DTC - General Description

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

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

2. COMPONENT DESCRIPTION






3. ENABLE CONDITION






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

5. DIAGNOSTIC METHOD

- Abnormality Judgment
Judge as NG when the following conditions are established.









Time Needed for Diagnosis:
- Difference between target opening angle and actual opening angle: 1000 milliseconds (when target opening angle > actual opening angle) or value of Map 2 (when target opening angle <= actual opening angle)
- Output duty to drive circuit: value of Map 3









- Normality Judgment
Judge as OK and clear the NG if the following conditions are established.






Time Needed for Diagnosis:
- Difference between target opening angle and actual opening angle: 2000 msec
- Output duty to drive circuit: 2000 msec
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

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

7. MALFUNCTION INDICATOR LIGHT CLEAR CONDITIONS
- When the OK driving cycle is completed 3 times in a row
- When "Clear Memory" is performed (Only with engine stopped)

8. FAIL SAFE
Stop the continuity to the electronic throttle control motor. (Throttle opening is fixed to 6°.)

9. ECM OPERATION AT DTC SETTING
Memorize the freeze frame data. (For test mode $02)