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Ron
Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 23001
Experience:  23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
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I have a 90 for mustang with a 2.3. I was testing air charge

Customer Question

I have a 90 for mustang with a 2.3. I was testing air charge temp sensor and I believe I shorted out the positive lead to sensor. Car will start but not idle. It was working fine before I shorted out wire to sensor. I thought I might have blow a fuse but all fuses are okay. Any ideas?
Submitted: 3 months ago.
Category: Ford
Expert:  david craig replied 3 months ago.

Hi Im David, allow me some time to look up some info for your vehicle. thanks

Expert:  david craig replied 3 months ago.

heres a print to help you out

Customer: replied 3 months ago.
The printout helps a little but it didn't answer my question. I blew something a fuse relay or circuit because I have no power at the air charge temp sensor now. I need to know what I blew and where it is. Thanks
Expert:  david craig replied 3 months ago.

automatic or manual tranny

Expert:  david craig replied 3 months ago.

do you know how to read a schematic?

Customer: replied 3 months ago.
It's an automatic. I can read a schematic but I can't find anywhere that shows a relay or fuse for the air charge temp sensor.
Expert:  david craig replied 3 months ago.

there isnt one. follow the wire back thru the nss,,,,,, then in go to the starting/cahrging circuit. start looking for blown fuses fir IGN STARTER/ EEC/ etc....

Expert:  david craig replied 3 months ago.

hows it going? find a fuse blown?

Customer: replied 3 months ago.
Not yet
Expert:  david craig replied 3 months ago.

make sure you check all the fusible links also bud

Customer: replied 3 months ago.
looks like the hot wire goes directly to ecm, no fuse links.
Expert:  david craig replied 3 months ago.

no. thats the signal wire. follow it over to the right through the neutral safety switch then you can see it goes to the starting/charging circuit. thats why i wanted you to check the fusible links

Expert:  david craig replied 3 months ago.

ill send you a pic of that

Expert:  david craig replied 3 months ago.

here you go, check all of those links and fuses

Expert:  david craig replied 3 months ago.

hows it going?

Customer: replied 3 months ago.
I'm getting a signal from the ecm and I have continuity on the other side to ground .I have continuity my fuses should all be okay?
Expert:  david craig replied 3 months ago.

did you look at all the fuses?

Customer: replied 3 months ago.
Expert:  david craig replied 3 months ago.

ok

Expert:  david craig replied 3 months ago.

replace the sensor

Customer: replied 3 months ago.
My check engine light is on. I'm going to check that first. Thanks
Expert:  david craig replied 3 months ago.

ok

Expert:  david craig replied 3 months ago.

checking in to see how its going?

Customer: replied 2 months ago.
Here's where I am on the 90 ford mustang. I got a obd1 tester but I couldn't get it yo read codes. I tried doing a manual self check with the same results. The Air charge temp sensors sends a signal to computer,what sensor does that signal feed? I don't believe the air charge temp sensor is bad because it was unhooked when I shorted the circuit. Any ideas? Thanks Glen
Expert:  david craig replied 2 months ago.

its tied to all these sensors the etc,map,egr,tps

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