500kalle Posted March 30, 2017 Share Posted March 30, 2017 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 Quote Link to comment Share on other sites More sharing options...
Administrators Moses Ludel Posted March 30, 2017 Administrators Share Posted March 30, 2017 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 Quote Link to comment Share on other sites More sharing options...
500kalle Posted April 2, 2017 Author Share Posted April 2, 2017 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!!!! Quote Link to comment Share on other sites More sharing options...
Administrators Moses Ludel Posted April 3, 2017 Administrators Share Posted April 3, 2017 500kalle...Here is the ISA motor/actuator wiring schematic: Jeep YJ 2.5L ISA Wiring Diagram.pdf Relays at the power distribution box are similar. You should be able to confirm each relay part number from a parts search online at Mopar retailers. Moses Quote Link to comment Share on other sites More sharing options...
500kalle Posted April 3, 2017 Author Share Posted April 3, 2017 Thanks a lot !!!!!!!!! ;-) Quote Link to comment Share on other sites More sharing options...
500kalle Posted April 14, 2017 Author Share Posted April 14, 2017 Last question I hope what voltage should be on the plug to the isa? 5.2V? 12-13V? thanks!!!! Quote Link to comment Share on other sites More sharing options...
Administrators Moses Ludel Posted April 14, 2017 Administrators Share Posted April 14, 2017 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 Quote Link to comment Share on other sites More sharing options...
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