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Jeep Wrangler YJ
YJ General Discussion
Non starting after new thermostat and heater core flush
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<blockquote data-quote="deadpool1" data-source="post: 441150" data-attributes="member: 21229"><p>I found this mess is under fuel. chapters 14. and helps.</p><p>the CPS is there</p><p>the ICM too</p><p>the ground i think is the dip stick tube mount,</p><p>the coil wiring in my book is not ever told. only vaguely here.</p><p>PCM pin 27 must plus 0 to 5v. or the ICM will be OFFLine (inop)</p><p>all ECu grounds must be good.</p><p>pin 3 ecu, is ign key run turned on key. 12vdc to ICM and ECU. </p><p>pin 27 to ICM pulse 0v 5v 0v 5v as you crank, if not the PCM is not seeing the CPS< assumes B+ good and all grounds and power pins seen here are good.</p><p>if 5vdc happens the ECU is NOT DEAD.,, means has power) the ECU creates 5vdc from 12vdc pin 8 or 3.</p><p>the purpose of B+ is so if engine stalls on the fly, we can let the cars momentom restart it in gear. B+ only ends key off.</p><p></p><p>[ATTACH=full]122511[/ATTACH]</p></blockquote><p></p>
[QUOTE="deadpool1, post: 441150, member: 21229"] I found this mess is under fuel. chapters 14. and helps. the CPS is there the ICM too the ground i think is the dip stick tube mount, the coil wiring in my book is not ever told. only vaguely here. PCM pin 27 must plus 0 to 5v. or the ICM will be OFFLine (inop) all ECu grounds must be good. pin 3 ecu, is ign key run turned on key. 12vdc to ICM and ECU. pin 27 to ICM pulse 0v 5v 0v 5v as you crank, if not the PCM is not seeing the CPS< assumes B+ good and all grounds and power pins seen here are good. if 5vdc happens the ECU is NOT DEAD.,, means has power) the ECU creates 5vdc from 12vdc pin 8 or 3. the purpose of B+ is so if engine stalls on the fly, we can let the cars momentom restart it in gear. B+ only ends key off. [ATTACH type="full" alt="1980schem2.jpg"]122511[/ATTACH] [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
Non starting after new thermostat and heater core flush
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