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DIAGNOSTIC
PROCEDURE
What to do when you receive a defective automatic
transmission.
1. Reception of vehicle - ask customer about
complaint noted.
2. Prepare the repair order but do not enter work
to be performed; only the vehicle road test.
3. Prepare the vehicle for a road test and check
the level and condition
of the transmission
fluid:
- if the fluid level is OK and fluid does not look
dark or smell burned, proceed to step 5.
- if fluid level is OK but looks dark or smells
burned, proceed to step 4.
- if fluid level is low but fluid looks and smells
OK, fill fluid and proceed to step 5.
- if fluid level is low and fluid looks dark and
smells burned, proceed to step 4.
4. If the fluid appears dark or smells burned, the
problem is mechanical. Connect the XR25tester
and attach oil pressure gauge B.Vi 466-07 then
proceed to road test, step 5.
5. Test the vehicle on the road until the complaint
recurs. At the end of the road test, the person
performing
the test must prepare a precise
diagnosis of the failure
using the necessary
documents (repair manual, diagnostic section)
and according to the information
supplied by
the various testing
means and observations
noted.
6. Depending on the diagnosis made, complete
the
repair
order
indicating
the
vehicle
component causing the problem. Never begin
repairs if the diagnostic sequence has not been
performed.
7. Perform the necessary repairs.
8. After repairing the vehicle, perform a road test
to make sure that all complaints have been
corrected.
REMEMBER: The transmission warning light comes
on only if there is an electrical problem or there is
interference
in the engine
compartment
(faulty
connections or high voltage leaks).
CAUTION
All electronic systems operate at very low voltages
and current intensities (millivolts
and milli-amps).
The supply voltages and grounds must be absolutely
accurate. A voltmeter/ohmmeter
must be used to
check:
- the grounds •
- the power supply +
- the connectors
Test bulbs should never be used for checking system~
containing electronic components.
F2-2
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Table of Contents
Troubleshooting
