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Toward a Better Computing Experience |
Bob Elgines, Editor, Colorado River Computer Club, AZ, Elginesz(at)rraz.net, www.ccrc.org |
Is
your Engine Check light on? Do you need a smog test? Is your engine running
rough? Is your transmission shifting improperly? Did you know you can read your
automobile computer results with a simple plug in device?
All autos from 1996 and newer have common plugs and codes mandated by the
Federal Government. Some late 1995 models are also equipped with this type of
computer and will have on the label under the hood “OBD II” listed. Prior to
1995 some Engine Check Lights in the car were on timers or mileage meter, and
would come on after 50,000 miles and really had nothing to do with the operation
of the engine or computer.
“OBD II” is the model of your Powertrain Control Module (PCM) -- terminology for the on-board automobile computer that controls engine and drive train. Some automobile models will use more sensors and controlling devices than others. There are Continuous Monitors, such as Misfire, Fuel System, and Comprehensive Components, and Non-Continuous Monitors, such as EGR System, O2 Sensors, Catalyst, Evap System, Secondary Air, and A/C Systems.
New car dealers charge you $100 to plug their reader in called a diagnostic test, and guess at what to replace. An example is EVAP codes can appear for several things such as leaky hoses, gas cap, EVAP solenoid, EVAP pump, etc. All these have to do with the evaporation of fuel from your gas tank. They will replace them one at a time charging you labor and diagnostic charges for each item, that can be $200 plus parts for each replacement.
Simple code readers start at $40 at Harbor Freight. The next model up costs $80 to $90 and the difference is more readings, memory and allows updates via the web (there have not been any updates since 1999). Top models will cost $200 to $250, but allow you to plug the results into your computer via a USB connector giving you much more information and possibly allowing some adjustments.
Most Data Link Connectors (16 pin) are under the dash just left of the steering wheel. Below is a basic definition of how to understand the codes that you will read. There are at this time 7000 different codes with several being for Diesel engines only. You have Generic Codes and special Manufacture Codes.
Below is an example of a readout on a PC of the more expensive model readers.
This article has been provided to APCUG by the author solely for publication by APCUG member groups. All other uses require the permission of the author (see e-mail address above).