P0638 (U5/Low Emissions)

DTC P0638 - THROTTLE ACTUATOR CONTROL RANGE/PERFORMANCE (BANK 1)

OUTLINE OF DIAGNOSIS
Judge NG when the target opening angle and actual opening angle is mismatched or the current to motor is more than specified duty for specified time continuously.




COMPONENT DESCRIPTION




ENABLE CONDITION

GENERAL DRIVING CYCLE
Always perform the diagnosis continuously when the electric control throttle is operating.

DIAGNOSTIC METHOD




Judge OK and clear NG when the malfunction criteria are completed.

Time Needed for Diagnosis:







Target opening angle and actual opening angle: 250 milliseconds (For NG) 2000 milliseconds (For OK)
Output duty to drive circuit: 2000 milliseconds

DTC CLEAR CONDITION
- When the OK idling cycle was completed 40 times in a row
- When "Clear Memory" was performed (Only engine stopped)

MALFUNCTION INDICATOR LIGHT CLEAR CONDITION
- When the OK driving cycle was completed 3 times in a row
- When "Clear Memory" was performed (Only engine stopped)

FAIL SAFE
Stop the current to electric control throttle motor. (Fix the throttle opening angle to 6 °.)

ECM OPERATION AT DTC SETTING
- Memorize the freeze frame data. (For test mode $02)
- Memorize the diagnosis value and malfunction criteria value. (For test mode $06)