DTC P0740
DTC P0740 Torque converter clutch (TCC) system malfunction
DETECTION
CONDITION
- Difference between the engine speed and turbine speed remains "vehicle
speed/2+40" rpm or more for 10 s or more during TCC operation in 3GR or 4GR
while driving.
(Ex. When driving at a vehicle speed of 100 km/h, the difference will be 100/2+40
= 90 rpm. Therefore, a malfunction will be detected if a speed difference of 90
rpm continues for 10 s or more.)Diagnostic support note:- This is continuous monitor (CCM).
- MIL illuminates if TCM detects the above malfunction conditions in two
consecutive drive cycles. - PENDING CODE is available.
- FREEZE FRAME DATA is available.
- AT warning light does not illuminate.
- DTC is stored in TCM memory.
POSSIBLE
CAUSE
- ATF level low
- Deteriorated ATF
- TCC solenoid valve and pressure control solenoid valve stuck
- Line pressure low
- Oil pump malfunction
- Control valve stuck
- Torque convert clutch malfunction
- TCM malfunction
(w) RX-8 Transmission (Manual & Auto)