Toyota Repair Problems? Ask a Mechanic for Answers ASAP
hello, the fuel pump does not run with just the key on, it should run as soon as the computer receives a start signal when the engine is cranking, once there is ignition confirmation the circuit opening relay will trigger the fuel pump to stay on.
locate the diagnostic check connector under the hood, turn the key on and put a jumper wire between the terminals B+ and FP, this will activate the fuel pump bypassing all the relays and the computer, let me know the result of this test.
Okay, I think Im on to something. Checked continuity from FP to connector under seat , no current. I ran a " bridge wire" from FP (still hooked to +B) to connector , fuel pump runs, engine starts, then quits
Runs for a few seconds
Checked all the trunking/hoses running from airflow meter(on top of air filter?) across to intake manifold, they appear intact. I do not have a fuel pressure gauge. Where is the Schraeder valve/ connection for the gauge located on the fuel system?
Attachments are only available to registered users.
Hello, I'm available most of today. Thank you for being patient. When you are using the fp/b+ jumper You are bypassing the relays including the circuit opening and the efi relay. When powering the blue wire under the seat you are bypassing the relays and there associated wiring so the problem has to be foreward from the connector under the seat. there is no continuity from b+to fp this is normal.
I'm going to locate my wiring diagram and we can go from there to find where the open circuit or bad relay may be, I'll be back shortly.
Hello, with the key on is there voltage to the black/orange wire to the COR?
When cranking the engine is there voltage to the blue wire at the COR?
The black/white wire is the starter signal wire
blue goes to the pump
white/black is ground solid black is B+
green yellow is FC (fuel cut) and goes to the air flow meter
these are for the circuit opening relay you mentioned earlier
Check for starter signal voltage when cranking
check for voltage to the blu wire when cranking
check for ground to the white black wire
if those are ok, ground the green/white wire, if the engine start and runs the problem is the contact in the airflow meter
If it doesn't start or any of the above tests are negative replace the circuit opening relay.