Hi, I am putting a crown V8 in a HQ Monaro. I have followed the wiring diagrams for the 4 relay (duel speed fuel pump) setup but Im having trouble getting the fuel speed relays to operate. The main EFI (master) relay energises when the ignition is turned on but neither of the fuel pump relays energise to start up the fuel pump. The engine check light is not on. Does anyone have any ideas or areas I can check, thanks.
I have also tried (after the 4 relay setup)
3 relay setup (single speed fuel pump)
and rewiring the originial relay box and found the same problem.
I noticed in the 4 relay (duel speed fuel pump) diagram that the Fuel Pump Speed Control Output and the Starter Output Fuel Power Relay both trigger the Hi Speed Relay for the fuel pump. At startup what voltages does the ECU put on the STA, FPR and FC pins for getting the fuel pump going. Just wondering because if the STA is high and the FPR is low, using both to trigger the Hi speed fuel relay will cause a short from high to low at those two pins, lots of current and depending on the devices used in the ECU damaged components.
I hope this is has not happened to my ECU.
I have also tried (after the 4 relay setup)
3 relay setup (single speed fuel pump)
and rewiring the originial relay box and found the same problem.
I noticed in the 4 relay (duel speed fuel pump) diagram that the Fuel Pump Speed Control Output and the Starter Output Fuel Power Relay both trigger the Hi Speed Relay for the fuel pump. At startup what voltages does the ECU put on the STA, FPR and FC pins for getting the fuel pump going. Just wondering because if the STA is high and the FPR is low, using both to trigger the Hi speed fuel relay will cause a short from high to low at those two pins, lots of current and depending on the devices used in the ECU damaged components.
I hope this is has not happened to my ECU.