Service Manual

Transmission Troubleshooting
3-34 627333-A
TROUBLESHOOTING
When a error is active for more than 3 seconds, it will
automatically appear as a code in the transmission
display. Error code will disappear when the error is not
active anymore. The error code will be stored in the
ECU and in the TCU
When errors are shown, first check for visible
malfunctions. For example, broken or loosen
connectors or incorrect battery voltage.
When you cannot find the problem, find the error code
in the display and search the explanation in this manual
or in the recommend manual.
Complete explanation overview of the functions and
troubleshooting of the gearbox can be found the CAT
manuals.
Visual Inspection
Perform a visual inspection at the beginning of
troubleshooting a problem. Perform the inspection
while the engine is turned off. Put the transmission
control in the NEUTRAL position and engage the park
brake.
FIG. 1:
m
WARNING: Never check for leaks in the
hydraulic system with your hands.
Hydraulic fluids under pressure can
cause cuts, burns, eye injuries or skin
irritations. Therefore never use your
hands for finding leaks in lines, always
use a piece of cardboard.
1. Check for leaks.
Inspect all oil, hoses and connections for damage
or for leaks.
NOTE: If oil can leak out of a fitting or a connection, air
can leak into the system. Air in the system can
be as bad as a low amount of oil.
2. Check the electrical system.
Inspect the harnesses, the electrical connectors
and the fuse(s) for the ECM. Refer to electrical
schematic.
With the engine start switch and the battery
disconnect switch in the OFF position. Check the
20 ampere fuse for the Electronic Control Module.
If the fuse is open, replace the fuse.
Inspect the electrical harnesses for damaged wires
or for broken wires. Disconnect each connector
and look for pins and socket that have been bent,
broken or removed. Look for any foreign material
inside the connectors. The connectors must be
tightened with normal force. The connectors must
be disconnected with the same amount of force.
FIG. 1
P000079