cruise control issue

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Mar 24, 2023 | 08:03 PM

rosewoodgang

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cruise control issue

I have a 1993 F350 diesel with zf5 speed manual transmission with digital style cruise control <no vaccum> The reason for this question my cruise control will work some times and not at other times. I have the accelerator pedal that is drive by cable only with no electrical connections and no computer is this my issue? I have ohmed all wiring connections from steering colum to cruise control servo including all related switches. I have also replaced clutch interlock switch ws-5993, stop light switch sls-97, master cyclinder switch sw-6350, parking brake switch ds-339, abs wheel speed sensor 970-012, anti lock brake hydrolic unit 12-2024, abs control module and cruise control actuator servo.Checked steering colum connections including wiring,contact ring and cruise switches. Thanks for any information Harvey

Mar 24, 2023 | 08:21 PM

Prototypemech

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From: Mojave, Ca

Do you have LED Tail and stop lights?
The cruise control computer is built into the cruise control servo. It reads the speed signal from the programmable speedometer/odometer module (PSOM).

Mar 25, 2023 | 08:51 AM

rosewoodgang

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no tail lights and stop lights are incandescent style only back up bulbs are LED Thanks for info on [psom] was somewhat sure that no other computer was needed

lED

Mar 26, 2023 | 05:49 AM

tjc transport

i ain't rite

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From: Marlboro Mental Hospital.

not sure on the 93, but my pre 91 trucks with vacuum cruise modules would get real wonky when the vacuum pump was going bad.

Mar 26, 2023 | 10:53 AM

Prototypemech

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From: Mojave, Ca

I was able to fix my friends 1995 f350 cruise control by cleaning the servo connector and terminals with isopropyl alcohol and a tooth brush.

Mar 30, 2023 | 08:49 AM

rosewoodgang

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1992 and up cruise control does not use a vaccum port it is completly elestronic controled but thanks for information

Mar 30, 2023 | 08:55 AM

rosewoodgang

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I have cleaned horn ring connection and applied small amount of white lithium grease along with the connections under steering wheel/horn pad but thanks for information