What you can find there:
Recalls- important information about potential problems.
Diagnostic procedures- with electrical charts, diagrams, specifications, procedures, etc.
Repair manual - With the torque specifications, instructions, part numbers, diagrams, standard procedures, etc.
Check Engine Light codes - with description and troubleshooting procedure for a certain code.
Specifications - For example, fuel tank capacity, engine oil capacity, what type of fluid to use in automatic transmission or in the rear differential, all kind of mechanical specifications like compression, torque, oil pressure etc.
Diagrams
- electrical wiring diagram, car stereo connection diagrams, vacuum diagram, drive belt (serpentine belt) diagram, timing marks, etc.
Here are sample diagrams:
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 | Component locations - which shows you where is certain component located
Technical Service Bulletins - Bulletins issued by auto manufacturers that describe most common problems and the proper way to repair those problems for certain car models.
For example, Nissan Quest / Mercury Villager has common problem with EGR system causing the "Check Engine" light to come one. Nissan issued the bulletin that describes this problem and how to fix it. Once you read it, turns out that all needs to be replaced is small rubber hose two inches long called BPT valve bottom hose. Dealers may charge up to $200 to fix this problem.
There is also a lot more information like VIN information, description of acronyms used, conversion tables, how to reset "maintenance required" light, etc. Again, here is the link:
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Sell E-mail: 
: 390-936-511
: szhtech@hotmail.com
: szhtech1
: szhtech@yahoo.com 