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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: 441146" data-attributes="member: 21229"><p>that is a fixed CPS (new name CKP) there, it is Pnp bolt on.</p><p>the FSM has errors, it does now cover the spark coil. at all , 8w pages. only the 4.2, is covered, fully.</p><p>that test lamp is no good if it is LED.</p><p>only a voltmeter tells the truth. </p><p>key on tests and cranking , the ICM power pin must have power.</p><p>ICM socket 1</p><p>A to B, check voltage with meter leads A to B. ( this will find if power or ground to the ICM is bad.</p><p>the LED may work much better , at Socket 2, from Socket1 B to socket 2B, the LED may be fast enough to see it blink fast, with the firing signal., cranking,</p><p>I use scope to see S2B flash. but and LED is fast, so may blink fast. cranked.</p><p>if S2B blinks and the spark coil is dead the ICM is bad. (assumes S1A to S1B has power cranking)</p><p>I am not sure how the B+ relay works. to the PCM</p><p>it is a latching relay and most latch up cranking, once key turns on , I presume it latches up, and allows PCM to say with full power.</p><p>Rockauto ships world wide, I think. </p><p>make sure the HV coil primary shows like 10 ohms</p><p>and the HV PIN lug (secondary) from hug lug to ,small MINUS lug is like 10,000 ohms. if either fail for infinity or 0 homes the spark coil is bad.</p><p>primary is tiny pin - to pin + tiny.</p><p>if S2B is dead, the cps/ckp is dead.</p><p></p><p>the CPS is not a hall sensor it has no power.</p><p>it is just a 2 pin coil pickup, sensor. and the signal is very weak. the connections must be perfect or it fails.</p><p>it just may be the ground to all of the above are bad, (loss,rusty,or too greasy ) </p><p></p><p></p><p>rock</p><p></p><p>[URL unfurl="true"]https://www.rockauto.com/en/catalog/jeep,1989,wrangler,2.5l+150cid+l4,1184879,ignition,ignition+control+module+(icm),7172[/URL]</p></blockquote><p></p>
[QUOTE="deadpool1, post: 441146, member: 21229"] that is a fixed CPS (new name CKP) there, it is Pnp bolt on. the FSM has errors, it does now cover the spark coil. at all , 8w pages. only the 4.2, is covered, fully. that test lamp is no good if it is LED. only a voltmeter tells the truth. key on tests and cranking , the ICM power pin must have power. ICM socket 1 A to B, check voltage with meter leads A to B. ( this will find if power or ground to the ICM is bad. the LED may work much better , at Socket 2, from Socket1 B to socket 2B, the LED may be fast enough to see it blink fast, with the firing signal., cranking, I use scope to see S2B flash. but and LED is fast, so may blink fast. cranked. if S2B blinks and the spark coil is dead the ICM is bad. (assumes S1A to S1B has power cranking) I am not sure how the B+ relay works. to the PCM it is a latching relay and most latch up cranking, once key turns on , I presume it latches up, and allows PCM to say with full power. Rockauto ships world wide, I think. make sure the HV coil primary shows like 10 ohms and the HV PIN lug (secondary) from hug lug to ,small MINUS lug is like 10,000 ohms. if either fail for infinity or 0 homes the spark coil is bad. primary is tiny pin - to pin + tiny. if S2B is dead, the cps/ckp is dead. the CPS is not a hall sensor it has no power. it is just a 2 pin coil pickup, sensor. and the signal is very weak. the connections must be perfect or it fails. it just may be the ground to all of the above are bad, (loss,rusty,or too greasy ) rock [URL unfurl="true"]https://www.rockauto.com/en/catalog/jeep,1989,wrangler,2.5l+150cid+l4,1184879,ignition,ignition+control+module+(icm),7172[/URL] [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
Non starting after new thermostat and heater core flush
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