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My lexus LS400 will not start, I have test the fuel pump itseems OK when 12volts applied, but there is no voltage getting to the fuel pump otherwise when checked with volt meter. so what could be causing the lost of supply voltage to fuel pump
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Number 3 pin @relay sends power to the fuel pump (green wire), pin 2 (green/red gets grounded by the fuel injection power train computer, pins 1 AND 4 GET POWER THROUGH THE CIRCUIT OPENING relay, and EFI relay. Fuses in the circuit are, 10 amp fuse marked IGN and 20 amp fuse marked EFI. God-Bless ! this is for a 95 lexus LS400,
Sep 28, 2014 too old, to post ...? seems not. check pump voltage at the pump cranking. then if that fails to be 11v. then at the fuel pump relay, cranking, (the big pink wire is it)
FI fuses and ig-coil fuse must be good. and the CEL lamp glow key on, or ECU may be dead.(ask) always test with a $10 volt meter, voltages matter, test lamps were great back in 1950/60. these cars love to have, like 6 or 8v on the way to the pump, due to rust on the connectors. the meter shows this truth, and never a lamp.
You have to have adequate fuel pressure to start your motor and for your motor to keep started and run efficiently I would check your fuel pump I had a 2000 Lexus LS400 I had to replace the fuel pump
I assume the pump was replaced because it was getting power but no fuel pressure ? Are you still not getting fuel pressure ? Spark to the plugs ? Normal compression when cranking the engine ? Security light not staying on ?
Check the ignition switch, there is battery voltage to the fuel pump and ignition, because the engine starts with switch in the start position, now check the above with the switch in the run position, If there is no voltage replace the switch.
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