Here are the diagnostic tests.
DTC P0740: (FLASH CODE 40) LOCK-UP CONTROL SYSTEM
NOTE:
Do NOT perform this DTC test until all other DTCs have been repaired.
1. Using scan tool, check for any other DTCs. If any other DTCs exist, repair those DTCs first, then recheck for DTC P0740. If no other DTCs exist, go to next step.
2. Test line pressure. If line pressure is within specification, go to next step. If line pressure is not within specification, repair hydraulic system as necessary.
3. Test clutch pressure. If clutch pressure is within specification, go to next step. If clutch pressure is not within specification, repair hydraulic system as necessary.
4. Replace lock-up control solenoid valve assembly. Turn ignition off and clear codes. Road test vehicle at over 50 MPH for more than one minute. Recheck DTCs. If P0740 returns, go to next step. If P0740 does not return, system is okay.
5. Replace torque converter. Turn ignition off and clear codes. Road test vehicle at over 50 MPH for more than one minute. Recheck DTCs. If P0740 returns, replace transaxle. If P0740 does not return, system is okay.
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Monday, February 7th, 2011 AT 5:09 AM
