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 PCM 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 air flow more than threshold value is detected for more than 19 sec., PCM sets P2173. And then MIL(Malfunction Indication Lamp) turns on.

DTC DETECTING CONDITION

Item

Detecting Condition

Possible Cause

DTC Strategy

●

Monitor the measured engine airflow and the estimated airflow

●

Air Leakage between TPS and MAFS

●

Faulty throttle body or intake manifold

●

Faulty MAFS

EnableConditions

●

Engine running

●

No faults present

Threshold

Case 1

●

MAPS reading - ETC estimated airflow ＞ 9 g/s

Case 2

●

MAFS reading - ETC estimated airflow ＞ 7g/s

Diagnosis Time

●

Contineous

(Within 20 sec.)

MIL On Condition

●

1 Driving Cycle

SPECIFICATION
MAFS

Air Flow (kg/h)

Frequency (Hz)

12.6

2617.0

18.0

2958.0

23.4

3241.0

32.4

3653.0

43.2

4024.0

57.6

4399.0

72.0

4704.0

108.0

5329.0

144.0

5897.0

198.0

6553.0

270.0

7240.0

360.0

7957.0

486.0

8738.0

666.0

9644.0

900.0

10590.0

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)

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 "DTC" button, and then Press "DTC Status" 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.

▶ Go to "Check MAFS" as follows.

2.

Check MAFS

(1)

IG "OFF" and install a scantool

(2)

ENG "ON" and monitor "MAFS" data on the service data.

(3)

Monitor signal waveform at signal terminal of MAFS with scantool.

Specification :Signal waveform will be displayed as follows.

(Be aware that the signal of MAFS is not voltage display but frequency display.)

(4)

Are both service data and signalwave form dispayed correctly ?

▶ Go to "Verification of Vehicle Repair" procedure.

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

VERIFICATION OF VEHICLE REPAIR

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

1.

Connect scantool and select "DTC" button.

2.

Press "DTC Status" button and confirm that "DTC Readiness Flag" indicates "Completed". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions

3.

Read "DTC Status" parameter

4.

Is parameter displayed "History(Not Present) fault"?

▶ System performing to specification at this time. Clear the DTC

▶ Go to the applicable troubleshooting procedure.

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