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Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 23821
Experience:  23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
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The sti wire for the eec self test has 5 volts on it I

Customer Question

the sti wire for the eec self test has 5 volts on it I understood this wire is a ground due to the scanner will not turn on until it is plugged in
JA: Have you checked all the fuses? Do you have a wiring diagram?
Customer: yes and it does not tell me if it is a ground or has voltage on it
JA: What is the model/year of your Ford?
Customer: 1993 ford f150 with 5.0
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: yes I am
JA: Anything else you think the mechanic should know?
Customer: i can not get my scanner to turn on with the wire. when i ground the wire it will turn the scanner on. however when i check the wire with a voltmeter it has 5 volts on it
Submitted: 11 months ago.
Category: Ford
Customer: replied 11 months ago.
wondering howmy answer is coming
Expert:  Juan Crespo replied 11 months ago.

Hi there, perhaps I can help.

What's the scanner's brand and model number?

Customer: replied 11 months ago.
snap on mt2500, also the same problem with a modus ultra version 16.2
Expert:  Juan Crespo replied 11 months ago.

Is the MT2500 able to power up before plugging it into the ECC-IV connector?

Customer: replied 11 months ago.
no i just need to know if the wire i am asking about has 5 volts or not
after that i am good can you help with that
Customer: replied 11 months ago.
it will not power up berfore plugging in unless i turn it on.
Expert:  Juan Crespo replied 11 months ago.

I'm afraid I can't help you. I'll opt out so others may try.

Customer: replied 11 months ago.
Customer: replied 11 months ago.
ok so an update to my issue. First the wire has 3 volts on it,i verified with another truck on this. Second I still have the problem of the scanner not powering up when I plug it in on the truck. The problem with the engine is at startup it will not idle up for the first 30 seconds, I installed a known good IAC but the pintel inside the truck does not open and stay open for startup. so my problem is again it will not idle up when starting the truck.