Problem solved! :)
The plastic clips on the frame, that holds the wiring harness above the front driveshaft, were broken and allowing the harness to rub on the driveshaft. Three wires, red/yellow, orange. and blue were exposed. Some waterproof...
Go back and read post #16 in this thread. Something is shorting to ground, which is popping the EFI fuse.
Use a meter set to continuity (with a beep tone if possible). 1 lead in the load side of the EFI fuse terminal, the other on a good ground...
Thank you for posting this! I'll be working again on my girlfriends 95 tomorrow. I downloaded the 96 EWD and have been studying the wiring diagrams. I've learned a lot in the past week. Though one part still has me stumped... The vehicle will...
Do you have the Toyota EWD? This is all laid out for you.
The EFI relay gets +12 on pin 2 from the 15 amp EFI fuse. The 15 amp EFI fuse is fed from the MAIN fusible link.
However if the MAIN fusible link was faulty, you'd have no headlights, no...
There are 3 fusible links in an 80 Series, and they're all off the positive battery terminal and grouped as 1 part number.
2 go to the junction box and the other one goes to the grey connector.
This is all shown in the EWD power source section...
This is all interesting as I've been chasing a code 25/26 without much luck, and going through my notes I noticed the previous owner had a repair done for a melted 15A EFI fuse that I think is the one you are describing. The code 25/26 lean/rich...
Another possibility is connector BO1, which lives under the body on the left side under the C pillar. All fuel pump power goes through this connector and it is exposed to the elements.
Very improbable that relays would cause this issue. They either open or close on the contacter side. If there was a short on the logic side of the COR, the 7.5 amp IGN fuse would pop.
If the EFI relay was an issue, this engine wouldn't run. On...
Unplug the 02 sensors for a few days and report back. On my 94' the 02 sensor wire had a wiring short and it would eat up ECU fuses to the point where it wouldn't even start unless the 02 sensor was unplugged.
Once the wiring short was fixed (in...
Thank you for your input! You and a handful of other Mudders always peak my interest.
I spent the day in another Cruiserhead's shop and here's what we found/did.
Replaced the fuel pump relay with OEM.
Replaced EFI relay with OEM
Inspected the...
The 15 amp EFI fuse supplies +12 to all of the ECUs sensors and VSV valves, along with the ECU itself. I would inspect the 2 well known trouble spots. The engine harness that runs next to the EGR pipe and the ECU harness that runs along the...
Negative. It is the logic on ECU pin E7-13 that causes the FPR to switch. FPR=fuel pressure relay.
The COR just feeds +12 to the FPR and is also controlled by the ECU E4-14 FC=fuel control.
All +12 for this and most other ECU logic comes from the...
Yes you are correct. A worn out pump can draw more current to keep up with the demand. Also a blocked fuel filter(In the tank) and also the filter which is in the engine bay somewhere. Could be another reason to draw more current to keep up.
But...
You should have seen what is called "witness mark's". either shiny or most likely little blast marks. When I see a wire like that, I know its been arcing for quite a while. It just wasn't bad enough to blow the fuse. Just because of the issues...
Fuel pump should be drawing more when trying to warm up ? Thats how I thought it worked. You use more fuel warming the engine up to operating temperature. So therefor fuel pump is delivering more fuel drawing more current.
Obviously that only...
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