sohctodohc

a little info:

ej1 civic
no engine in it right now
just replaced firewall harness



so i just got done swapping a new firewall harness in and get everything plugged in, it has a chasebays engine harness(deletes the 2 shock tower plugs, goes straight to ecu)

i check everything electrical and everything seems to be working good. throw the fuel pump in it to make sure it works to. turn the key over and it doesnt prime. i listen to the main relay and i dont hear a click.

as i said the car doesnt have a engine in it so i took the thermo housing ground and grounded it to the body of the car(is this ok?)

i went through the haynes and checked things and im not getting conituiny(sp?) at terminal 2 on the main relay connector. the main relay is good checked it in my other civic.

other note when checking continuity at a7 and a8 i got a little at a7 but wasnt getting a reading on a8 same goes for a25 a27 and b1. but this could have been because i wasnt getting a good touch on the pins is there some tricks to this?

some help would be greatly appreciated sorry for the long post

Former User

Use a wire to ground terminal 2 locally (e.g. against the dash frame). Does the fuel pump now prime?

By the way, both the main relay and ECU are separately grounded to the thermostat housing. Have you ensured grounding of these different wires?

Did you check fuses 31 and 24?

sohctodohc

all fuses are good that was the first thing i checked.

how are they both seperately gorunded there? i thought there was just one ground there? i didnt know this so i guess i just have the engine wiring harness grounded there??

Former User

ECU terminals A26 and B2 must ground on the thermostat housing (or the body frame in your case).

Main relay terminal 2 must also ground the thermostat housing (or the body frame in your case) and on ECU A23 and A24.

sohctodohc

but arent they connected into that ground wire at the thermo housing??(or body frame in engine bay)???

Former User

You must ensure that they are properly grounded in your car. Use a multimeter to test those terminals for continuity to body ground.

sohctodohc

and your also saying there should be conituity between terminal 2 and a23 and a24?

Former User

Yes

sohctodohc

ok looks like i have something to tomorrow. also is there a better way of checking the ecu plugs rather than just jamming the probe in them? feel like img going to screw some ends up on the wires

Former User

Remove ECU connector A and B and the main relay connector. You should measure continuity to body ground individually at terminals A26 and B2 of the ECU connectors and at terminal 2 of the main relay connector.

sohctodohc

sorry im electrical noob, so if one of these isnt getting continuity then i have a bad ground somewhere??

Former User

If you meant continuity to body ground, then yes.

sohctodohc

k thank you very much, i will report back tomorrow hopefully with what i find!

cehcivic15

doesnt this work off the cam position sensor...the cam position tells the relay that the motor is not turning so it shuts the pump off after 3 seconds..and when its running, the cam sensor tells the relay its running so it keeps the fuel pump on? if the cam sensor is not pluggen in wouldnt it keep it from clicking the relay and turning on the pump? im not sure ronj but i know you know the answer to that

sohctodohc

any different view here would help so since i dont have a single sensor plugged in as far as the engine harness is concerned this could be plausible.

also ronj if i dont have continuity at terminal 2 on the main relay connector what would this mean???

cehcivic15

also, chasebays offers lifetime warranty on their products and they say that they will help you diagnose any problems over the phone. however, i have dealt with chasebays and met chase mcmaster, and well i really shouldnt say anything bad on here about chasebays...but goodluck getting to talk to him on the phone

OliverV

i had the same issue but i made a new ground to the ground point above starter, where 4 points of ground run together.
and besides that i installed a extra ground to it also.. so it is extra grounded.. and then the car started working. before that i had also no click or something from the main relay or fuel pump.

Former User

You are correct. The fuel pump won't run continuously without receiving a signal from the CKP sensor telling the ECU that the engine is turning. The fuel pump will, however, prime for 2 seconds without a CKP sensor signal.

Former User

How exactly are you doing the continuity test?

sohctodohc

im taking a multimeter and one probe to the wire and one probe to a bolt on the chassis.

ive tested other grounds to this bolt so i know the bolt will work for a ground.

sohctodohc

what kind of resistance should i get when i check?

Former User

What wire are you touching and is the main relay or any ECU connector unplugged when you are doing the test?

sohctodohc

both a and b and main relay are unplugged

Former User

Unplug the main relay connector but leave the ECU A and B plugged in. Then measure continuity to body ground at terminal 2 of the main relay connector.

HarosGSRek

^ron you should post that link to that aerospace website where they fixd the main relay by soldering the spots inside....