Honda 2004 Odyssey Service Manual page 938

DTC P0740: Problem in Lock-up Control
System
NOTE:
• Record all freeze data and review General
Troubleshooting Information (see page 14-247)
before you troubleshoot.
• Keep these replacement solenoid valves on hand:
– Torque converter clutch solenoid valve
– A/T clutch pressure control solenoid valve C
1. Check whether the scan tool or the HDS indicates
another code.
Does the scan tool or the HDS indicate another
code?
YES Perform the Troubleshooting Flowchart for
the indicated code(s). Recheck for code P0740 after
troubleshooting.
NO Go to step 2.
NOTE: Do not continue with this troubleshooting
until the causes of any other DTCs have been
corrected.
2. Measure the line pressure (see page 14-355).
Is the line pressure within the service limit?
YES Go to step 3.
NO Replace the transmission.
3. Replace torque converter clutch solenoid
valve (see page 14-357).
4. Replace A/T clutch pressure control solenoid valve
C (see page 14-363).
5. Clear the DTC with the scan tool or the HDS.
6. Using the scan tool, check to be sure that the
engine coolant temperature is 176°F (80°C) or
above.
7. Drive the vehicle under the same conditions as
those indicated by the freeze data, or at 55 mph
(88 km/h) with very steady throttle for more than 1
minute.
8. Recheck for code P0740.
Does the scan tool or the HDS indicate code
P07 40?
YES Remove the torque converter and inspect the
O-ring. If the O-ring is missing, replace the O-ring.
If the O-ring is damaged or OK, replace the
transmission and torque converter.
NO The system is OK at this time.
14-325