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Open circuit relay and the ECU maybe faulty

Tiny
SOPHIE BRUNO
  • MEMBER
  • 2000 TOYOTA COROLLA
  • 1.8L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 126,000 MILES
Cranks no start. The ECU was by passed 4 years ago ran the car with jumper wire at the open circuit relay control side power to control side ground the car ran for 4 years however now there is no control side power to start car fuel pump not supplying gas to engine.

I have not taken the pm meter to check both control side ground and power. The wire reaching fuel pump is black and white.

Did I blow out EVU?
Respectfully
Bob Bushop
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Saturday, December 21st, 2024 AT 12:36 PM

2 Replies

Tiny
AL514
  • MECHANIC
  • 4,795 POSTS
Hello, the Circuit Opening relay gets power on both the Load and the Control side of the relay from the EFI OR F-HTR Relay then from the EFI OR F_HTR Fuse 15amp and the IGN Fuse 7.5amp which is on the ignition switch, Ill post the wiring diagrams, but I would start with checking fuses with a test light in the engine compartment and the Dash fuse panel.
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Sunday, December 22nd, 2024 AT 2:52 PM
Tiny
AL514
  • MECHANIC
  • 4,795 POSTS
Start by checking for power at the 2 fuses that feed those relays, the 2nd fuse should be Hot at all times, the other is with the key on.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester
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Sunday, December 22nd, 2024 AT 2:57 PM

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