Code 2221 ('90 200TQ)

[Eyvind Spangen]

I get a code 2221 all the time on my '90 200TQ. I don't have to drive
the car - only start the engine, and the 2221 will be there. The boost
gauge in the dash will indicate 0.7 bar with ignition on. Like someone
said, I suspect that somebody has been fooling with the ECU and
installing some sort of "limiter", as the gauge never comes above 1.5
bar, even if I apply 2.0 absolute pressure (1.0 bar relative) with
pressurized air. I even tried running a known-good hose from the IM
connection thru the open window into the ECU hose connection, it made
no difference. Looks like the ECU is tricked with to remove the 1.6
bar cutout..

I thought that something "wrong" with the ECU pressure sensor would
give a 2222, but it doesn't look like this.. I'm thinking of leaving
the ECU to get this fixed & get a "real" performance chip installed..

-- 
Regards,
ES