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Intermittent malfunctions often
occur under certain conditions, and if these conditions
can be ascertained, determining the cause becomes simple. In
order to ascertain the conditions under
which an intermittent malfunction occurs, first ask the
customer for details about the driving
conditions, weather conditions, frequency of occurrence and
trouble symptoms, and then try to
recreate the trouble symptoms. Next, ascertain whether the
reason why the trouble symptom occurred
under these conditions is due to vibration, temperature or
some other factor. If vibration is
thought to be the cause, carry out the following checks with
the connectors and components to confirm
whether the trouble symptom occurs. The objects to be
checked are connectors and components
which are indicated by inspection procedures or given as
probable causes (which generates diagnosis
codes or trouble symptoms).
- Gently shake the connector up, down and to the left
and right.
- Gently shake the wiring harness up, down and to the
left and right.
- Gently rock each sensor and relay, etc. by
hand.
- Gently shake the wiring harness at suspensions and
other moving parts.
note |
If determining the cause is
difficult, the drive recorder function of the
M.U.T.-III can
also be used. (For details on how to use the
M.U.T.-III, refer to the "M.U.T.-III
Owner’s
manual).
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