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The VSS should be unplugged when testing the wires. So should the PCM.
Ok so then I did it correctly, I will begin to remove PCM today to get part number and start looking for replacement. If anyone has recommendations on where to get the PCM I'm open to suggestions
The VSS should be unplugged when testing the wires. So should the PCM.
I pulled the pcm this morning and I found one from Flagship One website, it is the correct part number and claims to have a lifetime warranty and is pre programmed and updated based on my vin number for $165.00 free shipping. Does this sound about right?
I sure would run through a few pinpoint test steps for the VSS before replacing the processor
You had the cluster out when checking continuity back and forth with the VSS? (checked the instrument cluster connection and wiring)?
I used to see one wire break and fray inside the rubber insulation at the VSS connector
They would sometimes test good until you wiggled (interrogated) the wires
I hope the processor fixes it, looks like you've jumped through most of the hoops
Well the new PCM came in today, they programmed it to my VIN and they tested it. I put it in and it still does the same thing, right around 28 mph the speedometer starts to bounce and the weird shifting is back. Still no codes after test drive just like last time. The only thing is the abs light is on in the dash but to be honest I do believe that's been on since I've owned the van....I have no clue what to do now
This on-going issue with the cluster seems to strongly suggest that it is the problem. On eBay one can find several repair facilities that supposedly specialize in automotive electrical devices such as these older version instrument clusters. There might also be a few gently used clusters with guaranteed function upon installation in your vehicle.
Agreed, no codes means you are doing diagnosis by symptom
That will send you into instrument cluster testing
The ABS lamp on needs to be diagnosed too
The problems may be replated
You say no codes
Makes me wonder what scan tool you are using and if it is adequate
I have my own personal experience with an errant cluster. to wit: installing a brand new never used cluster fitting a late 90's diesel fuel cluster into my 2000 E-250 gasoline-fueled van. At the time I had no idea or clue how integral the cluster was to the van's proper operation.
Immediately upon the first test drive my speedo wasn't working and the 4R70W wouldn't shift by itself.
Initially I was seeking to correct two of the cluster's temperature gauges that had failed, found the "wrong" cluster on eBay and foolish me assumed they'd be interchangeable without issue. Live and learn I guess?
At the beginning of this thread Mark K recommended you check the wiring between the VSS , PCM and instrument cluster (IC). I think you really need to look at this before you do anything else. Your symptoms scream of a wiring problem.
4R70W
Note the PCM gets the signal from the output speed sensor OSS. Then it calculates speed and sends the proper signal to the instrument cluster (see A30 instrument cluster on the second drawing). The wiring goes through a splice S133 and changes colors from Yellow/light blue to red/white. It also has connectors on both ends. I don't know what the signal format is.
You will need to remove the instrument cluster to check continuity on the wires and connectors. Since you also are having problems turning on the OD I suspect wire damage because the switch sends the button ON signal to the PCM and it returns a signal to turn on the light.
A cheap way to test for a bad IC is to grab one from Pick and Pull for about $65. This had the added bonus of learning how to remove the IC before you try it on your van. Plug in the "new" IC and see what happens.
Here is the link to the free wiring and service manuals. https://charm.li/Ford%20Truck/
The service manual information is not very useful but you may find explanations of how things work.
At the beginning of this thread Mark K recommended you check the wiring between the VSS , PCM and instrument cluster (IC). I think you really need to look at this before you do anything else. Your symptoms scream of a wiring problem.
I worked closely with Mark on all his recommendations and I tested the continuity and that was just fine and there was no resistance etc... also it is a 2002 so there is no PSOM on the cluster that is why Mark said it would not have anything to do with this issue
The cluster displays the speed. The speed is not working. Don't get caught up in trying to explain how a suggested failure is possible before attempting a fix. Measure , test, verify results and fix. Then reverse engineer how the symptoms matched the failure.
We have all been fooled by a problem but perseverance and checking things that, on the surface didn't make sense, works.
You will need to remove the instrument cluster to check continuity on the wires and connectors. Since you also are having problems turning on the OD I suspect wire damage because the switch sends the button ON signal to the PCM and it returns a signal to turn on the light.
I'm sorry if I wasn't clearer in the beginning but I never said the OD didn't work I said the TCIL was blinking and that in of itself is an indication of a trouble code such as a 'check engine" light. The transmission shifts find until the speedometer starts bouncing then I have problems but once the bouncing stops the problems go away. I have not looked past things just to say they aren't a problem, I had the cluster out and I tested the 4 jumpers and there is continuity with no resistance and the one resistor checks out to 390 ohms
I may not be an electronics expert but I do know how to read a d follow direction from others once I feel I'm on the same page as that person.
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