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97 ranger PCM plug chart


spanky50

Active Member
Law Enforcement
Joined
Mar 19, 2021
Messages
35
Age
54
City
muncie,in
Vehicle Year
97
Engine
4.0 V6
Transmission
Automatic
Total Lift
4" rough country
Tire Size
32" cooper STT
I have a 97 ranger 4.0 I'm looking for a chart that shows me the pins numbers on the PCM plug.
I don't have any power down at my o2. Trying to see if its a wiring problem or in the PCM.
 
O2s only have 12v for the internal heater with Key ON, just FYI, should be the light blue/orange wire on each one in 1997
The heater 12v comes from Fuse 3 in engine bay fuse box, 15amp

O2 "sensor part" generates its own voltage after its heated above 650degF, 0.1v to 0.9volt

O2s are not 5volt sensors like the other sensors on the engine

PCM does Ground the heaters so should see the Key ON 12volts on those wires at the 104-wire connector

Look here for the PIN Numbering layout: https://www.ranger-forums.com/4-0l-ohv-sohc-v6-tech-33/anyone-have-97-4-0l-ohv-pcm-pinout-139229/

Below diagram is the wiring for the 3 O2s
 

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Last edited:
thanks we know the power deal but getting no reading from any of the o2s
that plug pin code is what i was looking for.
 

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