Advanced Automotive Fault Diagnosis

Pressure gauge
This is a standard type of gauge but with suitable
adapters for connection to a gearbox. Figure 10.10
shows where various tests can be carried out on
an automatic gearbox.
10.4.3 Test results
Some of the information you may have to get
from other sources such as data books or a work-
shop manual is listed in the following table.
Test carried out Information required
Stall test
Highest revs expected and the recommended
duration of the test
Kick down test Rev range in which the kick down should 
operate. For example, above a certain 
number of engine revs it may not be allowed 
to work
10.4.4 Automatic gearbox fault
diagnosis table 1
Symptom
Possible faults
Suggested action
Slip, rough 
There are numerous 
Check the obvious 
shifts, noisy 
faults that can 
such as fluid levels 
operation or 
cause these 
and condition.
no drive
symptoms
Carry out a stall test.
Refer to a specialist 
if necessary
10.4.5 Automatic gearbox fault
diagnosis table 2
Symptom
Possible cause
Fluid leaks
Gaskets or seals broken or worn
Dip stick tube seal
Oil cooler or pipes leaking
Discoloured and/
Low fluid level
or burnt smell 
Slipping clutches and/or brake 
to fluid
bands in the gearbox
Fluid requires changing
Gear selection 
Incorrect selector adjustment
fault
Low fluid level
Incorrect kick down cable 
adjustment
Load sensor fault (maybe vacuum 
pipe, etc.)
No kick down
Incorrect kick down cable adjustment
Kick down cable broken
Low fluid level
Engine will not 
Inhibitor switch adjustment incorrect
start or starts 
Faulty inhibitor switch
in gear
Incorrect selector adjustment
Transmission slip,
Low fluid level
no drive or poor 
Internal automatic gearbox faults 
quality shifts
often require the attention of a 
specialist

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