What is DTC?
Computerized engine control systems have a certain amount of built-in self-diagnostic capability to detect problems that affect engine performance and emissions. The same is true for the antilock brake system and other onboard systems that are computer controlled.
Related Terms: OBD-II
When a fault is detected, the computer will store a diagnostic trouble code in its memory and illuminate the "Check Engine" light. On some vehicles, the computer can be put into a special diagnostic mode by grounding certain terminals on a diagnostic connector. This will cause the Check Engine or other lights to flash out the fault code. On many vehicles, though, a scan tool must be plugged into the computer system to access and read the codes.
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Date: 7/17/10 Source: amazon.com Unit: RDT40 Name: Sau |
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| Comment: This is the first time I have used a code reader. Instruction in the manual is clear and the reader is easy to use. You don't have to be a mechanic to use this tool. I was able to clear the error codes on my Toyota Corolla and my Mazda MPV. It was an excellent deal for $35 w/o tax & free shipping. | ||
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Date: 7/01/10 Source: amazon.com Unit: RDT55 Name: Gourd |
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| Comment: I can't say enough positive things about this device. If you own a modern Volkswagen or Audi, many of the codes and engine diagnostic data packets can only be read by a device such as this, or through a system called VAG COM. A VAG COM reader would produce far more detailed information, but is more expensive than this device. This is an excellent alternative for those like me who feel comfortable doing minor maintenance and repair on their car, but feel most comfortable taking more difficult repairs to the dealer or mechanic. As many dealerships, such as the ones near by me, CHARGE a diagnostic fee just to read codes, this can save you money in the long run. In my particular case I as able to determine that I had a bad battery, figure out which chambers were misfiring and replace the coilpacks on them, and read the upper and lower range of voltage on an oxygen sensor that appeared to be defective. Build quality is good, and using the device is very simple. It also comes with a decent tote bag. The device can be updated through use of a USB cable, but I haven't had the need to attempt this yet. | ||
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Date: 6/29/10 Source: amazon.com Unit: RDT45 Name: Fly Fisher |
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| Comment: Needed to check ABS fault in 1997 VW. Worked exactly as described. Found faulty RF wheel speed sensor and ordered new one from AutohausAZ. Well worth the investment. | ||
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Date: 6/08/10 Source: amazon.com Unit: RDT40 Name: Guy Ashdown |
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| Comment: DOES EXACTLY WHAT IT SHOULD!! Tells you codes, emission readiness,resets check engine light, this thing is great ....period!!! dont spend a wad until you try this one!!! dont be fooled by those auto parts stores who check your codes for free!!! they dont erase codes all the time!! there just like a shop...looking to make money!!!DO IT YOURSELF AND SAVE MONEY!!!DID YOU KNOW YOU CAN MAKE A LIGHT COME ON BY PLUGING IN FAULTY CODE READERS? EMISSION PLACES DO IT ALL THE TIME!! BE PREPARED!!!HELP YOUR SELF!!! IF NOT THIS ONE, GET ONE PERIOD!!! | ||