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COMPONENT LOCATION

GENERAL DESCRIPTION

The Throttle Control Actuator is mounted on throttle body of diesel engine and controls throttle valve according to PWM (Pulse With Modulation) signal from ECM.

It consists of;

a DC motor which actuates the throttle valve,

a 2-step gear (transmission ratio = 1:40) which is located in between the DC motor and the throttle valve and increases torque of the DC motor,

a position sensor which is a hall-effect sensor and detects status of the throttle valve,

an electric control unit which is a micro-controller and drives the DC motor by the PWM (Pulse With Modulation) signal from the ECM,

and a reset spring which resets the de-energized throttle valve to its open position.

Its function is described below:

Anti-judder function: When engine is shut off, the ECM can prevent intake air from entering to intake manifold by fully closing the throttle valve for 1.5 seconds (95% ＜ Duty ＜97%) to reduce engine vibration.

Intake air control for EGR: When exhaust gas pressure is equal to or lower than intake air pressure (for example, when low engine speed), the exhaust gas would not enter to the intake manifold. At this time, the ECM partially closes the throttle valve (5% ＜ Duty ＜ 94%) to reduce the intake air quantity. The intake air pressure thus is lower than the exhaust gas pressure.

Exhaust gas temperature control for CPF regeneration: When the Catalyzed Particulate Filter (CPF) is need to regenerate, the ECM partially closes the throttle valve (5% ＜ Duty ＜ 94%) to reduce the intake air quantity. At this time, the air-fuel ratio would become rich and the exhaust gas temperature would be high enough to burn the soot inside the CPF.

DTC DESCRIPTION

P2111 is set when excessive current in throttle control actuator is detected for more than 1 sec. this code is due to short to battery in control circuit or internal short of actuator component.

DTC DETECTING CONDITION

Item	Detecting Condition		Possible Cause
DTC Strategy	● Voltage monitoring		● Throttle Control Actuator circuit ● Throttle Control Actuator component
Enable Conditions	● IG KEY "ON"
Threshold Value	● Short to battery
Diagnostic Time	● 1 sec.
Fail Safe	Fuel cut	NO
	EGR Off	YES
	Fuel Limit	NO
	Check Lamp	NO

SPECIFICATION

Throttle control actuator fully opened	Throttle control actuator fully closed	Throttle control actuator operating Hz
5%	95%	250±7.5 Hz

SCHEMATIC DIAGRAM

SIGNAL WAVEFORM AND DATA

MONITOR SCANTOOL DATA

Connect Scantool to Data Link Connector (DLC).

Warm engine up to normal operating temperature.

Turn "OFF" electrical devices and A/C.

Monitor "INLET THROTTLE ACTUATOR." parameter on the Scantool.

Specification : 4.7% duty outputted except the operation of throttle flap

95% duty outputted at the operation of throttle flap

※Monitoring if the state of throttle control actuator changes at turning engine OFF because the communication through Scantool is comleted 3 sec. after turning engine ON. It is the easiest way to check if throttle control actuator is closed for about 1 sec. and opened again with eyes(visually) or ears(sound) in order to inspect component operation.

TERMINAL AND CONNECTOR INSPECTION

Electrical systems consist of a lot of harness and connectors, poor connection of terminals can cause various problems and damge of component.

Perform checking procedure as follows.

(1)

Check damage of harness and terminals : Check terminals for contact resistance, corrosion and deformation.

(2)

Check connecting condition of ECM and component connector : Check terminal seperation, damage of locking device and connecting condition between terminal and wiring.

note

Disconnect the pin which requires checking at male connector and insert it to the terminal at female connector for checking connecting condition. ( after checking, reconnect the pin at correct position. )

Is the problem found?

▶ Repair the trouble causing part and go to "Verification of Vehicle Repair".

▶ Go to "Power Circuit Inspection".

POWER CIRCUIT INSPECTION

IG KEY "OFF", ENGINE "OFF"

Disconnect Throttle control actuator.

IG KEY "ON"

Measure the voltage of Throttle control actuator connector terminal 3.

Specification : 11.5V~13.0V

Is the measured voltage within the specification?

▶ Go to "Control Circuit Inspection".

▶ Repair E/R FUSE ＆ RELAY BOX 15A SENSOR #2 FUSE and related circuit and go to "Verification of Vehicle Repair".

CONTROL CIRCUIT INSPECTION

Check control circuit voltage

(1)

IG KEY "OFF", ENGINE "OFF"

(2)

Disconnect Throttle control actuator connector.

(3)

IG KEY "ON"

(4)

Measure the voltage of Throttle control actuator connector terminal 2.

specification : 0.0V~0.1V

(5)

Is the measured voltage within the specification?

▶ Go to "2.Check open in control circuit".

▶ Repair short to battery in control circuit and go to "Verification of Vehicle Repair".

Check open in control circuit

(1)

IG KEY "OFF", ENGINE "OFF"

(2)

Disconnect Throttle control actuator connector and ECM connector.

(3)

Check continuity between throttle control actuator connector terminal 2 and ECM connector (C230-K) terminal 90.

specification : Continuity (below 1.0Ω)

(4)

Is the measured resistance within the specification? (Is continuity confirmed?)

▶ Go to "3. Check short to ground in control circuit" as follows.

▶ Repair open in throttle control actuator control circuit and go to "Varification of Vehicle Repair".

Check short to ground in control circuit

(1)

IG KEY "OFF", ENGINE "OFF"

(2)

Disconnect Throttle control actuator connector.

(3)

Check continuity between throttle control actuator connector terminal 2 and chassis ground.

specification : Discontinuity (Infinite Ω)

(4)

Is the measured resistance within the specification? (Is control circuit insulated with ground?)

▶ Go to "Ground Circuit Inspection".

▶ Repair short to ground in control circuit and go to "Verification of Vehicle Repair".

GROUND CIRCUIT INSPECTION

IG KEY "OFF", ENGINE "OFF"

Disconnect Throttle control actuator connector.

IG KEY "ON"

Measure the voltage of Throttle control actuator connector terminal 3. [ TEST "A" ]

Measure the voltage between Throttle control actuator connector terminal 3 and 4. [ TEST "B" ]

( terminal 3 : Check + prove , terminal 4 : Check - prove )

Specification : [TEST "A"] Voltage - [TEST "B"] Voltage = below 200mV

Is the measured voltage within the specification?

▶ Go to "Component Inspection".

▶ When "B" voltage is not detected : Repair open in ground circuit(G15 ground point related circuit) and go to "Verification of Vehicle Repair".

▶ When the voltage difference between "A" and "B" is above 200mV : Eliminate the causes of excessive resistance and go to "Verification of Vehicle Repair".

COMPONENT INSPECTION

Throttle control actuator component visual inspection

(1)

IG KEY "OFF", ENGINE "OFF"

(2)

Disconnect intake hose connected to throttle control actuator.

(3)

Check if throttle control actuator is contaminated with carbon fraction.

(4)

Check if throttle flap moves smoothly as touching it with hand (perform this process at IG KEY "OFF" state.)

※ Check if abnormal noise, valve shaft stuck, too much wear are detected.

Specification : Flap moves smoothly and carbon fraction, too much wear, abnormal noise are not detected.

(5)

Is throttle control actuator is OK after performing visual inspection?

▶ Go to "2. Throttle control actuator operating test" as follows.

▶ If same symptom is detected after clear carbon fraction up, replace throttle control actuator and go to "Verification of Vehicle Repair".

Throttle control actuator operating test

(1)

IG KEY "OFF", ENGINE "OFF"

(2)

Disconnect intake hose connected to throttle control actuator.

(3)

ENGINE "ON"

(4)

Check if throttle control actuator is in wide open state during engine running.

(5)

ENGINE "OFF"

(6)

Check if throttle flap is closed once and opened again at the point of turning engine OFF.

※ Check if abnormal noise or irregular moving of flap is detected.

Specification : Throttle flap moves smoothly.

at engine ON : Throttle control actuator opened

at the point of turning engine OFF : Throttle flap is closed once and opened again

(7)

Is throttle flap moves smoothly?

▶ Go to "Verification of Vehicle Repair".

▶ Replace throttle control actuator and go to "Verification of Vehicle Repair".

VERIFICATION OF VEHICLE REPAIR

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

After connecting Scantool select "DIAGNOSTIC TROUBLE CODES(DTCs)" mode.

Clear recorded DTC using Scantool.

Drive the vehicle within DTC "Enable conditions" in "General information".

After selecting "DIAGNOSTIC TROUBLE CODES(DTCs)" mode and check if DTC is recorded again.

Are any DTCs recorded ?

▶ Go to the DTC guide of recorded NO. in Scantool.

▶ System operates within specification.