Administrators Moses Ludel Posted July 15, 2017 Administrators Share Posted July 15, 2017 Here is 1987-90 Jeep YJ Wrangler and Jeep XJ Cherokee/MJ Comanche 2.5L TBI diagnostics information in PDF form. The first document includes all sensor and switch tests plus adjustments that affect engine tune, idle and reliability. Wiring schematics and ECU pin locations, test plugs and diagnostics included. Jeep 2.5L TBI Complete Diagnostics-Sensors-Switches.pdf Jeep 2.5L TBI ECU Inputs and Outputs.pdf Jeep 2.5L TBI MAP Sensor Test.pdf Jeep 2.5L Timing Chain and Tensioner.pdf Jeep 2.5L Valve Timing Check.pdf Jeep YJ 2.5L TBI Sensors and Pinout.pdf YJ Wrangler 2.5L TBI Wiring of WOT to ECU.pdf Jeep YJ 2.5L ISA Wiring Diagram.pdf 1987-90 2.5L TBI Intake Manifold and Sensors.pdf 1987-90 YJ Wrangler 2.5L TBI Emissions System Parts.pdf YJ Wrangler Fuel Filter and Guard.pdf 2.5L TBI ISA Motor Adjustment.pdf Used in conjunction with the many forum exchanges (search under "All Content" and "2.5L TBI" in the search box), plus the Jeep 2.5L TBI troubleshooting article at the magazine website, this information will help solve your Jeep YJ Wrangler or XJ Cherokee 2.5L TBI troubles. In references, the Model 81 is the Jeep YJ Wrangler. The Model 60/70 is the XJ Cherokee and MJ Comanche Pickup. Moses Quote Link to comment Share on other sites More sharing options...
Aspenyj Posted August 15, 2017 Share Posted August 15, 2017 Mr Ludel, Thank you for posting this data! I had to move suddenly when my 90 yj was in the middle of a rebuild. I moved from Columbus Ohio area to Aspen Co! My brother back in Ohio has my jeep back together and is fighting some gremlins. I hope this helps him out. Have a good day! Matt Ott Quote Link to comment Share on other sites More sharing options...
Administrators Moses Ludel Posted August 16, 2017 Author Administrators Share Posted August 16, 2017 You're very welcome, Aspenyj...Enjoy Colorado, you have the 4WD world at your feet! Moses Quote Link to comment Share on other sites More sharing options...
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