Crazy Electrical issue with EFI system

MA70-3.0GT · 04-26-2010, 04:15 PM

have you tried the fp & b+ jumper trick in the diag. box yet? (check tsrm to make sure my memory's not lying on those terminals to jumper before you connect anything 'cause I ain't exactly on form today!!!).

This should result in the fuel pump running permanently with the ign. on & IIRC bypasses the relays & fuses. If the car's then running but rough & with seemingly random codes as you described then it could possibly be the ECU or it's connections/earthing, I'd check/double check/replace the cheap stuff first though as you've started doing, maybe even swap the fuse again in case it looks fine but is duff, I've had 'em like that before. (if it is gone again maybe check how much current the pump is drawing too?) and only spend on an ECU after you've exhausted every other route.

04-26-2010, 04:15 PM	#2
MA70-3.0GT 12psi boost Join Date: Oct 2009 Location: Crewe, England Posts: 356	have you tried the fp & b+ jumper trick in the diag. box yet? (check tsrm to make sure my memory's not lying on those terminals to jumper before you connect anything 'cause I ain't exactly on form today!!!). This should result in the fuel pump running permanently with the ign. on & IIRC bypasses the relays & fuses. If the car's then running but rough & with seemingly random codes as you described then it could possibly be the ECU or it's connections/earthing, I'd check/double check/replace the cheap stuff first though as you've started doing, maybe even swap the fuse again in case it looks fine but is duff, I've had 'em like that before. (if it is gone again maybe check how much current the pump is drawing too?) and only spend on an ECU after you've exhausted every other route. __________________ '89 MA70 Supra GT aero 3.0turbo JDM, Rebuilt motor, K&N intake, 3" stainless turbo-back. New turbo and braided line kit... '89 Honda NC27 400, NC23 cams, open pipe, PC36a shock & possibly Showa USD forks... '83 Yamaha 29R XJ750E-II, number 69 off the line, only runner in the country? Original except Koni shocks '95 Honda PC26 CB500R, Winter hack, hateful, trying to sell it I'm not paranoid, they really ARE after me!!!