RB20 Fuel relay problem no power from ecu 2 relay????????

[turbowookiee]

hello so iv'e traced my no fuel problem down to i'm not getting ne signal from the ecu pin for the fuel pump relay(black/pink signal wire) to kick on, my quetion is what could cause this? ive replaced the ecu, and still the same thing. what else cause this pin to go hot??? crank angle sensor??? any ideas??? i'm stumped atm thanks

[240z4u]

Soooo what happens? The wire should flip to ground if memory serves for a few seconds to prime the pump. Then it should turn back off.

I have no idea what your problem is.

[turbowookiee]

right the ecu doesnt send the ground signal to relay. but why???

[mott6904]

Without looking at a pinout or any diagram I would have to say that you possible have a bad circuit inside the computer. I would first try grounding the relay to see if the car will run. If not i would then look into your grounds and power supplies to the ecu.

[Kisorperformance]

i had a similar issue with my swap.... no signal to eccs relays. ended up being a bad pcm..... try just grounding the relay and see if everything else works/runs..... if it does you can run it that way with a switch or such untill you can get another pcm to try

[BigC_1988]

I put a rb25 s2 in my r32. I have spark but now fuel. The grey wire gives 12V but the signal wire only gives 0.03V. What could the problem be?

[mott6904]

the signal wire out of the ecu that turns the relays on are grounds. Check continuity between a ground and the signal wire.

[RustspecS13]

My rb20 has the same problem. I ended up shorting out the thick two wires, pins 3 and 5 on the relay, and I have about 1000 miles on my swap now. Runs good, just isn't the most elegant solution.

Ive been meaning to track the cause down but Ive been busy enjoying my car. I'll have to look into that this weekend.

~Alex

[lowrel]

hey im have the same sort of issue except mine is getting fuel just know spark i have tested 4 power at the 2 relays by the computer but am getting no power there can anyone help me?

it was running fine then started miss firing and s*** then it just died on me i have replaced the igniter pack the coils and plugs and im stuck now it gets know power to the ignitor pack either?

im running a rb20det in my nissan laurel it is a chipped ecu.

cheers