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International Automotive Technicians Network

Automotive Technical Theory Forum

Professional automotive forum for discussion of the theory of operation for any automotive system or component. Discussions include electrical and electronic theory, engine propulsion theory, fuel system theory, ignition systems theory, and much more. This forum is for experienced automotive repair professionals only, membership required.

Continue to the description of our next automotive discussion forum, the Technical Tips Forum.

Recent Automotive Discussions in the Automotive Technical Theory Forum

2001 Silverado 5.3 Secondary Air Injection Check Valves
09/24/2018 in the Technical Theory Forum
Every 2 or 3 years, the check valve blows out and trips a code. I think the last two times it\'s been on Bank 1, but before that it may have been Bank 2. The valves are rusting inside, and I thought it may have been from around town driving and moist...
J2534 Question
09/19/2018 in the Technical Theory Forum
Hello iATN techs, Updating and researching J2534 info and would appreciate input regarding whether or not a TSB is required in all cases before updating/reprogramming a PCM. From 1995 to 2003 (ancient history I know) GM-AC Delco quote: 70% of 95-to-03 veh...
Schaeffler Group variable valve timing
09/18/2018 in the Technical Theory Forum
Dumb CAN question (be gentile)
09/12/2018 in the Technical Theory Forum
Lets say we have a CAN J1939 system with multiple modules. Power on we have 2.7H and 2.3L. Power off as in battery disconnected we have 60 ohms at our diagnostic plug. Now we unhook all the modules. Recheck ohms, still 60. Restore power. With no modules c...
Fuel pump inrush current/TIPM
09/12/2018 in the Technical Theory Forum
[Driveability: 12 Dodge Grand Caravan Crew 3.6L] Van came in as a no start, battery very low. Charged battery and van started, let run a few minutes, then shut down. Let it sit an hour and restarted. Suspected low voltage( as all modules reported same) s...

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