Seville STS V8-4.6L VIN 9 (1998)
Cellular Telephone Inoperative (Part 3 of 3)
Intermittents and Poor Connections
Intermittent failures in electronic systems may be very difficult to detect and accurately diagnose. The modules test for different malfunctions under
different vehicle conditions. For this reason, a thorough test drive is often needed in order to repeat a fault condition. If the system malfunction is not
repeated during the test drive, a good description of the complaint may be useful in locating an intermittent malfunction. Faulty wires or connections
cause most intermitting problems. When an intermitting condition is suspected, inspect the suspected circuits for the following conditions:
^
Poor mating of connector halves of backed out terminals
^
Improperly formed or damaged terminals
^
Wire chafing
^
Poor wire to terminal connections
^
Dirty or corroded terminals
^
Connector body damage
History DTCs are those indicating that the modules has previously detected a malfunction. The reason could be either that the malfunction is intermittent
or that the system for which the DTC is set for is not currently being operated. For example, the rear defogger circuit does not operate until the modules
detect engine RPM. For this reason, if a module displays history DTCs and the malfunction cannot be found easily, try clearing the DTCs and manually
