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How may I test the idle speed actuator in my 88s 2.5L4 MJ is still ok?

got the feeling there's no activity from it!

maybe the wiring, or the isa is broken? Changed the isa though!!

thanks from Germany!!

kalle

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500kalle...Welcome to the forums!  Here is a discussion about the ISA, there are many others.  See the July 30, 2016 exchange, I included useful PDF guidelines:  

For more discussion, go to the Search box, change the setting to "All Content", and type in "idle ISA".  You'll get a number of topics and replies related to your 2.5L TBI engine, troubleshooting, fuel pressure and diagnostics.

Moses

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Thanks, great input !!

but I fear there's an other issue with my isa, the wiring seems to be damaged and so I need a wiring Diagramm to rewire it !!

got a link to a matching Diagramm?

throttle relay is ok, so I need to know the way wiring goes from the relay to the isa!!!

is it right that throttle relay and fuel pump Relais are similar?

please help!!

thanks again!!!!

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500kalle...I generated two PDFs that you will find in our July 2016 exchange at this forum topic: 

This is the factory testing and adjustment procedure...

Moses

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