Got a code on my Edge Insight for Fan Speed Sensor, no Signal. Cruised around the Tech Folder, didn't see any thing there that spoke to this. Can someone point me in the direction of the sensor so I can check connector(s) if they exist and the location of the sensor itself. hoping this maybe a "in the driveway" fix!

Thanks much!

Eric

 

Just under the top radiator hose between the motor and radiator you'll see a wiring harness connector about as big around as a quarter and 3 inches long. That's the fan harness. Check the wiring for cuts/breaks and check the fan to see if it wobbles. There isn't a sensor to check as it's internal to the fan clutch assy.

 

Well the fan is solid...don't like the sounds of having a fan that wobbles! I will see if I can find that today. Thank you very much!

 

The fan wobble is more of an indication of a water pump problem than a fan problem, but it's been documented that the fan can cut the wiring harness to the fan sensor/clutch for that reason. Posting the specific code can also be helpful .

 

Well I don't like the sounds of that. I have had EGR/Oil Cooler changed last October, as well as a new EGR Valve. Most recently I had the fitting changed out on my HPOP. When the HPOP work was done, the technician mentioned that code. I did not have a means until recently with installing the edge insight to check any trouble codes.

I have noticed that, what sounded like a fan intermitantly turning on an off when the engine was under load, is no longer doing so, or I am not hearing it.

A water pump failure would make me sad....(Said in a whiny tone). I hope that it is a damaged wire or pushed pin. Looks like Friday, when I have a day off I will dig around and find out what the problem is.

Perhaps when work was being done, there may have been a work induced problem.

Finally, if in fact there is a fan/water pump issue, aside from fan wobble is there anything else that would manifest itself to lead me to suspect the water pump? For example a point by the Edge that would indicate a problem?

I assume that I should be able to put front to back / back to front pressure on the fan blades and detect movement / No Movement?

Eric

 

OOPS! The code is P0528.

 

It won't take you more than 10 seconds after you open the hood to see if you have a loose water pump. It should be obvious. The wiring maybe not so much. I don't know the specifics of that code more than it's a fan speed sensor. I'm going to see if Cheezit will weigh in.

 

Thank you very much. Some update with this. I decided to take a look this afternoon prior to leaving work.

I tow a 11.5K fifth wheel (which we love!) When I got under the hood. I noticed two things. The fan speed sensor connector was broken off its bracket. I opened it and there may have been some light corrosion on the pins. Hard to see the sockets. I cleaned them up, reconnected the connector and zip tied it to the bracket. I pull tested the wires individually on the sensor side. Wires seemed tight. There wasnt enough room to do the PCM side of the connector at the time.

I cleared the code, which had been steady and restarted the truck. The code remained clear ran the truck, had EOT of 198 and oil temp of 200 running at 75-80 MPH. Stopped truck and restarted after about 10 minutes and code reappeared. So I think I will spend some more time on cleaning and recheck.

The second issue is chalky residue in the area around the Degas bottle. I noticed also coolant level was low. I added about 2 pints of motorcraft gold and brought it to the minimum level which I understand is actually the Max level. I do not have the replacement level decal.

I did see a thread on the old Degas bottle cap and mine is old.

I THINK that the fan sensor loss of signal is contributing to high coolant temp that coupled with the old cap may becausing this.

When owners refer to "puking" is this what this is?

Good stuff so far! Thanks!

Eric

 

I would first replace the degas bottle cap then take it for a run a good long run. Hopefully you have a ScanGauge or other gauges that can give you oil and water temps. Check your delta and they SHOULD be (on a level road) within 15* of each other. If the oil gets more than 15* higher than the coolant, you prob have bad head gaskets.

 

Since I have had the edge, I watch trans, oil, engine, and EGT. Oil and engine temps are almost always matched on the flats. Initially, until NOT is reached I have seen as much as a 12 degree Delta but that is only on acceleration and only until the engine is fully warmed.

So for an $11 part, I'll change the cap out, clean up the white spots and check it all out. I have a camping trip coming up at the end of September and will be doing some hills. I will get some data there for sure.

I want to get this sensor working again because I still don't think I understand what its impact may be on cooling or reduced cooling and I believe that in my situation, towing, it would be a good thing to have the fan stepping as necessary.

Do you know if the sensor is a square wave generator? Seems to me that it could be.

Eric

 

The sensor is integral to the fan clutch so it's either a wire or the fan clutch. I'm still betting on a wire at this point.

 

I put about 100 miles on the truck today. Averaged about 192 oil and engine temp. Inspected the area I cleaned of residue and saw no indication of coolant. Still have fan code and will go back at that this afternoon.

Will now keep an eye on engine temp under load. For my 5vr weight, anyone out there have a temp they normally see while towing? Hills and flats?

I am actually liking the tinkering. Gets me smart on my vehicle and engine!

Eric

 

Still getting P0528. Took the connector back apart, cleaned pins and sockets with contact cleaner. Did get some more corrosion off of the pins. Sockets seem okay. No loose wires. This is beginning to bug me. I will be digging into schematics next to see where I am losing the signal.

If anyone has some troubleshooting input or experience with this sensor, wiring, connector, I would appreciate it. Thanks! Eric

 

I am going to break the fan issue out into a seperate thread "P0528, Fan Speed Sensor: No Signal"