Ranger 4WD V6-3.0L VIN U (1997)
Running a diagnostic test may require the GEM to energize an output device. Some output devices might be limited to the amount of time that they
can be actuated. The tester can reactivate the device by exiting the diagnostic test and entering the test again. The GEM will not protect for enter/exit
condition of the tester.
During the tester-dependent diagnostics mode, the tester can only command the GEM to perform tests on disabled functions. A response is sent to the
tester if a diagnostic test request is made on a function that is not disabled.
The NGS can request the GEM to activate or deactivate an output device.
VEHICLE CONDITIONS FOR ON-DEMAND SELF TEST
During on-demand self-test the GEM disables all output functions.
On-demand self-test requires the following vehicle conditions:
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All doors are closed
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The ignition switch is in the RUN position
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The wiper control is in the OFF position and the wiper blades are parked
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The headlamps are off
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All the windows are in the up position
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All vehicle switches are deactivated
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The driver seat belt is not buckled Running a Diagnostic Control Test The tester controls the GEM by performing diagnostic tests. Diagnostic tests
are done only when the GEM has disabled the function being controlled. These control tests allow the tester to control the GEM's outputs and to
synchronize the GEM's inputs.
ON-DEMAND SELF TEST RESULTS
The results of the on-demand self-test is in the form of DTCs. The on-demand self-test DTCs are requested after the test has run.
The On-Demand Self Test detects faults within milliseconds as opposed to one second for the continuous fault code detection. The shorter period of
time reduces the overall test time and can help identify intermittent faults.
