Component Inspection

Engine Control
P0638 Throttle Actuator Control Range/Performance - Inspection/Repair:_:Component Inspection

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 for sticking condition on throttle valve.
(4) Is the throttle valve normal?
YES
> Go to "Check ETS motor resistance" as follows.
NO
> 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).
A. Specification : Approx. 1.275 - 1.725Ohms @ 23°C (73.4°F)




(4) Is the measured resistance within specification?
YES
> Go to "ETC motor actuation test" procedure.
NO
> 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 maintain this condition until the main relay is turned off.(It will take 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?
YES
> 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.
NO
> 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 maintain this condition until the main relay is turned off.(It will take 10 second)
3. Turn ignition key on more than 1second to record the throttle motor position on the EEPROM