A digital volt- ohmmeter is preferred over the older style analog multimeter for several reasons. A digital multimeter is necessary for checking fuel injection and emission related components (see illustration).In 1996 the government mandated OBD-II system became standard in nearly every car and truck and gave a much better indication of where and what the malfunction indicated was that had cause the check engine light to light on the dashboard. The system used in the 1988-1995 was very basic and could only provide clues as to what the malfunction was. The GMT-400 trucks and SUVs bridged the gap between the early days of computer controlled electronic fuel injection and the modern OBD-II era. This page is taken directly from our digital online manual 24065 for the 1988-98 Chevrolet and GMC C/K 1500/2500/3500 pickup trucks (including 1999-2000 C/K Classics), Chevy Tahoe, Blazer, and Suburban, and GMC Yukon, Yukon Denali, and Suburban, 2WD or 4WD with V6 or V8 gasoline engines, but it applies to many GM vehicles that use 4.3 liter V6, and 5.0 liter, 5.7 liter and other V8 motors. They feature everything you love about our books in an instantly accessible digital online form, that you can use via any device with an internet connection. All Haynes Digital Online Manuals are currently 50% off.
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