To the average driver, when the check-engine light blinks on, it's time to take your vehicle to the dealer. The minimum labor charge to check that pesky code is about $80-to diagnosis the problem. Today, however, you can save yourself some time and money with diagnostic tools that plug into the truck's on-board diagnostic control network. Now called OBD-II, all '96-and-later vehicles can use this diagnostic protocol. These tools range from simple, hand-held devices that display trouble codes, to large, computer-based units found at most repair shops. These tools can also function as a feature in a head unit or other accessory. As a bonus, these products have become an exciting and accurate way to measure your truck's performance. Here are some examples.
Laptop/PDA Software AutoTap is a software and hardware combination, which is commonly used with a PC or laptop, or a Palm PDA, to measure vehicle dynamics. The list of generic parameters for the AutoTap hardware and software kit includes: A/C system refrigerant, catalyst, EGR system and fuel system monitoring status, engine load, engine speed, ECT, ignition timing, MAF, O2 sensor-B1S1 to B2S4, oxygen sensor monitoring status, throttle position, as well as vehicle speed, to name a few off of the list. AutoTap displays text with a lot of data, multiple parameters, graphs, and gauges, plus multiple screen configurations with a combination of all displays in various colors, which are selected by the user. Plenty of file logging and playback, compiling information, and displaying data makes the AutoTap hardware and software kit for all OBD-II compliant vehicles a good scan tool. The cost is $199.95; check out www.autotap.com for more details.
Pros: It prints and saves, and the user can easily view readings in different formats.
Cons: Reading output on the laptop is awkward. The large device is potentially hazardous if not mounted while the truck is in motion.
Modular Format Magden's M.1 Performance Computer will connect directly to your truck's CAN-bus, interprets data in real time, and allows you to customize your display, to view the graphics or data streams. The computer's configurable display shows instant horsepower, torque, acceleration, and transmission gear. This unit helps to monitor fuel consumption and the truck's performance while towing. It is also able to record power runs and download them for viewing, and add as much as 11 analog and 4 digital sensor inputs. A built-in USB port makes transferring information simple. The M.1 is loaded with flexible and innovative features, while the touch-screen makes the unit easy to access all of the data, graphic themes, and units of measurement. Price is $799, viewable at www.magden.us.
Pros: It provides a variety of ways to view engine information, completely customizable screen colors and designs, and personalizing the display.
Cons: The Magden touch-screen monitor is sold separately, but integration with other touch-screen manufacturers is on the way.