Component Inspection

Engine Control
P0638 Throttle Actuator Control Range/Performance (Bank 1) - Inspection/Repair:_:Component Inspection

Component Inspection

Check throttle valve for stuck
1. IG "OFF" and disconnect the air hose between throttle body and air mass flow sensor.
2. Check stuck on throttle valve.
3. Is the throttle valve normal?

Check ETC motor resistance
1. IG "OFF" and disconnect ETC Motor & TPS connector.
2. Measure the resistance between ETC motor(+) and (-) terminals of ETC Motor & TPS connector (component side).

Specification :Approx. 1.275 - 1.725Ohms @ 23°C(73.4°F)

3. Is the throttle valve normal?

** Procedure of ETS Initialization
A. Erase the trouble codes on PCM
B. Turn the ignition key "OFF" until the main relay is turned off. (It will take about 10 sec.)
C. Turn ignition key "ON" more than 1 second to record the throttle motor position in the EEPROM
ETC motor actuation test
1. IG "OFF" and connect ETC Motor & TPS connector.
2. After IG "ON", execute the "ETC motor actuation test" by GDS.

3. Is the measured resistance within specification ?