Fuel pump wont prime with PowerFC, primes with stock ECU - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

WA_Sileighty · 09-04-2009, 07:47 PM

well i just tested pin 104 on the harness (fuel pump relay output)
with the stock ecu the output jumps to 12v when the key is turned on, then after the 5sec timer is up, it goes back to 12v.

with the powerfc connected, it jumps to 12v when the key is turned on, and stays, since the relay never clicked and started the 5 second countdown (engine not started)

so obviously it is whatever is supposed to ground my fuel pump relay. I am having a hard time to know what to look for. the pinout of the powerFC and the stock ecu should be the same since its for a redtop. can you tell me what wire i need to look for that should be retaining the ground? only wire on the diagrams is the one fuel pump relay wire

xpertsnowcarver · 09-04-2009, 07:56 PM

Quote:

Originally Posted by WA_Sileighty

so obviously it is whatever is supposed to ground my fuel pump relay

Correct.

Are you sure you have the 414AN014 or 414AN020?

09-04-2009, 07:47 PM	#1
WA_Sileighty Join Date: Oct 2006 Location: Vancouver, WA Age: 40 Posts: 48 Trader Rating: (0) Feedback Score: 0 reviews	well i just tested pin 104 on the harness (fuel pump relay output) with the stock ecu the output jumps to 12v when the key is turned on, then after the 5sec timer is up, it goes back to 12v. with the powerfc connected, it jumps to 12v when the key is turned on, and stays, since the relay never clicked and started the 5 second countdown (engine not started) so obviously it is whatever is supposed to ground my fuel pump relay. I am having a hard time to know what to look for. the pinout of the powerFC and the stock ecu should be the same since its for a redtop. can you tell me what wire i need to look for that should be retaining the ground? only wire on the diagrams is the one fuel pump relay wire