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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: 441171" data-attributes="member: 21229"><p>now you have the manual, save it and keep it.</p><p>the manual is extensive and 100x better than any chiltons or haynes , door stops.</p><p>just keep in mind, read only pages for 80/81 jeeps, (means YJ in jeep jive)</p><p></p><p>forget fuel, spark is dead at the actual COIL main HV terminal, dead is dead.</p><p>fix spark</p><p>the ECU if it detects spark failing it cuts fuel dead , to prevent crash and burn.</p><p>diagnose why spark is dead.</p><p>step 1 is always, (of all grounds look ok) the battery fully charged, and good.</p><p>the trigger is tested, S2 B pin.</p><p></p><p>use an LED test lamp on the Orange wire S2B, socket 2, pin B</p><p>doing 1 test only we prove which end is failing ICM or ECU end. in just 1 simple test.</p><p></p><p>[ATTACH=full]122516[/ATTACH]</p><p>See those funny looking cross swords there, that means it goes to the DLC jack. D2 pin 9 is trigger test point at DLC #2</p><p>see on FSM sheet 59 in the code 80 pages W8 chapter . D2 IS what we call today DLC, diagnostic logic conn.</p><p>3 cent resistor and 10 cent led allows us to see the trigger flash the LED,</p><p>here is how to make and LED tester for 5v logic.</p><p></p><p>[ATTACH=full]122517[/ATTACH]</p></blockquote><p></p>
[QUOTE="deadpool1, post: 441171, member: 21229"] now you have the manual, save it and keep it. the manual is extensive and 100x better than any chiltons or haynes , door stops. just keep in mind, read only pages for 80/81 jeeps, (means YJ in jeep jive) forget fuel, spark is dead at the actual COIL main HV terminal, dead is dead. fix spark the ECU if it detects spark failing it cuts fuel dead , to prevent crash and burn. diagnose why spark is dead. step 1 is always, (of all grounds look ok) the battery fully charged, and good. the trigger is tested, S2 B pin. use an LED test lamp on the Orange wire S2B, socket 2, pin B doing 1 test only we prove which end is failing ICM or ECU end. in just 1 simple test. [ATTACH type="full" alt="icm1.JPG"]122516[/ATTACH] See those funny looking cross swords there, that means it goes to the DLC jack. D2 pin 9 is trigger test point at DLC #2 see on FSM sheet 59 in the code 80 pages W8 chapter . D2 IS what we call today DLC, diagnostic logic conn. 3 cent resistor and 10 cent led allows us to see the trigger flash the LED, here is how to make and LED tester for 5v logic. [ATTACH type="full" alt="led-tester.jpg"]122517[/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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