Category Archives: Computer Diagnostics

Pre Purchase Inspection of Used Vehicles

vehicle-history-check pre-purchase inspection

Buying a used car is a great way to save money. However, before you make a used car purchase, it is important to know that the vehicle is safe and is not in need of major and costly repairs. By getting a used car inspection you can have a much stronger sense of the shape of your potential used car.

What a Used Car Inspection Should Cover

A thorough check-up examines mechanical, safety, and appearance aspects, such as the vehicle’s:

  • Tires.
  • Frame.
  • Suspension.
  • Glass.
  • Lights.
  • Brakes.
  • Radiator.
  • Hoses.
  • Belts.
  • Fluids.
  • Battery.
  • Body condition.
  • Exterior surface.


The best inspections include a road test and a computerized engine analysis. Some comprehensive examinations also evaluate the condition of the instrument controls, pedals, seats, and sound system.


vehicle-history-check pre-purchase inspection


 Get a Vehicle History Report

Vehicle inspection reports are inexpensive and contain a wealth of information about the used car you’re considering. The most important information you’ll find in any report is

  • Registration records – Know if the used vehicle was imported from out of state (or country). Most importantly, find out immediately if the car is stolen. (Obviously unlikely, but important to know!)
  • Vehicle title / branding (major accidents) – Know whether the car has been in a major accident. At the very least, you should take this into account when considering the purchase price. Also be aware that even if the car has been fully repaired, there may be lingering effects down the road, and its eventual resale value will be impacted as well. Inspection is even more critical in this case!
  • Liens – How would you like to have your new car repossessed to cover the previous owner’s bad debts? If that doesn’t sound like fun, all the more reason to get a history report on the used car you’re considering.

Computer Diagnostics for Your Vehicle is a Vital Service

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When an auto repair shop recommends a ‘computer diagnosis’ it sounds serious, and everyone knows that serious vehicle problems can lead to serious repair bills. However, AAA experts advise consumers not to be overly concerned because computer diagnosis is a common practice for identifying problems on today’s microprocessor-controlled cars.



“If your vehicle needs a computer diagnosis, don’t be alarmed. This is often the most efficient and cost effective way for an automotive technician to diagnose a problem,” says John Nielsen, director, AAA Automotive Engineering and Repair. “Just be sure to have the repair facility explain what will be done before you authorize the work because ‘computer diagnosis’ is a generic term that can cover a wide range of operations.”


  • Modern vehicle electronic control systems “know” and monitor the operating parameters of every component. When the Powertrain Control Module (PCM) that manages the system sees a signal that is outside normal limits, or fails to see an expected change in a signal, it stores a Diagnostic Trouble Code (DTC).


  • To access DTCs, technicians connect a “scan” tool to a Diagnostic Link Connector that is commonly located under the driver’s side of the instrument panel. The scan tool displays any stored codes, but that is only the beginning of a full computer diagnosis.

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  • DTCs don’t tell a technician if a particular part is bad, they only indicate that the PCM has seen something it didn’t expect in a certain circuit. The problem might be the part, but it could just as easily be an issue with the circuit’s electrical wiring.


  • Sometimes, DTCs are set when there is nothing wrong with the electronic control system. This happens when a mechanical problem, like an engine vacuum leak, creates operating conditions that cause system components to generate signals outside their normal range.

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  • To pinpoint a problem, the technician starts with the DTC, then performs additional tests. These can range from mechanical checks, like engine compression, to in-depth electronic diagnosis. One common procedure uses special test equipment to access the electronic control system data network and monitor real-time signals from the system components.


The ability of technicians to determine what additional tests are needed, and to accurately interpret both test results and computer network data, comes from extensive training and experience. Today’s technicians use vehicle computer diagnosis in much the same way surgeons employ medical testing. In both cases, combining test results with expert knowledge and skilled hands can lead to an accurate diagnosis and an ultimate cure.



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