Labrie EXPERT, Maintenance Manual, Page: 351 / 425

Troubleshooting
343
“PUMP: Trans Not OK”
Since the release of the Labrie multiplex diagnostic manual for the E
XPERT
™ (part #153142), a more
effective method for troubleshooting the failure mode identifier “ Pump: Trans not ok ” has been
identified.
The method outlined below can be used in conjunction with the Labrie multiplex diagnostic manual.
Only basic tools are needed for this troubleshooting: a quality multimeter (preferably used with back
probe leads), assorted screwdrivers, and a set of cutting pliers (for removing zip ties).
N
OTE
: Accurate diagnostic information will require use of the body serial number specific electrical
schematics. This ensures correct connection information as connector/wire numbers are
dependent on chassis manufacturer as well as whether a Labrie cab conversion has been
performed.
I
MPORTANT
:
Be sure to follow all appropriate lockout/tagout procedures (see Locking Out and Tagging Out the
Vehicle on page 14) as well as your standard shop/facility procedures before attempting this
procedure.
“ Pump: trans not ok ” indicates a breakdown in one of the two portions of the pump circuit.
Wire 104o originates at Node 10. When the pump switch is depressed, voltage is sent through wire
104o. Wire 104o is used to sense all safety features are met and terminates as an input into the
Transmission Control Module as “Pump Request Chassis”.
The 104 circuit acts as a request circuit to ask the chassis for a return signal after stating the body is
ready to allow pump engagement.
When the transmission parameters are met, a return signal via wire 149i sends voltage to two specific
locations. The first 149i runs to is Node 10 as input “Pump Running Chassis” and the second location
is spade location 1 of the pump relay.
A breakdown in either of these circuits will cause this error code to manifest.
It is important to note , specifically with wire 149i, the system may believe the pump is engaged but
due to a broken splice or other fault, the relay may not latch. This situation would prevent voltage
from passing through the relay to the dump valves/PTO, thus preventing hydraulic function even
though Node 10 is seeing power on wire 149i. This scenario would NOT result in a “ PUMP: TRANS
NOT OK ” code.
Step #1) With the engine running, attempt to engage the pump and verify the complaint. If the
display screen shows “PUMP: TRANS NOT OK”, continue to step #2.
Step #2) Cycle the key “OFF” and to the “ON” position only. Starting the engine is not necessary.