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

Checking output signals from TPS under detecting condition, if the difference between real and target throttle position is above the specified value, PCM sets P0638 and then MIL(Malfunction Indication Lamp) turns on.

DTC DETECTING CONDITION

Item

Detecting Condition

Possible cause

DTC Strategy

●

Monitor the throttle position

●

Throttle stuck

●

Open in motor circuit

●

Faulty motor

●

Faulty PCM

Enable Conditions

●

Engine works

●

Battery voltage ＞5V

Thresh old value

Case1

●

The difference between the real ETS motor & TPS value and the target ETS motor & TPS value is over 4.5°.

Case2

●

When real Throttle position 〈36°, real throttle position - target throttle position ＜ - 4.5°

Case3

●

(the real throttle position - the target throttle position)＜ - 18°

Diagnosis Time

●

Continuous

MIL On Condition

●

1 driving cycle

SIGNAL WAVEFORM
SPECIFICATION

Throttle opening (°)

Output voltage (V) [Verf = 5.0V]

TPS1

TPS2

0°

0.0V

5.0V

10°

0.5V

4.5V

20°

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

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 "Terminal and connector 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.

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?

▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure

▶ Go to " Control Circuit Inspection " procedure.

CONTROL CIRCUIT INSPECTION
1.

Check voltage

(1)

IG "OFF".

(2)

Disconnect ETS motor ＆ TPS connector.

(3)

IG "ON" and ENG "OFF"

(4)

Measure the voltage between terminal 5(8) of ETS motor ＆ TPS harness connector and chassis ground.

Specification : Approx. 12V

(5)

Is the measured voltage within specification?

▶ Go to "Component inspection" procedure.

▶ Go to "Check open in harness" as follows.

2.

Check open in harness

(1)

IG "OFF"

(2)

Disconnect ETS motor ＆ TPS connector and PCM connector.

(3)

Measure the resistance between terminal 5 of ETS motor ＆ TPS harness connector and terminal 2 of PCM harness connector.

(4)

Measure the resistance between terminal 8 of ETS motor ＆ TPS harness connector and terminal 1 of PCM harness connector.

Specification : Approx. below 1Ω

(5)

Is the measured resistance within specification ?

▶ Go to "Component inspection" procedure.

▶ Repair Open in motor harness and go to "Verification of Vehicle Repair" procedure.

COMPONENT INSPECTION
1.

Check throttle valve for stuck

(1)

IG "OFF".

(2)

Disconnect the air hose between throttle body and air mass flow sensor.

(3)

Check stuck on throttle valve.

(4)

Is the throttle valve normal?

▶ Go to check "ETS motor resistance" as follows.

▶ Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.

2.

Check ETS motor resistance

(1)

IG "OFF".

(2)

Disconnect ETS motor ＆ TPS connector.

(3)

Measure the resistance between terminal 5 and 8 of ETS motor ＆ TPS connector(component side).

Specification : Approx. 1.275 ~ 1.725Ω @ 23℃ (73.4℉)

(4)

Is the measured resistance within specification?

▶ Go to "ETC motor actuation test" procedure.

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

※ 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 10 second)

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

3.

ETC motor actuation test

(1)

IG "OFF".

(2)

Connect ETS motor ＆ TPS connector.

(3)

After IG "ON", execute the "ETC motor actuation test" by Scantool.

(4)

Does the "ETC motor actuation test" execute normally?

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

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

※ 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 10 second)

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.

Connect scan tool and select "Diagnostic Trouble Codes(DTCs)" mode

2.

Press F4(DTAL) and confirm that "DTC Readiness Flag" indicates "Complete". 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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