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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

DTC B0039
07/10/2020 in the Technical Theory Forum
I need help about the naming of DTC B0039. In the J2012 the naming is: "Second row right front stage 1 deployment control (sub fault). I think it is related to air bag but I would like to have a more simple description. Also, what is the meaning of "sub f...
The humble carburettor main jet
07/08/2020 in the Technical Theory Forum
G'day iATM, I was going through some very old paper work the other day and I came across some of my notes when I was involved with apprentice training, anyway I thought I would post this question. Please "do" over think this question. What does the main j...
Alternator and Magnets
07/07/2020 in the Technical Theory Forum
Recently had a customer with a 2003 Ford E350 come in with a failed alternator. Found a blue-point magnet light on it (Score!), from another shop. I'm wondering if there is any evidence that the magnet of this light riding on the alternator's case, for wh...
adding toggle switch to this relay
07/06/2020 in the Technical Theory Forum
I want to add a small toggle switch to disable this injection pump relay on trigger pins 86 or 85. Pin 86 comes from ECM that is 12v switched. Pin 85 goes to constant ground. If I put a switch on 85, is it possible that the 12v will try to find a ground w...
News DTCs
07/02/2020 in the Technical Theory Forum
I would like to find some article about the new 7 digits DTCs. I`m more than 2 years out of OBDII issues and received a mail of a technician that had some doubts about "7 digits DTCs". He put the exemple of DTCs of a new VW Virtus: P0266-00 and P0266-01 T...

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