DTC P0638 [L8, LF]
id0102b1809800
|
DTC P0638 |
Throttle valve actuator control circuit range/performance problem |
|---|---|
|
DETECTION CONDITION
|
• The PCM compares the actual TP with the target TP when the engine is running. If the difference is more than the specification, the PCM determines that there is a throttle valve actuator control circuit range/performance problem.
Diagnostic support note
• This is a continuous monitor (CCM).
• The MIL illuminates if the PCM detects the above malfunction condition during the first drive cycle.
• FREEZE FRAME DATA (Mode 2/Mode 12) is available.
• The DTC is stored in the PCM memory.
|
|
POSSIBLE CAUSE
|
• Throttle valve actuator malfunction
• PCM malfunction
|
Diagnostic procedure
|
STEP |
INSPECTION |
ACTION |
|
|---|---|---|---|
|
1
|
VERIFY FREEZE FRAME DATA (MODE 12) HAS BEEN RECORDED
• Has the FREEZE FRAME DATA (Mode 12) been recorded?
|
Yes
|
Go to the next step.
|
|
No
|
Record the FREEZE FRAME DATA (Mode 12) on the repair order, then go to the next step.
|
||
|
2
|
VERIFY RELATED SERVICE INFORMATION AVAILABILITY
• Verify related Service Information availability.
• Is any related Service Information available?
|
Yes
|
Perform repair or diagnosis according to the available Service Information.
• If the vehicle is not repaired, go to the next step.
|
|
No
|
Go to the next step.
|
||
|
3
|
VERIFY RELATED PENDING CODE AND STORED DTC
• Turn the ignition switch off, then to the ON position (engine off).
• Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure.
• Are any DTCs present?
|
Yes
|
Go to the applicable DTC troubleshooting.
(See DTC TABLE [L8, LF].)
|
|
No
|
Go to the next step.
|
||
|
4
|
INSPECT THROTTLE VALVE ACTUATOR
• Inspect the throttle valve actuator.
• Is there any malfunction?
|
Yes
|
Replace the throttle body, then go to the next step.
|
|
No
|
Go to the next step.
|
||
|
5
|
VERIFY DTC TROUBLESHOOTING COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the PCM memory using the M-MDS.
• Start the engine and warm it up completely.
• Perform the DTC Reading Procedure.
• Is the same DTC present?
|
Yes
|
Replace the PCM, go to the next step.
|
|
No
|
Go to the next step.
|
||
|
6
|
VERIFY AFTER REPAIR PROCEDURE
• Perform the “AFTER REPAIR PROCEDURE”.
• Are any DTCs present?
|
Yes
|
Go to the applicable DTC troubleshooting.
(See DTC TABLE [L8, LF].)
|
|
No
|
DTC troubleshooting completed.
|
||