7A2-16 DIAGNOSIS (JR405E)
INTERMITTENT DIAGNOSIS
If the Tech 2 displays any codes as intermittent, or if after a test drive any codes does not reappear, the problem is
most likely a faulty electrical connection or loose wiring.
Terminals should always be the prime suspect.
Intermittent rarely occur in sophisticated electronic components such as the TCM.
When an intermittent problem is encountered, check suspect circuits for:
Poor terminal to wire connection.
Terminals not fully seated in the connector body.
Improperly formed or damaged terminals.
Loose, dirty or damaged terminals.
Any time you have an intermittent in more than one circuit, check whether the circuits share a common ground
connection.
Pinched or damaged wires.
Electric interference.
Check for improperly installed electrical options, such as light, radios, etc.
Use the F2: Snapshot mode of the Tech 2 to help isolate the cause of an intermittent fault. The snapshot mode will
record information before and after the problem occurs. Set the snapshot to "Trigger" on the suspected code or, if
you notice the reported symptom during test drive, trigger the snapshot manually.
After the snapshot has been triggered, command the Tech 2 to play back the flow of data recorded from each of the
various sensors. Sings of intermittent fault in a sensor circuit are a sudden unexplainable jump in data values out of
the normal range.
