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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

04/01/2020 in the Technical Theory Forum
[Driveability: 11 Toyota Camry SE 3.5L] OK, so this should be relatively simple, right? The signal comes from the ABS/Skid Control Module, and is sent to the cluster. From there, it is shared with a bunch of other modules that need a VSS signal. No speed...
Different Names for the Same Thing!
03/24/2020 in the Technical Theory Forum
I think a big part of the learning curve for unfamiliar systems is the terminology for modules. There can be four of five different OEM specific names for the same thing. Typically there is a short codename used on schematics, a full module name, an acron...
Helicoil aluminum advice
03/23/2020 in the Technical Theory Forum
2013 Chrysler charger, rear caliper bracket bolts thread into aluminum knucke. I was going to healicoil, but not sure how well they hold up with aluminum.
FJDS 117.01 keeps erasing PCM's, erroring, Leaves PCM dead!
03/18/2020 in the Technical Theory Forum
[Electrical: 05 Ford Excursion Eddie Bauer 6.0L] I've tried reprogramming 3 different PCM's with FJDS 117.01. I called Rotunda and they said the 117.02 is having issues. The unit's i've tried are: 2003 Lincoln Aviator 2003 Lincoln Aviator 2005 Excursion ...
CCD Bus testing
03/17/2020 in the Technical Theory Forum
[Electrical: 97 Jeep Wrangler SE 2.5L] I have a technical question, where does the CCD Bus voltage come from the 2.5 volts ? I think its the PCM but I am unclear and service info in pro demand is limited. I have no gauge in the MIC and No response to Air...

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