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3. Intermittent Faults
• An intermittent fault typically occurs only under certain operating
conditions. Once these conditions have been identified, the
cause of the intermittent fault can be ascertained easily. First,
ask the customer about the vehicle operating conditions and
weather conditions under which the fault occurs. Also ask about
the frequency with which the fault occurs and about the fault
symptoms. Then, reproduce the fault based on this information.
In accordance with the conditions under which the fault occurs,
determine whether the fault is caused by vibration, heat or other
factors. if vibration is a possible factor, see if the fault can be re-
produced by performing the following checks on individual con-
nectors and other parts:
• Gently move connectors up and down and to left and right.
• Gently move wiring harnesses up and down and to left and
right.
• Gently wiggle sensors and other devices by hand.
• Gently wiggle wiring harnesses on suspension systems and
other moving parts.
• Connectors and other parts to be checked are those included or
given as likely fault locations in inspection procedures corre-
sponding to diagnosis codes and/or fault symptoms.
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