Major electrical problem, ECU & sensors related!! HELP!!

[nathan007]

Hey folks!

Just finished putting back my h23 in the accord, was going to calibrate TPS but noticed it had no voltage at all.. Checked other sensors, like MAP, no voltage..But battery voltage is good, car will crank no problem (didnt try to start it; cranked with fuel pump/IGN fuse out, to prime the engine)

Now, more details;
Originally was a f23a1, made little tweaks in wiring to run h23 obd2 ecu, everything ran fine. This season i had to modify the IAC to make it a 2 pin for obd1 conversion, and my intake manifold doesnt have an EGR valve so the connector is left unplugged. Other thank that, i did not change anything. I tried 3 ECU's, all with the same results, no power to sensors.

I'm doing some research on forums, my factory manual, trying to troubleshoot when i can find time, but if anybody would have a clue that would make my life easier, ler me know!!

 

[xci.ed6]

do you have power at the ecu?

 

[danmccormick87]

Ummmm, maybe I'm wrong completely but you said you are running your IACV as OBDI yet you are trying to run an OBDII ECU??? Wouldn't that cause a huge issue right there with your sensors, as the wiring is completely different and reads differently on the ECU. This might be a cause to your wiring issue, but I could be a complete donkey's a$$ and not know what I'm talking about

 

[bairdandrew77]

Did you do the 3 pin to 2 pin iac conversion right? And you said you changed some things to make the h23 obd2 ecu work, which is an automatic ecu. Did you make sure all the pins are in the right places for the obd1?

Sent from my ALCATEL ONE TOUCH 5020T using Tapatalk

 

[nathan007]

I will re-confirm everything tonight but if my memory serves correctly i was getting power to ecu but no ground/continuity. I need to re-check more sober for sure.

For the changes i made they were all obd2 related, the only major switch is the egr disconnect and IAC 3-to-2 wire conversion. I use a conversion harness for obd1 ecu, but even obd2 ecu will give same results.

The IAC connections i made was use yel/blk (+) to yel/blk (+) and black blu (- to ecu), i just taped off the black wire

 

[f20bcg3]

U should ground the black wire from iacv i did with mine if memory serves correct black blue is signal not (-)

F20Bs don't take prisoners they chop faces off!!

 

[nathan007]

well a little update, and it will sound stupid.. i plugged back my fuel pump and ignition fuses and everything is good! Got voltage to sensors!!

 

[f20bcg3]

Glad u got it up and runnin

F20Bs don't take prisoners they chop faces off!!