1995 E150 - Code 452 “Open speed sensor circuit” diagnosis help (PSOM?)
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
Just unplug the PCM and the PSOM connector.
The measure the resistance from pin #3 to pin #6, #37 and #40.
Your DVOM on the ohm scale should measure greater than 10,000 ohms (an open).
In other word you are checking to make sure these wire are not shorted together.
No need to remove pin #3 at this point.
/
Thread Starter
|
Junior User
Joined: Jul 2019
Posts: 56
Likes: 0
That was the right way to do it.
Not for DS3.
Just unplug the PCM and the PSOM connector.
The measure the resistance from pin #3 to pin #6, #37 and #40.
Your DVOM on the ohm scale should measure greater than 10,000 ohms (an open).
In other word you are checking to make sure these wire are not shorted together.
No need to remove pin #3 at this point.
As long as you can get to the PCM pins with the PCM disconnected you will not need one. But they do make life much easier.
/
Not for DS3.
Just unplug the PCM and the PSOM connector.
The measure the resistance from pin #3 to pin #6, #37 and #40.
Your DVOM on the ohm scale should measure greater than 10,000 ohms (an open).
In other word you are checking to make sure these wire are not shorted together.
No need to remove pin #3 at this point.
As long as you can get to the PCM pins with the PCM disconnected you will not need one. But they do make life much easier.
/
Thread Starter
|
Junior User
Joined: Jul 2019
Posts: 56
Likes: 0
Am I testing this at the PCM connector or the PCM itself? Not getting any resistance reading at all between 3 and 6 at both the connector and PCM. No reading at connector for 37 and 40. 300 ohms at the PCM between 37 and 40
Thread Starter
|
Junior User
Joined: Jul 2019
Posts: 56
Likes: 0
Shouldn't the meter respond to the connection and show 0? Mine is just displaying a 1 in the left side when testing.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
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
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
I do not know what meter you are using so I can not say with out its make and model number.
Thread Starter
|
Junior User
Joined: Jul 2019
Posts: 56
Likes: 0
I'm not 100% certain. For DS2, ("Measure resistance between Test Pin 3 at the breakout box and PSOM(+) circuit at the PSOM vehicle harness connector.") do I just test from pin 3 on PCM connector to PIN 1 (battery) on PSOM connector?