2003 Mercury Mountaineer will not start/ no communicati


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2003 Mercury Mountaineer will not start/ no communication/ fuse #41 continues to blow

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Auto Repair Home>> Automotive Repair>> Automotive Wiring and Electrical

dylan86
New User

Jul 31, 2016, 1:13 PM

Post #1 of 3 (2068 views)

2003 Mercury Mountaineer will not start/ no communication/ fuse #41 continues to blow	Sign In

I got a 2003 Mercury Mountaineer V8 4.6 that will not start or turn over. Key turns but vehicle will not start. The starter has been replaced and the battery has tested good. There is also no communication when connected to the obdII connector. I also have found out the #41 fuse continues to blow. I will replace it and it will blow when the key is turned to the start position. This is the fuse that controls the HEGO, VMV, CMS and PTEC. I have found the abbreviated acronyms Ford uses but have misplaced them. I believe this fuse controls the PCM, the 02 sensors, the evap sensors and something else. Don't quote me on that as I don't know for sure. I have looked at the wiring and everything looks okay so far. A common issue is the 02 sensors shorting out on the exhaust but that doesn't seem to be the issue. Any help would be greatly appreciated.

kev2
Veteran
kev2 profile image

Jul 31, 2016, 3:11 PM

Post #2 of 3 (2061 views)

Re: 2003 Mercury Mountaineer will not start/ no communication/ fuse #41 continues to blow	Sign In

1st suspect is always anything not from ford/mercury aftermarket add on etc.
Fuse 41 battery fuse box is a 15amp.
heater circuit all 4 o2 sensors..
Vent valve... part of EVAP
EVR, vac reg valve... part of EGR
Vapor management, part of EVAP
PCM power relay
were there any codes or issues before the fuse blowing?
I would start with o2 sensors..

dylan86
New User

Aug 3, 2016, 11:06 AM

Post #3 of 3 (2026 views)

Re: 2003 Mercury Mountaineer will not start/ no communication/ fuse #41 continues to blow	Sign In

Hey Kev. Thanks for the assistance. Everything you mentioned has been checked outside of the EVAP system which I plan on looking at today. There were no codes I am aware of before the fuse blowing. The check engine light was not on either. Now, there is no communication when connected to the obdII port with a scan tool. As far as I know, the car was running well with no symptoms prior to my dad stopping somewhere briefly. His car was in the shade during this time and when he came out there was nothing. I will keep you posted.

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