F9 fuse blows, captures key, cannot Move shift lever

48ROCKETMAN48

MEMBER
2007 FORD FOCUS
1.2L
4 CYL
2WD
AUTOMATIC
180,000 MILES

I have done the simple checks with the fuse out and battery connected. The high side of fuse holder F9 reads about 2400 Ohms. With battery in, I get battery voltage across the open fuse holder. Whatever is causing that fuse to blow does it when the fuse is replaced and the ignition key turned on. There is a power hold relay in the F9 circuit that evidently applies power to the ECM. How do I locate all these wires? If there are bared wires shorting to ground, I'd like to find them. What is causing the key to grab and not come out? What causes the shifter to not move? What causes the dashes in the odometer to display? Would appreciate any help. A garage gave me a wiring diagram of the F9 circuitry. Odometer display is blank after self diagnostic all dashes.

Rene Melendez

7 Replies

KASEKENNY

MECHANIC
18,907 POSTS

You are correct that you could have a shorted wire. However, due to this fuse blowing you could have a shorted component as well. There is a lot of stuff run off this fuse. That is the reason that the shifter doesn't work and it locks the key because the shifter is powered off this fuse. When that blows, the shifter locks. The dash in the odometer is the same thing. Long story short, I attached everything that is run off this fuse and when the fuse blows, all that stops working.

To figure this out, we need to try to find the component or wiring that is causing it to blow. Let's start with unhooking the IAC and then replace the fuse, turn the key and see if it blows again. Then move onto the intake runner control module. Unplug it and replace the fuse and turn the key.

If the fuse still blows then you need to remove all the relay's that are spliced into the power hold relay feed, AC clutch relay, fan relays, etc. Then replace the fuse and turn the key, see if it blows. If it doesn't then replace them one at a time, turn the key after each one and see what causes it to blow.

We need to narrow this down and this is the easiest way. Once we know what system is blowing the fuse we will be able to trace that wire or the component.

Let me know what you find and we can go from there. Thanks

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