95 Civic Si - fuel pump isn't coming on, main relay isn't clicking, no start
08-02-2016, 04:11 PM
#1
Honda-Tech Member
Thread Starter
95 Civic Si - fuel pump isn't coming on, main relay isn't clicking, no start
** Solved **
I did search, and there are a lot of threads(249) to go through, so I figured I would put this up while I skim. So here's the skinny:
I put a 95 B18C1 in my 95 Si. Easy swap and have done a couple of these. The car ran before I swapped it, but now the fuel pump isn't coming on. The main relay isn't clicking. I have an s300 plugged in and I'm pretty sure the ecu isn't getting power because it will not let me upload maps.
Here's what I've tested so far:
- main relay (good)
- ign. switch (good)
- two fuses, the 15 and 7.5 amp fuse underhood (good)
- one fuse, 7.5 amp under driver's dash (good)
Any advice would be awesome! Thanks.
I did search, and there are a lot of threads(249) to go through, so I figured I would put this up while I skim. So here's the skinny:
I put a 95 B18C1 in my 95 Si. Easy swap and have done a couple of these. The car ran before I swapped it, but now the fuel pump isn't coming on. The main relay isn't clicking. I have an s300 plugged in and I'm pretty sure the ecu isn't getting power because it will not let me upload maps.
Here's what I've tested so far:
- main relay (good)
- ign. switch (good)
- two fuses, the 15 and 7.5 amp fuse underhood (good)
- one fuse, 7.5 amp under driver's dash (good)
Any advice would be awesome! Thanks.
Last edited by SpeedRacerEX-R; 08-02-2016 at 06:10 PM.
08-02-2016, 04:36 PM
#6
re: 95 Civic Si - fuel pump isn't coming on, main relay isn't clicking, no start
Unplug main relay.
Turn key to ON(II).
In connector, jump pin 1 or pin 5 to pin 7. Does the fuel pump run?
Turn key to ON(II).
In connector, jump pin 1 or pin 5 to pin 7. Does the fuel pump run?
08-02-2016, 04:50 PM
#7
Honda-Tech Member
Thread Starter
re: 95 Civic Si - fuel pump isn't coming on, main relay isn't clicking, no start
Okay, pin 1 to 7 runs the fuel pump with ign off. Pin 5 to 7 runs fuel pump in key ON(II). BUT, now when I plugged the relay back in and tried it again, the fuel pump runs, but the 'battery' light is blinking and the speedo is bouncing around. 
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08-02-2016, 05:10 PM
#8
Honda-Tech Member
Thread Starter
re: 95 Civic Si - fuel pump isn't coming on, main relay isn't clicking, no start
And now the ecu turns on also. I was able to access the sensors. It says the voltage is bouncing around between 8v and 10v, but I put a multimeter on the battery and it is 12.4v
08-02-2016, 05:57 PM
#10
Honda-Tech Member
Thread Starter
Re: 95 Civic Si - fuel pump isn't coming on, main relay isn't clicking, no start
Nope! It doesn't turn over or click. Thinkni should replace the battery?
08-02-2016, 06:10 PM
#12
Honda-Tech Member
Thread Starter
Re: 95 Civic Si - fuel pump isn't coming on, main relay isn't clicking, no start
So, I went to go record a video and it turned over and started! 
The only I did from the last time I tried what you suggested was: a) Put a charger on the battery and b) Put another ground strap on the transmission. I'm not sure which one solved the problem, but I'll take it. 
The only I did from the last time I tried what you suggested was: a) Put a charger on the battery and b) Put another ground strap on the transmission. I'm not sure which one solved the problem, but I'll take it.
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