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3/2/19 - Hooked on ScanGauge D


This is an overdue tech post about my personal addiction to the ScanGauge D Computer. D is for Diesel, and I can't imagine operating a diesel-powered coach (or big rig) without one.

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While this well-thought-out computer/monitor (shown above at engine idle) will display a whole host of engine operating parameters (AKA gauges), my usage falls into two main categories:

I. Realtime Engine Performance Feedback

I typically monitor mileage (MPG), Boost (BST), road speed (MPH), and horsepower output (HPR). MPG: Instant feedback on the relative economy of my driving habits as well as the fuel load the terrain is placing on the engine.BST: How well my exhaust turbo is feeding air to the engine (I'm still learning the ins and outs of managing boost for various driving conditions).HPR: How much power the Cummins ISB is putting out under current conditions.MPH: One may wonder why I watch road speed using the digital ScanGauge when I have a perfectly good speedo. One word: accuracy. The same could also be said for ScanGauge tach display (RPM), which I use on occassion. II. Checking/Clearing ECM Fault Codes

My Cummins Engine Control Module is constantly monitoring all the engine systems and will log any faults it detects during operation. (Click here to see a list of standard ECM Fault Codes for all Cummins engines.)

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Fortunately, engine faults do not occur very often, but when these do happen, the ScanGauge D allows me to examine those codes. Why? If not for any other reason, I can have a more informed conversation with my diesel service technician. I can also use the ScanGauge D to clear any fault codes that have been logged to check for reoccurrence. (Of course, checking/clearing fault codes should only be performed when parked.)

ScanGauge installation is simple. Just plug the monitor into your engine diagnostic port; it's usually found under the dash. In modern over the road diesels, the port will accept one of the plugs shown below:

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Power is provided to the monitor by the diagnostic port itself, and it can be left permanently plugged in. As shown above, I mounted my ScanGauge D to the driver's side window using an optional suction mount kit, and it stays put.

Manufacturer support is very good. When I first got the ScanGauge D, I experienced a rolling display whenever I plugged it in. The problem was instantly diagnosed over the phone, and I was given a DIY solution that fixed it. (I had a stuck button on my monitor that was causing the display to roll.) I was told that trying the DIY fix was my choice, and either way I could return the monitor for warrantee service. I've had no problems since.

Among other functions, the ScanGauge D also can provide multi-leg trip statistics, fuel usage monitoring and cost tracking, and it can even be custom programmed to your ECM for non-standard gauge display using user-defined query parameters. I'm leaving a lot of functionality out here; in fact, there's a lot more there than I will ever use, but I'm happy.

And I'm hopelessly hooked.

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ScanGauge D Computer

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