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73-87 Chevy _ GMC Trucks => Electrical => Topic started by: Fairlane514 on June 01, 2015, 10:07:48 am

Title: Unk pressure switch
Post by: Fairlane514 on June 01, 2015, 10:07:48 am

85 C10…..There is a pressure switch on the power steering hard line that is mounted to the front drivers side frame horn.  What is its function?


Thanks

Title: Re: Unk pressure switch
Post by: bd on June 01, 2015, 11:22:22 am

The switch provides feedback to the engine ECM when the steering is heavily loaded (generally full lock) to assist with idle speed management.

Title: Re: Unk pressure switch
Post by: Fairlane514 on June 01, 2015, 12:57:33 pm

Thanks, Rich…..The original distributor is no longer in this particular truck, so I guess the switch is not needed

Title: Re: Unk pressure switch
Post by: bd on June 01, 2015, 01:18:07 pm

I've never encountered that switch in service, so I don't know how much, if any, the effect will be if it's removed.  Until you questioned it, I actually thought they were used only on 6 cylinder applications.

Title: Re: Unk pressure switch
Post by: Fairlane514 on June 01, 2015, 02:01:15 pm

This is a 85 Custom Deluxe, V8 truck……I have never seen one before. Its unplugged now, didn't seem to effect the operation.