Truck shut off while driving; won't start

Had an "oh shit"er today. Engine shut off and won't start. Had to get towed home.

Either a bad relay or fuel pump are my thoughts; where should I start?

I hooked up the OBDII reader and didn't get any signal from the ECU. I removed the AEM FIC piggy back to isolate the issue. I'm thinking a relay somewhere blew.

 

At the battery with the voltage and go from there

Does it crank but not start ??

Or won`t even turn over??

 

don't overlook checking the big giant main fuses in the under hood fuse box

 

Or the fuse block under the dash.

 

Battery is strong. Cranks good and hard, just missing spark or fuel.

All fuses good. It has to be a relay. Swapped the fuel pump relay with one of the other relays to see if that was the issue. Going to check the fuel line pressure tonight. If there is still pressurized fuel in the lines then pump is good. If no fuel or pressure then pump is bad. But with the OBDII not reading, tells me a relay that feeds the ECU is bad... Not sure.

 

In my experience, relays very rarely fail.

 

Had this happen once on the freeway. Toyota swore it wasn't the fuel pump when I dropped it off. Later in the day the called me and said i was correct.

 

Had any contact with a 3rd gen? Could be CPS if so.

 

I hope so. That would be easy. Electrical would be shitty.

Haha, where's BlueT to start raving about Toyota?

 

Haven't seen him in forever... @BlueT I think he was banned or something, he doesn't show up in user name suggestions

 

Last seen 5 months ago

 

Bad circuit open relay or EFI relay, or 7.5a ign fuse??? Mine is green mounted just below the steering column behind the lower dash panel.


This is for a 99 5vz, but the 3rz is wired the same. Idk what your your truck is but it's probably similar...

 

ECM grounds vibrate loose

Is your no connection with the ECM just a dirty and corroded plug ??

Involved with lots of water being were it is not supposed to be ?? This tends to cause all sorts of electrical fun.

Just how many miles are we talking about here ??

 

138k miles. Electrical connections look good. Will check relays under steering column.

 

Have you been dealing with any misfires or stumbling prior?

 

Electrical grounds...A constant refrain

 

Would rain the battery though, no? Going to test the fuel pump today weather permitting.

 

That's a douche bag comment

 

Yes. Yes it is.