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I have a 94 toyota pickup it will not crank and i have found…

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i have a 94 toyota...
i have a 94 toyota pickup it will not crank and i have found if i unhook the factroy radio the EFI fuse will blow when pluged back in with the key off.i have checked all the wiring it all looks good. at my wits end
Submitted: 2 years ago.Category: Toyota
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Answered in 2 hours by:
1/31/2016
Toyota Mechanic: Dj, ASE Certified Technician replied 2 years ago
Dj
Dj, ASE Certified Technician
Category: Toyota
Satisfied Customers: 1,910
Experience: ASE Master Tech, 30+ years in automotive repair.
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Hello and thank you for trusting us with your question. I'm DJ.

I can tell you up front that this isn't going to be easy to diagnose. Nothing like, 'replace this relay' or 'these two wires are crossed.'

The first thing I would do is look closely at the wiring to the oxygen sensors under the truck. Whenever there's an EFI fuse blowing, about 80% of the time that's where the problem is. With wiring harness comes out of the clip and rubs against the exhaust. This melts through the insulation to the oxygen sensor heaters.

Next I would look at any aftermarket equipment and where it's wired in to see if there's a problem.

At this point you'll need to make a tool. Take an old headlight bulb and attach two wires to it so that if you apply power to the two wires, the headlight bulb bright beam will illuminate.

Then take these two wires and plug them into the fuse box in place of the EFI fuse. When the circuit is shorted, the headlight bulb will be fully bright. When it's not shorted, it will be dim.

This way you can jiggle wires, plug things in and out and not have to worry about burning anything up or continuing to blow fuses.

I know this is a bit odd, so if I need to explain it a different way, please let me know. It's the best method I've ever found for finding and fixing short circuits.

So check the wiring to the 02 sensors, check for any problems with aftermarket stuff. If you don't find anything, make the tool and we'll continue from there.

DJ

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Customer reply replied 2 years ago
no after market suff in the truck.with the factory radio unpluged the fuse is good,plug the radio in and the fuse pops.i have checked all 02 sensor wires all are good. checked all wiring
Toyota Mechanic: Toyota Service, Toyota Expert replied 2 years ago
Toyota Service
Toyota Service, Toyota Expert
Category: Toyota
Satisfied Customers: 5,239
Experience: 30+ Yrs of auto experience, Award Winning Svc. Manager; Just Answer Customer's Choice Award Winner
Verified

Hello. Different expert here. Let's bypass the EFI fuse issue for a moment and focus on the no-crank condition.The EFI fuse has nothing to do with the engine not spinning when turned to start, blown or not blown. Can you do some voltage tests to check a few critical things?

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