87 camaro TPI code 33.. ecm ? - Third Generation F-Body Message Boards

code red · 06-26-2009, 01:02 PM

After doing A LOT of searching on this site... i found a lot of helpful information regarding code 33.... Used MAF cleaner spray...i checked MAF power, Burn-off, and Fuel pump relays- they're good.... on the harness that goes into the MAF sensor A&B- test light on... D (ignition on-engine not running)- zero volts... C (ignition on engine not running)- 1.1 volts so i checked the B12 on the ecm- got 1.1v

Then i cleared the code and checked MAF harness C- 1.1v and the same at B12 (ecm)... Started the car: B12(ecm)- 3.42v..... let the car warm up to operating temp.. got 3.58v at B12(ecm).. reved the motor at 500 increments upto 2500rpm when down to 3.40v.

is there anything else i should check, maybe the TPS ? Or is my ECM on the way out ?

Thanks, Dan

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400Z28Racer · 06-26-2009, 05:09 PM

maybe this will help
http://www.thirdgen.org/techboard/po...92-post11.html

code red · 06-26-2009, 05:19 PM

thats one of the charts that i used that led me to the ecm... i read on a wiring diagram of the ecm- 2.5 with key on and i believe its 4.1 with engine running... as you rev the engine are the volts suppose to increase or decrease...

ftp://ftp.diy-efi.org/pub/gmecm/manu...165v8tpi-6.jpg

code red · 06-27-2009, 11:59 AM

i tested the B12 (dark green) wire to the MAF harness (c) and got .5 ohms with meter set on 200....trying to search online to see if that is high or low..would this mean an open circuit ?