7A-24 AUTOMATIC TRANSMISSION (AW30-40LE)
INTERMITTENT CONDITIONS
If the Tech2 displays a code as intermittent, or if after a test
drive a code 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 Transmission Control Module (TCM).
When an intermittent problem is encountered, check suspect
circuits for:
・Poor terminal to wire connection.
・Terminals not fully seated in the connector body (backed
out).
・Improperly formed or damaged terminals.
・Loose, dirty, or corroded ground connections.
HINT: Any time you have an intermittent in more than one
circuit, check whether the circuits share a common
ground connection.
・Pinched or damaged wires.
・Electro-Magnetic Interference (EMI)
HINT: Check that all wires are properly routed away from
coil, and generator. Also check for improperly
installed electrical options, such as lights, 2-way
radios, etc.
Use the F2: SNAPSHOT mode of the Tech2 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 suspect code (or codes) or, if
you notice the reported symptom during test drive, trigger the
snapshot manually.
After the snapshot has been triggered, command the Tech2 to
play back the flow of data recorded from each of the various
sensors. Signs of an intermittent fault in a sensor circuit are a
sudden unexplainable jump in data values out of the normal
range.