Question about 1994 Toyota Corolla

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No power going to the fuel pump... 1994 toyota corolla

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4afe or 7aFE engine?
as always for ever and ever, check all fuses.
check it cranking some ECU dont power pump until cranked.
the ones that key on power are 3second, can you run that fast?
no. so crank.
if the fuel pump relay closing and sending full 12vdc to pump wire.?
no?
then fuse is blown
if cel lamp is not on key on fuses, are blown or lamp or ecu bad.
fix lamp first it must glow, that glowing means ECU passes, basic self tests. (like a pc doing P.O.S.T) (i rebuild and tune ECU's)
do you need a schematic,(alldata.com has it)

books are amazing things, no? im looking here, seen it many times.
the magic fuel pump relay on the 4AFE.
it is really a 2 coil relay forming what is called logic "AND"gate
7a works same,.... just looked
the ECU enables coil A with LC command line (software) 0v here.
the main relay must close and 12vdc out to pump relay
then the driver cranks, and relay coil B is activated. and pump spins.
always crank and test. see why?
if you need bigger photo ask, .....
if the relay fails to close cranked, check that the crank
signal makes it to (12v) to top left coil below.
if not there will NEVER be fuel. see crank sig below in red.



no power going to the fuel pump... 1994 toyota - 8789662-pwhjtvbdga2ldpurmpdgxawg-1-0.jpg

Posted on Jan 27, 2015

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Ck wore harness guide I believe it come from relay
in engine compartment..

Posted on Jan 24, 2015

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Check fuse, relay, wiring, many times the relay is faulty

Posted on Mar 28, 2011

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1 Answer

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