mounted on the throttle body. And it provides feedback to the ECM to control the throttle motor in order to control the throttle valve opening angle properly in response to the driving condition.

DTC DESCRIPTION

Comparing real intake air flow and the intake air flow calculated by ETS, under detecting condition, if the difference of air flow more than threshold is detected for more than 3.9 sec., PCM sets P2173 and then MIL(Malfunction Indication Lamp) turns on.

DTC DETECTING CONDITION

Item

Detecting Condition

Possible Cause

DTC Strategy

●

The engine airflow measurements not based on throttle position are compared with throttle position based estimated airflow.

●

Air Leakage between TPS and MAFS

●

Faulty throttle body

●

Faulty PCM

Enable Conditions

●

Engine running

●

Throttle Actuation Mode is not OFF

●

MAP Sensor is not failed

●

MAF Sensor is not failed

●

IAT sensor is not failed

Threshold

Case 1

●

Speed-Density Airflow - ETC estimated airflow 〉 9 g/s

Case 2

●

MAF reading - ETC estimated airflow 〉 7g/s

Diagnosis Time

●

Contineous

(More than 3.9sec. Failure for every 15.6sec. Test)

MIL On Condition

●

1 Driving Cycle

SPECIFICATION
MAFS

Air flow (kg/h)

Frequency (Hz)

0 kg/h

720 ~ 880 Hz

12.6 kg/h

2,595 Hz

18.0 kg/h

2,930 Hz

23.4 kg/h

3,208 Hz

32.4 kg/h

3,609 Hz

43.2 kg/h

3,975 Hz

57.6 kg/h

4,361 Hz

72.0 kg/h

4,683 Hz

108.0 kg/h

5,362 Hz

144.0 kg/h

5,885 Hz

198.0 kg/h

6,527 Hz

270.0 kg/h

7,219 Hz

360.0 kg/h

7,945 Hz

486.0 kg/h

8,736 Hz

666.0 kg/h

9,660 Hz

900.0 kg/h

10,613 Hz

TPS

Throttle opening (°)

Output voltage(V) [Vref=5.0V]

TPS1

TPS2

0°

0.0V

5.0V

10°

0.5V

4.5V

V20°

0.9V

4.1V

30°

1.4V

3.6V

40°

1.8V

3.2V

50°

2.3V

2.7V

60°

2.7V

2.3V

70°

3.2V

1.8V

80°

3.6V

1.4V

90°

4.1V

0.9V

100°

4.5V

0.5V

110°

5.0V

0.0V

MAPS

Pressure(kPa)(kPa)

Output voltage(V)

20.0kPa

0.79V

35kPa

1.382V

46.66kPa

1.84V

60kPa

2.369V

90kPa

3.75V

101.32kPa

4.00V

SCHEMATIC DIAGRAM
MONITOR DTC STATUS
1.

Check DTC Status

(1)

Connect scantool to Data Link Connector(DLC).

(2)

IG "ON".

(3)

Select "Diagnostic Trouble Codes(DTCs)" mode, and then Press F4(DTAL) to check DTC's information from the DTCs menu

(4)

Read "DTC Status" parameter.

(5)

Is parameter displayed "Present fault"?

▶ Go to "System inspection" procedure.

▶ Fault is intermittent caused by poor contact in the sensor’s and/or PCM’s connector or was repaired and PCM memory was not cleared. Thoroughly check connectors for looseness, poor connection, ending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.

SYSTEM INSPECTION
1.

Visual Inspection

(1)

Check the air hose between MAFS and throttle body is torn or installation.

(2)

Check deforamtion, crack or installation of throttle valve(body)

(3)

Has a problem been found ?

▶ Substitute with a known-good Air hose or throttle body and check for proper operation.

If the problem is corrected,replace air hose or throttle body and then go to "Verification of Vehicle Repair" procedure.

▶ Substitute with a known-good PCM and check for proper operation. If the problem is corrected,replace PCM and then go to "Verification of Vehicle Repair" procedure.

note

There is a memory reset function on scantool that can erase optional parts automaticallydetected and memorized by PCM.

Before or after testing PCM on the vehicle, use this function to reuse the PCM on the others

※ Procedure of ETS Initialization
1.

Erase the trouble codes on PCM

2.

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

3.

Turn ignition key on more than 1second 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 the DTCs

3.

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

4.

Monitor that all rediness test have been verified as " Complete "

5.

Are any DTCs present ?

▶ Go to the applicable troubleshoooting procedure.

▶ System is performing to specification at this time.

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