Cranks no start, fuel pump does not prime

Tiny
ALPHASENTORY GALAXY
  • MEMBER
  • 2000 TOYOTA COROLLA
  • 1.8L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 104,000 MILES
Hello Goodfellows,

Fuel pump does not prime with key on nor in start.

Fuel pump has a voltage drop, it reads 9.0volts.

ignition fuse 7.5 amp intermittently blows out.

no codes on diagnostics.

the transmission shifter is stuck on park and I cannot hear the solenoid when pressing the lock release button.

Brake light switch does not light up all rear lights the one on rear windshield does not work; bulb is good.

ECM powers and grounds are good.

control wire red white wire, from ECM to open circuit relay control side reads 2.0 volts it does not ground to 0.0 volts and the 5v reference voltage is stuck on 2.0 volts.

camshaft voltage is 0.1 volt.

crank shaft voltage is 3.4 volts.

throttle sensor has 5 v fef

mass air flow has 5 v ref

Is this a short to ground?

Is this a short to positive?

In engine bay fuse box on the positive side of battery used a test light to test for short it is dimly lit when I press brake pedal it get brighter.

Use a volt meter to test for parasitic draws on the negative side of battery it is 3.4 amps that is high.

I opened the ECM could not see solder damage nor burned spots, transistor, capacitors all look normal. Could not smell smoke board is not cracked it looks good cannot call the ECM.

It has a brand new fuel pump it has injector power; it has coil power; the neutral safety switch looks normal; the shifter solenoid looks normal it responds to power.

The EFI relay is warm to touch and the open circuit relay too.

Thank you for your due diligence and support.

Respectfully,
Andrameda Galaxzy
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Thursday, November 7th, 2019 AT 6:54 AM

3 Replies

Tiny
KASEKENNY
  • EXPERT
Sounds like you have an issue on the ECM control side of the relay. We need to cover the fuel pump issue here and then we can address the other issues that are not resolved on a new post as we need to keep each to one issue.

Sounds like you have power on the supply side of the relay but we don't know about the ECM control side.

So the way to check this is to remove the relay and check for ground on the terminal from the ECM as the ECM supplies the ground which closes the relay. Put your red lead of your meter and put it on battery positive. Then put the black lead on this terminal of the relay. Then turn the key to on and your meter should read 12 volts. If it does not then the ECM is not grounding the relay.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Please let us know what questions you have and we can go from there. Thanks
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Saturday, May 22nd, 2021 AT 8:24 AM
Tiny
ALPHASENTORY GALAXY
  • MEMBER
Dear Kasekenny1,

Thank you for all your support. Car is running again. I am not certain I fix the ECM when turning the key I cannot hear the 2 second prime from fuel pump, and it will not start normally. However, I by passed the fuel pump to a shut off switch, when I turn key I can hear the fuel pump running constantly. When key is on position turning it to start the car starts up fine. The shut off switch allows me to turn car on without the fuel pump running to perform diagnostic test. It been a while saying grateful to you and updating you.
Respectfully,
alphasentory andrameda gaxlazy
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Tuesday, November 30th, 2021 AT 10:56 PM
Tiny
KASEKENNY
  • EXPERT
Got it. If you are running the fuel pump through an external switch and it works properly then I think you pretty much confirmed an ECM control issue.

Basically, all you are doing is taking the place of the ECM with the switch and sending power the way it should be doing.

I would not recommending leaving it this way only because if you are ever in an accident the ECM will shut off the pump. However, the way it is now, the only way it will shut off is to flip that switch which means if you are in an accident you would have to flip the switch and depending on the severity of it, you may not be able to. This could turn a bad situation into a fatal situation if the fuel pump continues to pump fuel.

However, this is a great job and thanks for coming back to update us with your findings. This will surely help others in the future.
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Wednesday, December 1st, 2021 AT 7:18 AM

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