No o2 heater voltage
Thread Starter
|
5th Wheeling
Joined: Mar 2022
Posts: 42
Likes: 4
No o2 heater voltage
Hi, I’m having a problem on my 2003 Ford F-250 v10 with no o2 heater voltage on the passenger side, driver side o2 is functioning perfectly fine just no voltage on passenger side heater
Thread Starter
|
5th Wheeling
Joined: Mar 2022
Posts: 42
Likes: 4
thanks for the suggestion, will do when I get home and will report back, I believe that it’s the ground from the pcm I believe that I’m missing, I have the 12v positive just not the ground, trying to help you understand my situation, is there a relay to the o2 heaters on the ground side?
Thread Starter
|
5th Wheeling
Joined: Mar 2022
Posts: 42
Likes: 4
interesting, could I have a bad pcm?
Moderator
Joined: Jan 2001
Posts: 56,984
Likes: 2,738
From: Virginia
If the grounding wire is good all the way back to the PCM, yes you could. Make sure you also check the 12v at the sensor plug in with a testlight, not a digital voltmeter. You need to load the circuit down when testing, the digital meter does not present enough load if there were a bad connection in the 12v wiring.
Trending Topics
Thread Starter
|
5th Wheeling
Joined: Mar 2022
Posts: 42
Likes: 4
If the grounding wire is good all the way back to the PCM, yes you could. Make sure you also check the 12v at the sensor plug in with a testlight, not a digital voltmeter. You need to load the circuit down when testing, the digital meter does not present enough load if there were a bad connection in the 12v wiring.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
Moderator
Joined: Jan 2001
Posts: 56,984
Likes: 2,738
From: Virginia
You would have to unplug the large PCM connector, find the correct wire, and then put your meter on ohms, backprobe the connector with one lead, and probe the ground at the O2 connector with the other lead. Of course you may need a scrap piece of wire to extend one of the meter leads to reach. You should get a reading very close to the same as you get by just touching the meter leads together, very close to zero ohms.
Thread Starter
|
5th Wheeling
Joined: Mar 2022
Posts: 42
Likes: 4
You would have to unplug the large PCM connector, find the correct wire, and then put your meter on ohms, backprobe the connector with one lead, and probe the ground at the O2 connector with the other lead. Of course you may need a scrap piece of wire to extend one of the meter leads to reach. You should get a reading very close to the same as you get by just touching the meter leads together, very close to zero ohms.
Moderator
Joined: Jan 2001
Posts: 56,984
Likes: 2,738
From: Virginia
The second diagram in the post #5 above shows it as pin 93 and 94.
Thread
Thread Starter
Forum
Replies
Last Post
Travistjm1
1999 - 2016 Super Duty
2
Jun 23, 2013 06:35 PM
53choptop
1948 - 1956 F1, F100 & Larger F-Series Trucks
5
Nov 11, 2003 08:52 AM