wyte_myke

OK so of course I'm new here. I will try and not mess this up too bad lol. I am on my phone at the moment so no promises.
So here's my deal. I have a 95 civic ex coupe
Did a b16 swap on it about a yr ago. Recently had to replace the transmission. Also had the ecu chip reflashed because before replacing the trans the chip lost its data and computer was running on d series map (7200 rev limit and bad gas mileage)
So I do a recent overhaul while I have the motor n all out of the car. Seals gaskets etc
So I get everything wrapped up bolted and plugged back in ready to crank it up
I turn the key to ign2 cel comes on like it should but never goes off. Now I'm like wtf. I do it again. Now I can hear that the fuel pump is not priming.
I then begin the long process of troubleshooting and no answers. I've looked all over the internet. Tested many many test and still nothing.

Heres a break down to make all that rambling wasted lol
Turn key and car cranks but doesn't start
Fuel pump doesn't prime
Cel stays on
Tried multiple computers (p28s)
Tried multiple relays (even tested current one hooked to battery then ohm out and all clicks worked fine and everything ohm out as it should)
I have checked every fuse many times
Checked tstat ground and others
Tested relay harness. All pins tested right voltage but the last one in the test I think the yellow green to the fuel pump. I can double check I'm heading g over to the car as soon as I'm done with this. But it had no voltage
I did jump the pins at the relay and pump kicked on


I'm just pretty much lost now. Everything seems to be testing good as far as the parts but voltages have been off in some places. Like no ground at injectors. I feel its one thing cause problems with multiple items. I.e.a ground wire

Any help would be greatly appreciated friends are not any help right now lol
So hopefully it makes sense. I'm going to work on the car now and will have my phone on me

Thanks in advance
-mike

Former User

Check whether fuse 31 or 24 is blown.

Details? What pins/wire colors did you jump?

wyte_myke

Ok i Checked both with test light and multimeter. They're good

wyte_myke

Side note glad you replied Ron. Seen you on here all over was hoping you would show up lol

Former User

Both tabs on both fuses?

Former User

wyte_myke

Yes both tabs. Fuse 31 is the one in hood fuse box right?

Former User

yes...

wyte_myke

Sorry didn't see that still on my phone. I don't remember which ones. I followed a test I saw online. I believe I jumped the ground to the whatever fuel pump wire. Not sure unfortunetly now

Former User

Repeat the jump tests.

Turn key to ON(II).

Jump the 1 and 7 pins.

Jump the 5 and 7 pins.

Do both tests cause the fuel pump to run?

wyte_myke

Relay plugged in or no

Former User

Unplugged.

wyte_myke

Yes the fuel pump kicked on for both

Former User

Plug the main relay back in.

Unplug ECU connector A.

Ground pin A7 or A8.

Does the fuel pump run while each pin is grounded?

wyte_myke

Grounded a7 fuel pump kicked on. A8 has no wire

Former User

Do you have a multimeter?

Your tests indicate no problem on the main relay side of the fuel pump circuit.

The next few tests are on the ECU side of the circuit and require a multimeter.

wyte_myke

Yes I have a multimeter

Former User

Unplug ECU connectors A and B.

Turn key to ON(II).

Measure voltage to body ground at pins A25 and B1.

Measure continuity to body ground at pins A23, A24, A26, and B2.

Post the results.

wyte_myke

A25 and b1 both showed battery voltage
A23 24 ohm out but my meter didn't read dead 0 it was 27.0
A26 and b2 had 2.0 when ohm out

Former User

Hmmm...Can you depin A23 and A24 to attach wires that ground on the metal frame under the dash. The re-insert the pins into the connector, plug the connector back into the ECU, and check whether the pump now primes with the key.

wyte_myke

I don't know exactly how to depin. I've seen the pics of how to though.
I will do that now

wyte_myke

OK so I depinned a23 and 24
Decided to ohm them again
Now they ohm out fine
Think my meter just didn't get in there good

But to confirm it wasn't the pins not set in right I plugged it back together and still nothing has changed

Former User

Okay sounds good.

Plug everything back in.

Unplug the MAP sensor.

Turn key to ON(II).

Measure voltage to body ground at all three connector pins.

wyte_myke

OK the outside two pins. The white and the yellow/red had 5v the middle green/white had 0

Former User

My initial conclusion:

1) The ECU is bad

or

2) One or more of these ECU connector pins (A7, A25, B1, A23, A24, A26, and B2) is not contacting the corresponding pin in the ECU.

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If you jump the service connector, does the CEL blink any codes?

If you do this^, does the CEL turn off when the key is in ON(II)?