Honda 2004 Odyssey Service Manual page 687

Automatic Transmission
DTC Troubleshooting (cont'd)
1999-2000 Models
DTC P0740: Problem in Lock-up Control
System
NOTE:
• Record all freeze data and review General
Troubleshooting Information (see page 14-3) before
you troubleshoot.
• Keep replacement control solenoid valves on hand:
– Lock-up control solenoid valve assembly (lock-up
control solenoid valve/shift control solenoid valve
A assembly)
– A/T clutch pressure control solenoid valve A/B
assembly
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 14-128).
Is the line pressure within the service limit?
YES Go to step 3.
NO Replace the transmission.
3. Replace the Lock-up Control Solenoid Assembly set
(lock-up control solenoid valve/shift control
solenoid valve A assembly (see page 14-130) and
the A/T clutch pressure control solenoid valve A/B
assembly (see page 14-133)).
4. Clear the DTC with the scan tool or the HDS.
14-74
5. Using the scan tool, check to be sure that the
engine coolant temperature is 176°F (80°C) or
above.
6. Drive the vehicle under the same conditions as
those indicated by the freeze data for more than 1
minute, or drive the vehicle at 55 mph (88 km/h)
with TPS voltage 0.8 V for more than 1 minute.
7. Recheck for code P0740.
Does the scan tool or the HDS indicate code
P07 40?
YES Inspect the O-ring on the torque converter. 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.