I have an 88 crx si and i have a b16a. I have been trying to figure out why my crx is still not turning over. Well I think I have managed to narrow it down. Let me know what your thoughts are...

So the car is not getting any fuel through the lines but also the led light will not turn on at all on the ecu. On top of that there is no clicks coming from the main relay and i have resoldered the connections and also attempted to use an extra relay I had lying around...nothing. Im almost positive is not a fried ecu as well bc number 1 it is not that old (its a skunk2) and when i plug in the stock si ecu no light turns on as well. Also my fuses seem to be up to par.

My grounds seem to be correct...I havent done a complete overall but when I installed the new harness I made sure everything was correct and tight...

So as I was researching I found out that there are circumstances where the ecu will not respond at all during attempts to start due to a bad fuel pump. How true is this? Do you think this is the main problem why nothing else is responding including the relay and ecu? The car has not ran since 98

I will be removing the gas tank some time next week to test this theory...I am going to plug the pump into auxiliary power and see if anything happens

I am not trying to throw down 100 bucks for a new fuel pump but this may be the answer i was looking for...let me know

 

Check fuse #14 under the dash.. Labeled alternator/solenoid
It provides power to the main relay..



Fuse #14 controls the following:
Voltage regulator
Emission control solenoid valves
PGM-FI main relay
PGM-FI ECU
Fuel Pump
ELD unit
EACV

 

I had a test light and 14 was fine...I will get another fuse just to be safe.

Any other ideas?

 

I've been trying to piece together whatever i can from the service manual for the 88...heres what my steps are right now:

If you have a copy of it you can follow me

1. 6-80 main relay harness test (im getting my hands on a multimeter and im going to make sure everything is getting 12v)--also my cel stays on as well as my oil light when the car is on the on position...sometimes as well my damn e-brake light flickers along with another light that just slipped my mind. Sometimes those two stay on sometimes they dont (my ebrake is always on)
2. 6-79 main relay test
3. 6-78 fuel pump connector- i am having trouble figuring out where the location is for this...is the connector in the fuel tank with the pump or is it the same as the fuel gauge sending unit...my fuel gauge sending unit is getting power but my tester was a little dim...most likely my ground

right now bc of the ecu problems i think there is something wrong with the harness somewhere...might be a ground which will make me flip ****...i am going to check my starter ground when i have a chance and i will also get some additional fuses to replace the ones in the bay fuse box...my test light said they were all getting power...so i think this is all bc of a ground and on top of that maybe my fuel pump.

My heater/radio/ac wires are exposed at the copper bc i have none of those things right now i should end cap them but it shouldnt be a problem at least i dont think so

So if 12v doesnt come up on fuse 14 i will need to just run through that fuse and maybe replace cable. I will be working on the car on tuesday again so i will just have to go through all of my grounds listed in the manual and make sure they are tight as hell

 

https://honda-tech.com/forums/honda-crx-ef-civic-1988-1991-3/trying-start-my-90-honda-crx-si-help-2452457/

Here is my thread when I was having problems. maybe it will give you some ideas?

 

so question then...my ecu led wouldnt even blink once even when i turn the key to the on position...the ecu isnt bad bc I used a stock ecu and still nothing.

I came across the fuel pump effecting the main relay as well as the ecu on other sites i had searched...when I turn on the car i hear no main relay either and naturally the fuel pump doesnt do anything. I need to check and see if my fuel pump is getting power...last time i was at the car i screwed up and tested the fuel gauge sending unit not realizing the fuel pump 3p connector was farther back. My guestimation is that if it is getting power then its my fuel pump...if not its the main relay harness

 

Here is the wiring diagrams if you do not have them already. I think your ecu is fine.

Check fuse 37 (15A) (could be in the engine bay area) even though thats not linked up to the fuel pump it could prevent your engine from turning over. and then fuse 2 is for your starter signal. you said this one is fine as well. I would probably pull the main relay and check everything there with your tester. but like you said if you have power to your fuel pump then the relay should be fine if not then the fuel pump should be fine. (well thats my thinking)

 

I think your main relay is bad to come to think of it. I would switch it out with a spare and see what happens.

 

Thanks for trying to help me piece this headache together...

I had a spare main relay and plugged it in...still nothing. I also resoldered the connections on one of them...still nothing

I checked the fuses last time i was at the car but i need to see if the fuel pump is getting power. Like we both agree if the fuel pump is not getting power then its the main relay. I think my relay is fine and the problem lies in its harness. Im going to get a tester and test those connections. Im kindof hoping thats my problem...it is most likely that my grounds are not proper in areas. I need to finish soldering the loose wires to something and end cap the ones I cant. I will definitely retest those fuses tho

 

so it turned out that its my dash harness that was the problem...not all of the pins on the main relay were getting power...actually only one was. Soo I was right...yay!??...no yay...

After I tested the harness I decided to go reach under the dash to see if any connectors were loose....then hell broke loose. i moved the fuse box to the side and kablamo...every single light on the gauge cluster went off. I got my fancy tester again and checked the dash fuse box. Now numbers 2,4,5,6,8 and 11 do not work. 14 and 15 only have about half power bc one pin lights up but the other is off or half power. Soooo yeaaaaa. I shouldve checked the main fuse box but i was so flustered about everything else I forgot. ummm welll woo...

Im going to take my dash completely off to see what went wrong...if i soldered a bad connection or what. It doesnt make sense tho bc it was working before. my next guess is does anyone know where i can get an 88 dash harness? I found an 89 on ebay but I dont think it will work. I just need to take off the dash to see what went wrong....on the bright side now i know what went wrong

also i have a loose connector near the alternator and I cant figure where it goes...it has two wires Black with a yellow stripe and a blue with a white stripe..it is attached on the same harness as the alternator.

 

Nice work on finding the problem.

with those wires. they could run to your fan switch on the back of your block. check that out.

 

Thanks I will check that out...I need to dig through the manual some more. Once I take the dash off (next tuesday) I will be able to get a better view of everything and hopefully ill be able to take pictures...

there are just so many damn loose wires under there from ppl ripping out the radio/clock/ac/heater...to make things worse i grabbed a new light/windshield wiper controls from another crx but it was from a later year....so the wires are different colors....i dont think it can get worse. of course it can.

If anyone has any other ideas let me know

 

bump for the cali heads getting off work