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-   -   How to tell if car is in FOM (Fixed Operating Mode) (http://www.peachparts.com/shopforum/tech-help/140600-how-tell-if-car-fom-fixed-operating-mode.html)

pentoman 12-22-2005 06:56 AM

How to tell if car is in FOM (Fixed Operating Mode)
 
the 190E 16v supplement engine manual http://mb.braingears.com/201_DISK1/PDF/40001a.pdf
talks of the CIS reverting to a fixed operating mode if any of the sensors stop working or short circuit etc.

It would seem to me like a good idea if there was a way of knowing that it was doing this...

Is there some obvious sign or test?

Russell

pentoman 12-22-2005 07:17 AM

I should add, this is a Euro 1990 16v without any lambda/O2 sensors or any of that malarky.. so I don't think I can measure the duty cycle :mad: .

Russell

mbdoc 12-22-2005 08:34 AM

The US 16V versions had FOM but no diagnostic ability!
Starting in 1988 either the duty cycle signal at pin 3 of the ROUND connector or pin 3 of the 8 pin diagnostic connector should provide that info!

autozen 12-22-2005 10:21 AM

Quote:

Originally Posted by pentoman
I should add, this is a Euro 1990 16v without any lambda/O2 sensors or any of that malarky.. so I don't think I can measure the duty cycle :mad: .

Russell

Russel,
I wouldn't call it malarky. Without Lambda control, you are driving a basic CIS system from the dark ages. Unless Bosch has produced an exotic system just for England, you are driving a car with 1976 technowledgy.:D


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