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Ron
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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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: 10 months ago.
Category: Ford
Expert:  david craig replied 10 months ago.

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

Expert:  david craig replied 10 months ago.

heres a print to help you out

Customer: replied 10 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 10 months ago.

automatic or manual tranny

Expert:  david craig replied 10 months ago.

do you know how to read a schematic?

Customer: replied 10 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 10 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 10 months ago.

hows it going? find a fuse blown?

Customer: replied 10 months ago.
Not yet
Expert:  david craig replied 10 months ago.

make sure you check all the fusible links also bud

Customer: replied 10 months ago.
looks like the hot wire goes directly to ecm, no fuse links.
Expert:  david craig replied 10 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 10 months ago.

ill send you a pic of that

Expert:  david craig replied 10 months ago.

here you go, check all of those links and fuses

Expert:  david craig replied 9 months ago.

hows it going?

Customer: replied 9 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 9 months ago.

did you look at all the fuses?

Customer: replied 9 months ago.
Expert:  david craig replied 9 months ago.

ok

Expert:  david craig replied 9 months ago.

replace the sensor

Customer: replied 9 months ago.
My check engine light is on. I'm going to check that first. Thanks
Expert:  david craig replied 9 months ago.

ok

Expert:  david craig replied 9 months ago.

checking in to see how its going?

Customer: replied 9 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 9 months ago.

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