Codes 1550, 1509, 1140

[noga]

Ive been having idle problems for almost a year now, I changed my ICV today and it didnt seem to help. Idle is bouncing from 900-1250. These three codes popped when I had the mechanic check, any ideas?

p1550
p1509
p1140

Thanks for the help in advance

[noga]

Also if someone could post a pic of where the MAF is located, I found out that 1140 has something to do with the MAF so im going to attempt to clean it.

[BMW_Hatchback]

check my build thread for the p1140 i think

[familytruckster]

The maf is the sensor mounted on the air filter housing.

P1140 Mass or Volume Air Flow Circuit Range/Performance Problem
P1509 Idle Speed Control Valve Opening Solenoid Control Circuit Electrial
P1550 Idle Speed Control valve Closing Solenoid Control Circuit Electrical

Sounds like a wiring problem for the ISC valve.
The 1140 could be a vacuum leak. Check the intake boot and all the vacuum lines on the intake.

[noga]

How do I check if the wiring is faulty?

[graymae]

I had the p1140 code that i fixed this years also. mine was caused by a vacuum leak between the upper and lower intake manifold, had to take it a part and rtv the gaskets to seal it up. code went right away when i was done.