I have a cheaper OBD2 scanner that I tried as well, and got the same result. It powers on when connected, tries to communicate with it, but then eventually it says that it can't connect and to check the connection.
#Coolant temperature sensor location manual plus
It is an Action Autoscanner Plus (CP9580A). When I was checking out the truck, I brought my OBD2 scanner, which works on all of my other vehicles. I will post on the issue with the water temp sensor separately. The only two things "wrong" with it that I haven't been able to fix are relatively minor (water temp sensor, and OBD2 port). It was dealer maintained until 140K miles (from CarFax), so overall it is well taken care of. My F250 has about 186,000 miles on it, almost no blow-by, and is in overall great shape.
I have searched the message boards extensively and haven't found an answer to this yet (and have tried whatever I can from the posts I have found), so if there is a post that describes this and I overlooked it, my apologies! I have had my 2002 F250 7.3 for about 3 weeks, and absolutely love it! I have worked on cars for years, but this is a whole new experience and the learning curve is steep. OBD2 Port Powered but can't connect to ANYTHING Thanks for your help and any guidance/ideas would be greatly appreciated!
#Coolant temperature sensor location manual manual
Has anybody experienced the coolant temp sensor not getting power at the plug/connector? Is there a stand-alone grounding wire just for this sensor, as there isn't anything else that seems to be wrong (other than the OBD2 port getting power but not communicating with the PCM)? If it was just a ground, I assumed that I could use the voltmeter and ground to the chassis instead of the plug and I should see voltage, but I didn't.Īlso, does the engine use this coolant temp sensor to control engine parameters or a separate sensor? I believe what I found on the message boards was that the automatic used the oil temp for the PCM, while the manual transmission used the coolant temp sensor. I am trying to find a Factory service manual or wiring diagram, but haven't found one yet. I have a Haynes manual but it wasn't much help. I couldn't tell if it is part of a larger wiring harness (I assume) or if it is more of a stand-alone. I haven't been able to visually find the other end of the wires.
I also noticed the tan wire going to the sensor has some exposed wire, but it doesn't look like it is shorting out to anything. Finally (I should have done this FIRST, but didn't) I checked the voltage of the connector.nothing! So it appears that the sensor isn't getting any power. I tried shorting the connector with a resistor to see if the gauge would move, and it didn't. Therefore, I followed the advice I found on the message board and got the OEM Motorcraft sensor. I read a lot about others with similar issues, and heard that aftermarket sensors from Autozone or elsewhere look and fit the same, but don't have the same resistance values. When I disconnected the batteries and then reconnected and turned the key over the first time, the gauge went all the way to the left and right along with the other gauges, so i assume that the gauge is not defective. When I turn on the engine, the gauge goes up slightly.but never even up to the bottom line. One of the only issues I am trying to solve is the temp sensor is always on "cold". I have had my 2002 Ford F250 7.3L Automatic w/186k miles for about 2 weeks.
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