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Jeep Wrangler YJ
YJ General Discussion
95 YJ crank, no start
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<blockquote data-quote="deadpool1" data-source="post: 440945" data-attributes="member: 21229"><p>now I will re-post my ASD test photo.</p><p></p><p>if the engine does not start and stay running over 3 seconds (the ASD rule)</p><p>and spark and fuel is lost both , that is ASD doing that.,</p><p>to prove ASD (means PCM commanded) is going deEnergized (ASD relay ) after 3 seconds</p><p>we use a jumper wire to slot 24 ASD cavity pin 24 per this way</p><p></p><p>IF ASD does not drop then we work spark dead or fuel dead. spark is first if dead always.</p><p>the PCM cuts both relays when the PCM is not happy via wire yellow K51</p><p></p><p>if pin 24 goes dead 0v, at or after 3+ seconds, the ASD did drop (more specifically PCM did it)</p><p>then we fix that. (why is PCM not happy) </p><p>it is that simple my tests. </p><p>I find a super small wire, say 3 foot long. and strip both ends back 1/2" or so</p><p>with ASD relay pulled, I insert the wire to cav,24 this is ASD OUTPUT PIN.</p><p>Then I put the ASD relay back crusing my bare wire in to pin 24.</p><p>next:</p><p>person 1 cranks, (dead engine now) cranks for 10 full seconds, for sure 5 at least.</p><p></p><p>person 2, watches the meter sees it go to 11 to 12voltes, less is A142 overload</p><p>at the 3 second mark in real time cranked the PCM sees A142 , cavity 24 is too low it cuts the ASD relay dead. at pin K51 yellow wire</p><p>this means you get to find the short(or overload) on the A142 wire, pulling all parts on the feed until the ASD monitor is happy.</p><p>This is one way to find it and not have to guess 10 parts that can fail and a bunch of old wire.</p><p>[ATTACH=full]122433[/ATTACH]</p><p></p><p></p><p>I check all fuses. not ABS , I have none</p><p>and no A/C fuses mine is custom now.</p><p>check all fuses, related to the PCM and spark and fuel and all sensors to the PCM.</p><p>per the FSM schematics.</p><p>fuse in cab and PDC infront of the main battery.</p><p>make sure no fuses are blown . is best on any car made, failing.</p><p>fuse are what stop wiring <span style="color: rgb(184, 49, 47)">fires</span> that might reach fuel lines so is a serious matter, fuses.</p><p>never us oversized Amps fuse EVER.</p><p>I use the meter ground at engine metal bare. </p><p>the side if the engine has this (right side ,drivers perspective USA) has huge ground wire bolt stud, keep clean and tight or all hope ends</p></blockquote><p></p>
[QUOTE="deadpool1, post: 440945, member: 21229"] now I will re-post my ASD test photo. if the engine does not start and stay running over 3 seconds (the ASD rule) and spark and fuel is lost both , that is ASD doing that., to prove ASD (means PCM commanded) is going deEnergized (ASD relay ) after 3 seconds we use a jumper wire to slot 24 ASD cavity pin 24 per this way IF ASD does not drop then we work spark dead or fuel dead. spark is first if dead always. the PCM cuts both relays when the PCM is not happy via wire yellow K51 if pin 24 goes dead 0v, at or after 3+ seconds, the ASD did drop (more specifically PCM did it) then we fix that. (why is PCM not happy) it is that simple my tests. I find a super small wire, say 3 foot long. and strip both ends back 1/2" or so with ASD relay pulled, I insert the wire to cav,24 this is ASD OUTPUT PIN. Then I put the ASD relay back crusing my bare wire in to pin 24. next: person 1 cranks, (dead engine now) cranks for 10 full seconds, for sure 5 at least. person 2, watches the meter sees it go to 11 to 12voltes, less is A142 overload at the 3 second mark in real time cranked the PCM sees A142 , cavity 24 is too low it cuts the ASD relay dead. at pin K51 yellow wire this means you get to find the short(or overload) on the A142 wire, pulling all parts on the feed until the ASD monitor is happy. This is one way to find it and not have to guess 10 parts that can fail and a bunch of old wire. [ATTACH type="full"]122433[/ATTACH] I check all fuses. not ABS , I have none and no A/C fuses mine is custom now. check all fuses, related to the PCM and spark and fuel and all sensors to the PCM. per the FSM schematics. fuse in cab and PDC infront of the main battery. make sure no fuses are blown . is best on any car made, failing. fuse are what stop wiring [COLOR=rgb(184, 49, 47)]fires[/COLOR] that might reach fuel lines so is a serious matter, fuses. never us oversized Amps fuse EVER. I use the meter ground at engine metal bare. the side if the engine has this (right side ,drivers perspective USA) has huge ground wire bolt stud, keep clean and tight or all hope ends [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
95 YJ crank, no start
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