Join Date: Jun 2011
Location: Russian Federation
156 2.0TS MAF sensor - P0100 error investigation
I'm trying to cure the MAF issue here on a 2.0TS 156 built in 2000.
Currently I have three MAFs here. One original old BOSCH with 030 sensor, one almost new BOSCH with 044 sensor, one new Huco with god knows what inside it.
When using any of Bosches, engine failure light stays on all the way. With Huco, it shuts down, but so does the engine in 5-7 seconds after start. After restarting the engine, it works fine, and in 20 minutes the error is back.
Today I used FuatECUScan, measuring the newer bosch while driving home to work. The P0100 error persists, which is no surprise to me.
Measurements done by FES show that ECU receives 0,3 kg/h of air consumption after starting the engine, and through time it slowly increases to a 1,2 kg/h - that's reached in 35 minutes approx.
I can't see any dependance with anything - RPM, engine load, whatever. The only one curve that is similar to MAF primary one is the air temperatire sensor's.
So, I've a couple of questions:
1. I've heard faulty ECU can burn MAFs by sending inappropriate voltage. Is it true? What voltage is normal though?
2. Wires? Are there common places where MAF wiring corrode/wear?
3. May the resemblance of air temperature signal to volume sensor signal mean anything? (i.e. wrong wiring done by drunk mechanics)
4. Is there any ECU/MAF pinout reference available? I mean, pin assignments that I could check with tester for anomalities.
Andrew from Russia
P.S. Attaching graphs from FES, if they would have any use.