Control Pressure (Warm-Up) Regulator question

[Huw Powell]

> Trying to assess whether or not my Warm Up Regulator is electrically 
> out of spec or not, or do I have to do the fuel system pressure checks:
> 
> Patient, '89 200Q, MC2
> 
> Bentley says that the temp sensor check value is "approximately 14 - 22
> ohms"

Except for the above line I followed everything you said here.

The CPR (or WUR) electrical circuit is just a heater, and it runs all 
the time (as I recall).  About the only thing it can do wrong is short 
or open.  Even if it is dead, the block will heat the WUR, but slower 
than the heater will (similar in concept to heated OXS, sort of)

The temp of the WUR "block" then alters the control pressure via a 
bimetallic doohickey to provide cold engine enrichment.  I think your 
car uses more sophisticated systems as well in this stage than the old 
CIS did.

> Checking temperature range 68 to 86 degrees F (20 - 30 C), although I
> don't 
> really think that this applies directly to the resistance measurement
> range, it's 
> part of the output test section of testing the unit. 
> 
> At 75 degrees F (22.5 C), the unit resistance checks at 12.3 ohms.

-- 
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/