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I just bought this truck. The truck still had the red brake switch w/ the fused recall harness on it. The switch was leaking and one of the fuses was blown. I replaced the switch with the revised switch. The cruise control still isn't working. I haven't bought a Haynes manual for the truck yet, so I am not sure where to begin. Thanks for the help all.
Here is a diagram of the Speed Control circuit before the recall harness and fuse was added. The added fuse is inline between Fuse 13 and the Brake Pressure Switch.
Here is a Troubleshooting guide:
If you have power on Pins 7 & 9 (Key needs to be in the Run position) and no power on Pin 4 then you need to follow the guide to verify the switches on the steering wheel are getting to the Speed Control servo. As Sandy alluded to many times the clock spring behind the steering wheel is broken. Tends to affect horn and Speed Control. The first diagram shows the older style brush assembly behind the steering wheel. If your truck is a Light Duty F250 then it is using the clock spring setup. If you have a F250HD then your truck uses the brushes.
If the power is good and the signals from the switches are good, you have a bad servo.
Here is a pin-out for the Speed Control servo connector C216:
Wow, that is a lot of information. I appreciate you rla2005. Will take a little longer to digest and troubleshoot. It is so frickin muggy outside and it keeps raining.
Today I got my 91 out for one of the first times since I bought it. I tried the cruise and it didn't work. I tried the horn and it worked. I started depressing all the cruise buttons since it may have never been used. After about 5 pushes of each button, I tried it again and it is working great now. Worth a try if you haven't done it. You can always take the buttons off and make sure there is no rust or anything not allowing it to make a good contact. I hope it works for you. Sandy
Hmm... that's an easy one. Maybe I'll be that lucky. Not likely. I also have a code 452 (VSS signal). Found that out today with a code reader. Perhaps the code is related to the cruise? Does the cruise control use a signal from the VSS?
I miss the old cars. 3 vacuum lines, and 4 wires to the engine.
Hmm... that's an easy one. Maybe I'll be that lucky. Not likely. I also have a code 452 (VSS signal). Found that out today with a code reader. Perhaps the code is related to the cruise? Does the cruise control use a signal from the VSS?
I miss the old cars. 3 vacuum lines, and 4 wires to the engine.
As I recall, yes it does. I didn't get into it since mine was the clock spring.
Just checked and I had this bookmarked:
Since the transmission speed sensors monitor the input and output shaft speed, it also has a hand in monitoring the cruise control. When the sensors fail to deliver accurate data to the onboard computer on your car, truck, or SUV, the powertrain control module (PCM) will send an error code to the vehicle’s ECU. As a safety precaution, the ECU will shut down the cruise control and render it inactive.
A faulty VSS signal will not prevent the speed control from activating assuming the signal is not below ~30 MPH. Once engaged if the implied vehicle speed signal is outside of the set point tolerance it will deactivate.
There is no output shaft speed sensor on the OP's truck nor does the powertrain control module (PCM) have the interface or ability to shutdown the speed control servo on this vintage truck. Two completely discrete sub-systems. The only common tie point is the buffered VSS signal via the PSOM. Again the PCM has no control over the speed control system. The same applies for the vice versa on an OBS truck.
The cruise on my long parked f350 didn't work when I left LA headed for home but worked fine after we cleared Las Vegas... just kept on punching those buttons until it came alive.
Drove the truck for a 100 mile round trip today, 50 miles each way with truck sitting for 4 hours between. Get on the highway, try the cruise, it worked! Set at 65 mph for 10 miles. At that point I pushed the Coast button 5 times to drop the speed 5 mph (slower car in front of me) and it shut itself off. Then the light turned red (only light for miles), came to a stop and off of the light it shifted hard. Cruise wouldn't work for the next 20 miles or so. Tried it again and it worked again, worked the rest of the trip. Worked on the return trip. Didn't shift hard again. Overdrive light never flashed. Haven't checked the codes yet. Never did look at the VSS sensor.
With this new data, is there any specific item I should look at?
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