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2000 7.3 EOT read 272* with engine cold new Ford sensor only getting 3.95 volts at sensor plug and at the 42 pin connector from PCM should be 5 volts, dropping 1 Volt some where I disconnected all the sensors that share this voltage IAT,EBV,ICP,IPR,MAP no change. I left the EOT unplugged and the truck runs good I'll run it like this until someone can tell me was going on. Thanks for looking.
KOEO, what is the voltage to the sensor, using the PCM Ground Circuit? And, what is the voltage at the PCM? Using the PCM Ground Circuit. Also, the Transmission uses this circuit. So, you could have resistance in that side as well.
PCM:
Pin#37 OR/BK is the PCM 5v Reference
Pin #25 PCM / Circuit Ground
I'm getting 3.95 volts from EOT plug to battery ground same voltage from 42 pin connector pin 17 which I think is pin 38 at PCM. Thanks
I'm assuming its an automatic Trans?
What are you viewing the PID on? Scanner, gauge?
The purpose of checking at the PCM is to eliminate both the PCM and wiring as the fault.
You should be checking it at the PCM Ground for the most accurate reading. Just sayin...
The Speck on the EOT is "It should change from a higher voltage (2.6V) (this is the SIGNAL side) for a cold engine, to a lower voltage as the engine warms up (0.6V)" 210*F. The input voltage can be anything over 2.6V.
You may have a defective sensor. OR corrosion or bad connection at the sensor.
I would advise against driving the vehicle until you get it figured out. The EOT also controls other functions.
Higher the voltage, lower the temperature. If he's stuck at 3.94 the sensor would be suspect followed by the wiring.
Also, just FYI there is app called Tiny Take by Mango which works great for capturing screen data. Does parts, whole screen, crops, many different formats, etc.
I have manual trans. the sensor is new Ford product. thanks
*New* doesn't mean it isn't defective. What was wrong that made your change the sensor in the first place? Did the previous sensor show the same issue?
VOM - Volt/Ohm Meter. It sounds like the voltage is right on a cold truck, if cold is close to 55-65 degrees F.
I assume you did this without taking the 42-pin connector off. For those wondering, taking the connector off will open the circuit and you will not get sensor output voltages.
The stock sensor was reading high I replaced it with a sensor from auto parts store same high reading, replaced it with new Ford sensor same problem. I discovered the voltage to the sensor was only 3.95volts unplugged. Thanks
I checked two 7.3's today (actually showing someone how to do it and why to check at the PCM). You have either a bad new sensor OR incorrect sensor for your truck.
