Ranger 2WD V6-182 3.0L (1995)
GEM Parameter Identification Display Part 2 Of 2
Retrieving Diagnostic Trouble Codes (DTC)
The GEM monitors the system during normal operation and reports concerns in the form of diagnostic trouble codes (DTCs). The DTCs can be retrieved
with the NGS Tester through the communication link.
Using Rotunda New Generation Star (NGS) Tester
Description
The Rotunda New Generation Star (NGS) Tester is a menu-driven device that allows specific diagnostic testing and DTC retrieval.
Interface
The NGS Tester communicates to the GEM through the ISO-9141 data link connector. The connector is located in the passenger compartment on
the driver's side under the steering column.
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's seatbelt is not buckled
Generic Electronic Module (GEM) Diagnostic Strategy
