sr20 swap runs with no ecu fuse? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

BONIN240SX · 03-31-2013, 12:50 AM

I have a 94 vert I just swapped an s13 blacktop into. The harness and everything was already done by the previous owner. I swapped everything in and it runs great. But when shutting the key off I got the buzzing egi relay?? Well I searched this as much as I could and found if you pull the meter fuse I get no buzzing. Well most of the things on the meter circuit come from the ecu right? So I pulled the ecu fuse, and figured it wouldn't start...I was wrong it starts runs great, and my wiring gremlins are gone. Anyone ever ran into this before?

Thanks and happy Easter!

OrangeVirus1 · 03-31-2013, 12:52 AM

sounds like the wiring was done wrong?

BONIN240SX · 03-31-2013, 12:54 AM

So would you assume that the ecu power is hooked up directly to the battery? I'm not great with wiring but I'm going to try and work through it

OrangeVirus1 · 03-31-2013, 12:56 AM

I Don't know specifically for SR's but I'd think that the ecu gets power not directly from the battery but through the relays that switch it on and off when you turn the ignition on / off

although the ecu should have a costant power for ecu memory, but I don't know if that would actually run the ecu.. maybe.

I know my mazda will use the constant "memory" power as a back up if it gets no power anywhere else. but that's a 2011 car lol.

03-31-2013, 12:50 AM	#1
BONIN240SX Zilvia Member Join Date: Feb 2012 Location: madison,wi Age: 31 Posts: 157 Trader Rating: (1) Feedback Score: 1 reviews	sr20 swap runs with no ecu fuse? I have a 94 vert I just swapped an s13 blacktop into. The harness and everything was already done by the previous owner. I swapped everything in and it runs great. But when shutting the key off I got the buzzing egi relay?? Well I searched this as much as I could and found if you pull the meter fuse I get no buzzing. Well most of the things on the meter circuit come from the ecu right? So I pulled the ecu fuse, and figured it wouldn't start...I was wrong it starts runs great, and my wiring gremlins are gone. Anyone ever ran into this before? Thanks and happy Easter!

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03-31-2013, 12:52 AM	#2
OrangeVirus1 BANNED Join Date: Jan 2013 Location: PyongYang DPRK-N. Korea, Province 2 Posts: 1,236 Trader Rating: (0) Feedback Score: 0 reviews	sounds like the wiring was done wrong?

03-31-2013, 12:54 AM	#3
BONIN240SX Zilvia Member Join Date: Feb 2012 Location: madison,wi Age: 31 Posts: 157 Trader Rating: (1) Feedback Score: 1 reviews	So would you assume that the ecu power is hooked up directly to the battery? I'm not great with wiring but I'm going to try and work through it

03-31-2013, 12:56 AM	#4
OrangeVirus1 BANNED Join Date: Jan 2013 Location: PyongYang DPRK-N. Korea, Province 2 Posts: 1,236 Trader Rating: (0) Feedback Score: 0 reviews	I Don't know specifically for SR's but I'd think that the ecu gets power not directly from the battery but through the relays that switch it on and off when you turn the ignition on / off although the ecu should have a costant power for ecu memory, but I don't know if that would actually run the ecu.. maybe. I know my mazda will use the constant "memory" power as a back up if it gets no power anywhere else. but that's a 2011 car lol.