DTC P0740/40: Lock-Up Control System
WARNING: This page is about a different variant/trim than selected.
- Using scan tool, retrieve freeze data. Clear DTCs and road test vehicle under same conditions freeze data was recorded. If DTC resets, go to next step. If DTC does not reset, problem is intermittent, check transaxle and PCM connections.
- Using scan tool, check for any other DTCs. If no other DTCs are present, go to next step. If any other DTCs are present, repair those DTCs first, then recheck for DTC P0740/40.
- Test line pressure. See HONDA MDLA & MDMA OVERHAUL article. If line pressure is within specification, go to next step. If line pressure is not within specification, repair hydraulic system as necessary.
- Replace lock-up control solenoid valve "A"/"B" assembly. See LOCK-UP CONTROL SOLENOID VALVE "A"/"B" ASSEMBLY under REMOVAL & INSTALLATION. Turn ignition off. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES under DIAGNOSIS & TESTING. Road test vehicle at speed greater than 55 MPH for more than one minute. Recheck for DTC. If DTC P0740/40 resets, replace transaxle and torque converter. If DTC P0740/40 does not reset, system is okay.