Mitsubishi 3000GT Service Manual page 14

GENERAL
HOW TO COPE WITH INTERMITTENT MALFUNCTIONS
Most intermittent malfunctions occur under certain conditions. If those conditions can be identified, the
cause will be easier to find.
TO COPE WITH INTERMIITENT MALFUNCTION;
1. Ask the customer about the malfunction
Ask what it feels like, what it sounds like, etc.
Then ask about driving conditions, weather,
frequency of occurrence, and so on.
2. Determine the conditions from the custom-
er's responses
Typically, almost all intermittent malfunctions
occur from conditions like vibration, tempera-
ture and/or moisture change, poor connections.
From the customer's replies, it should be rea-
soned which condition is influenced.
3. Use simulation test
In the cases of vibration or poor connections,
use the simulation tests below to attempt to
SIMULATION TESTS
For these simulation tests, shake, then gently bend, pull,
and twist the wiring of each of these examples to duplicate
the intermittent malfunction.
Shake the connector up-and-down, and right-and-left.
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Shake the wiring harness up-and-down, and right-and-left.
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Vibrate the part or sensor.
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NOTE
In case of difficulty in finding the cause of the intermittent
malfunction, the data recorder function in the scan tool (MUT-II)
is effective.
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TSB Revision
Service Point
duplicate the customer's complaint. Determine
the most likely circuit(s) and perform the simula-
tion tests on the connectors and parts of that
circuit(s). Be sure to use the inspection proce-
dures provided for diagnostic trouble codes
and trouble symptoms.
For temperature and/or moisture conditions re-
lated intermittent malfunctions, using common
sense, try to change the conditions of the sus-
pected circuit components, then use the simula-
tion tests below.
4. Verify the intermittent malfunction is elimi-
nated
Repair the malfunctioning part and try to dupli-
tent malfunction has been eliminated.