Explorer 2WD V6-245 4.0L SOHC VIN E EFI (1997)
Generic Electronic Module (GEM) Controlled Functions
The Generic Electronic Module (GEM) is equipped on four-wheel drive vehicles with power windows. The Central Timing Modules (CTMs) are
equipped only on the two-wheel drive vehicles without power windows.
NOTE: GEM diagnostics are compatible with the New Generation STAR (NGS) Tester. CTM diagnostics are not.
The GEM incorporates the functions of several different modules into one and offers diagnostics to easily locate and repair concerns affecting the
subsystems that it controls.
The GEM constantly monitors the systems under its control and reports a concern in the form of Diagnostic Trouble Codes (DTCs). A DTC can
be retrieved with the NGS Tester through the communication link.
The NGS is a menu-driven tester, allowing the user to run specific tests. The NGS can isolate faults in the GEM subsystems through a
symptom-driven diagnostic procedure. Connecting the tester to the GEM communication link will not alert the GEM. If the GEM is "asleep" when
the diagnostic connector is plugged in, the GEM must be "awakened". If the communication link cannot be established, it is advised to turn the
ignition to RUN.
NOTE: The GEM has a sleep function to minimize battery consumption. During the sleep mode, the GEM turns off all outputs and monitors only
the following:
