Hallo to everybody !
I swapped my 870-ECM for a 165-ECM, did the right wiring and now I get always code 36 ( MAF-burnoff-circuit ). After shutting the engine off, a few seconds later the MAF-Burnoff-Relay engages, there is 12V at MAF-Sensor PIN-D and Pin-E, but only for 1 second ( or even shorter ).
I did some more tests : PIN B12 at ECM ( MAF Sensor Input ) with Key on, Engine Off : 4,6 Volts ( ist this okay ? ). I manually grounded PIN D12 ( Burn-Off Relay Control ) : 12 Volts at Pin D and E at the MAF-Sensor, I can see the wire glowing, but at the ECM at PIN B12 there is 0 Volt ( shouldn´t there be 5 Volt to make the ECM "see" the successful burnoff-cycle ? ). Do I have a bad MAF-Sensor or a bad ECM ? I never had a code-36 with my old ECM. What else can I check ?
Thanks, Uwe

 

Here are a couple of links I found on the TPI board about MAF 36 DTC. I'm not sure how the ECM detects the burnoff cycle.

https://www.thirdgen.org/techbb2/sho...ht=MAF+burnoff
https://www.thirdgen.org/techbb2/sho...ht=MAF+burnoff
https://www.thirdgen.org/techbb2/sho...ht=MAF+burnoff

RBob.