Another Cruise Thread (Checked the normals)

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Jul 5, 2021 | 07:39 PM

cdgoza

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Joined: Jul 2021

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Another Cruise Thread (Checked the normals)

So I have spent this weekend chasing the ghost which is my inoperable cruise. 1994.5 F350 2wd 5 speed. I've had the truck for about a year now and this is the first real issue I've had. It started while pulling an enclosed trailer where my cruise would kick off with lights on or hitting a turn signal. No biggie just figured I had a turn signal out. Checked all the lights on the truck they were good. Not a perfect trailer so attributed it to that. Got back home and dropped the trailer and headed in to town and still no cruise. Since then I have done the following:

All my lights are good

I have already changed the pressure switch on the master cylinder and the sensor on the rear end.

Jumped the two wires on the clutch safety switch that kill the cruise with no success.

Parking brake switch seems to work fine as the light comes on and goes off just like it's intended.

Rewired everything on my horn pad. My horn has worked the entire time I've has this issue.

All fuses are good

Leaning toward my horn pad buttons on my ignition switch as I've read of a couple instances that it's caused an issue.

Open to any ideas and I'm sure I've forgotten something I've done.

Jul 7, 2021 | 06:15 PM

cleatus12r

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Joined: Apr 2004

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From: Reed Point, MT

You need a scan tool to look at data and see what is missing. There are a lot of things that the PCM "looks for" to enable the cruise control. You need to see that all of these change states when activated. You will chase your tail hoping to fix this so long as you don't know the one thing that can cause the PCM to inhibit cruise control operation.

BPA (brake pressure apply) switch on the master cylinder - blown fuse due to faulty switch can cause it. This fuse is in the recall harness installed at the dealer.

BOO (brake on/off) LED taillights or faulty hazard switch in the column can do it.

CPP clutch pedal position

PBA parking brake applied

All of the cruise button inputs (primarily "on" and "set accel").

VSS vehicle speed sensor input. Being a manual you will have no shift concerns if the inout is missing but the PCM needs to know what speed is desired.

Jul 8, 2021 | 05:13 PM

helifixer

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Joined: Dec 2005

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From: Chino Valley, Arizona

I feel for you, I had a problem where when I would hit a bump my cruise would shut off. that went on for about a year, then no cruise at all. I found the ford troubleshooting guide here on FTE, went through it and everything passed. I changed my pcm ( I have a spare) brake switch, vss, steering wheel, harness in column, instrument cluster ( I have a parts truck) bypassed clutch and brake pressure switches nothing helped. took the steering column out and was pulling the dash and noticed the wire for the clutch switch had a (sharp) kind of bend in it, about 1 inch from the plug. grabbed it and pulled on it and it broke apart. the wire had broken but the 2 ends touching was enough continuity to pass the test but when I would try to engage the cruise it wasn't a good enough connection for it to latch the cruise