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Old 10-04-2006, 08:47 PM   #1
DeusExMachina
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Default STi ver3 to 2000 RS: Fuel pump relay wire?

I'm starting a new thread because this is more on topic and more specific.

The car starts now, and runs if I jump the fuel pump.

However, the ECU's fuel pump relay pin isn't doing anything. It is not giving any power. However everything else seems to work, the injectors are opening and the coils are firing, because the car does idle. Its idling a bit high, but it is working.

Anyone have any idea?


My only idea is that it is the incorrect wire for the fuel pump relay. I am using the wire on B137 (the 26-pin connector), pin 7, listed as Fuel Pump Relay Control on this pinout: http://www.northursalia.com/modifica...g/v3and4-2.jpg
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Old 10-04-2006, 09:37 PM   #2
Mudpup
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My copy of the Ver IV service manual has pin B137 / 7 listed as the fuel pump relay control for vehicles without immobiliser. It's B137 / 17 for vehicles with the immobiliser.
It is a pull to ground control "signal". When the fuel pump is supposed to be on, this pin allows a current flow path through the fuel pump relay to ground. When the fuel pump isn't supposed to be running, the pin is not grounded. If you were to measure the voltage (with referance to ground, IG SW on, engine off**) on this pin when the fuel pump isn't supposed to be running, you will read battery voltage. With the circuit wired properly, the pin will read zero volts when the engine is running.

** I don't have a description of the fuel pump operation during start up, ie, if it primes the rails and then turns off if the engine doesn't start, like the '205. I'll check mine tomorrow when the kid isn't asleep.

Hope it helps.... I'll check back tomorrow.

Jason

Last edited by Mudpup; 10-04-2006 at 09:46 PM. Reason: spellen'
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Old 10-04-2006, 10:00 PM   #3
DeusExMachina
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If you had those manuals in a digital format, I would love you forever.

Thats what I thought it was doing. For some reason the RS seems to do it opposite, its a switched 12V signal, and the JDM ECU is switched ground.
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Old 10-04-2006, 10:55 PM   #4
johnkaldar
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if your fuel pump turns on when the key initially goes into the on position and then continues to run when you are idling for more than a couple of seconds, then your relay has to be working fine. Unless this is only happening when you jump the fuel pump to run. Did you swap out the fuel pump and hook up wire wrong? Is your wire going to the correct RS wire to switch on the relay? Also, are all of the fuses good? It seems unlikely that this would be the only switch in the ecu that is bad.
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Old 10-04-2006, 11:01 PM   #5
DeusExMachina
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Its only working when I jump the fuel pump.

I swapped the pump, but tested it before I tore everything down for the swap (finished the install, turned key, primed pump, started car, thumbs up).

I don't know where to begin as far as fuses. There don't seem to be any Fuel Pump fuses?
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Old 10-04-2006, 11:31 PM   #6
johnkaldar
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You could physically run a new wire from the output of the ecu to the relay to make sure that isn't the problem. If you have an extra relay you could also swap that to make sure that isn't the problem. It is better to problem solve by slowly eliminating any steps that could cause the problem. Once you know that the wiring is good, then it has to be power to the relay, the relay, the fuel pump, etc. Keeping going down the line starting at the easiest to the most expensive.
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Old 10-04-2006, 11:33 PM   #7
DeusExMachina
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Well, I already did check.

I pulled the wire so it was just a lead coming from the ECU, and monitored what it was doing.

It did nothing..
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Old 10-05-2006, 06:56 AM   #8
Mudpup
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Maybe your path to ground for the ecu isn't connected. There are a few grounded pins. Check the following:

B137 / 14, 24, 25
B136 / 12, 18

All of 'em go to chassis ground.

Check your PMs.
Jason
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Old 10-05-2006, 09:37 AM   #9
DeusExMachina
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Yeah I believe the grounds are correct.

What I think actually is going on is, I have two wires of the same color switched. I believe my Fan 1 and Ignition power is swapped, as that ignition power controls the fuel pump relay on one side! I'm going to try it tomorrow when I'm at the shop.

Thanks for the PM, I'll send him one.
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Old 08-15-2014, 04:39 PM   #10
nasiocjunkie
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bump for this question: Can i use fuel pump relay in 2000 rs for a v4 jdm sti conversion wire harness merge? I'm thinking yes but I need to be sure.
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