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Jeep Wrangler YJ
YJ General Discussion
95 2.5 Idles Erratically Then Stalls at Operating Temperature
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<blockquote data-quote="deadpool1" data-source="post: 440427" data-attributes="member: 21229"><p>check engine lamp is glowing, if the flash codes are dead , that means the ECU is messed up. It must flash codes on demand.</p><p>99% of those failures ECU are just bad caps on the ECU, a $5 fix using Nichicon caps only , LOW ESR from mouser.com (wholesale distrib)</p><p>you have many problems here with this car. not just 1. so that is hard,</p><p><a href="https://wrangleryjforum.com/threads/jeep-wrangler-yj-factory-service-manuals-fsm-and-part-catalogs.27000/" target="_blank">free manual is here, our site.</a></p><p></p><p>first off all those words on the ALT and not one voltage test across the battery using real DMM meter, not the funky dash VM.</p><p>13 to 15vdc is the range.</p><p>if voltage falls near 10v the ECU goes MAD, (regs inside drop out and self reboots endless, chaos) 13vdc is min, 13vdc, is the battery FLOAT voltage.</p><p>The manual for the car is free and all alternator tests are there.</p><p>I can name 100 causes for the 2.5L MPI to stall, sure can, or I do up to 10 tests using tools,meters and hand gauges to find it.</p><p>I call this GUE$$S or TEST , what you want to do is not told nor if buying tools is in the cards or not, if not guessing is the game.</p><p></p><p>the HOT RPM hunting means the ECU is stuck on LIMPHOME mode (CEL GLOWS!), as all do in the mode the idle regulation via IAC is not on LINE.</p><p>The flash codes most work. sorry but that is a fact.</p><p></p><p>blinked out , DTC ODB1, 2 digit flash codes(DTC), like Morse code is but not the same. no 2 cars made then have the same OBD1 codes, this is JEEP codes only.</p><p>The CEL glowing is the problem</p><p>The CEL (Mil/ses) lamp glows if a major sensor is dead, shorted ,open,missing or dead as a door nail. that is all OBD1 does is report things dead.</p><p>unlike wonderful OBD2. we all know so well.</p><p>There is no EGR here (unless engine swapped alien) so no EGR stuck open and stalls. (main EGR is not there 1995)</p><p>dead ECT</p><p>dead 02 or shorted.</p><p>Dead MAP</p><p>Dead TPS.</p><p>CMP failing or CKP failing. (2 sensors cam/crank)</p><p>12vdc is really 10v or lower, ECU goes DEAD (offline actually)not dead dead.</p><p><strong><span style="color: rgb(184, 49, 47)">A142 overload detected.</span></strong></p><p></p><p>Try new caps in the ECU or learn the key on 3 times trick first. learn this trick in the manual so is not really a trick but sure does seems like it is , first time seen to most folks. (practice first before car fails.)learn the test. key on 3 times. (even my newer jeeps do it)</p><p></p><p>The ECU wants to tell you why it is failing, (it or the sensors. etc) wires shorted inputs to the ECU too will do it.</p><p>if it shuts down, the first think I do is see if the ASD relay did that, swap horn and ASD relay to see if HORN relay cures it, most times not.</p><p>The ASD drops out for</p><p>all outputs of ASD overloaded, the ECU measure the load, and if to much shuts it down, this is to stop engine fires. ok, by law too DOT.</p><p>1 of 4 injectors short out hot.</p><p>the O2 sensor wires shorted (heater) and ASD drops.</p><p>the ASD sees (a142 wire) to ALternator is shorted the ASD drops off line, engine stalls fast, all spark and fuel ends at ASD DROP.</p><p>the book free shows, how A142 wires is connected. all things on the 1 wire must not short.(overload.)</p><p>as you see I know my ECU's well. even 0bd1,</p><p>In can talk on this subject all day.</p><p></p><p>here is the a142 page I made to make it more easy. (I use a voltmeter on A142 to see if it drops just before the stall)</p><p></p><p></p><p></p><p>here is all we need on ASD see why it drops? the drawning is complex as is the functions of ECU. (to prevent fuel fires,crash and burn)</p><p></p><p>[ATTACH=full]122210[/ATTACH]</p></blockquote><p></p>
[QUOTE="deadpool1, post: 440427, member: 21229"] check engine lamp is glowing, if the flash codes are dead , that means the ECU is messed up. It must flash codes on demand. 99% of those failures ECU are just bad caps on the ECU, a $5 fix using Nichicon caps only , LOW ESR from mouser.com (wholesale distrib) you have many problems here with this car. not just 1. so that is hard, [URL='https://wrangleryjforum.com/threads/jeep-wrangler-yj-factory-service-manuals-fsm-and-part-catalogs.27000/']free manual is here, our site.[/URL] first off all those words on the ALT and not one voltage test across the battery using real DMM meter, not the funky dash VM. 13 to 15vdc is the range. if voltage falls near 10v the ECU goes MAD, (regs inside drop out and self reboots endless, chaos) 13vdc is min, 13vdc, is the battery FLOAT voltage. The manual for the car is free and all alternator tests are there. I can name 100 causes for the 2.5L MPI to stall, sure can, or I do up to 10 tests using tools,meters and hand gauges to find it. I call this GUE$$S or TEST , what you want to do is not told nor if buying tools is in the cards or not, if not guessing is the game. the HOT RPM hunting means the ECU is stuck on LIMPHOME mode (CEL GLOWS!), as all do in the mode the idle regulation via IAC is not on LINE. The flash codes most work. sorry but that is a fact. blinked out , DTC ODB1, 2 digit flash codes(DTC), like Morse code is but not the same. no 2 cars made then have the same OBD1 codes, this is JEEP codes only. The CEL glowing is the problem The CEL (Mil/ses) lamp glows if a major sensor is dead, shorted ,open,missing or dead as a door nail. that is all OBD1 does is report things dead. unlike wonderful OBD2. we all know so well. There is no EGR here (unless engine swapped alien) so no EGR stuck open and stalls. (main EGR is not there 1995) dead ECT dead 02 or shorted. Dead MAP Dead TPS. CMP failing or CKP failing. (2 sensors cam/crank) 12vdc is really 10v or lower, ECU goes DEAD (offline actually)not dead dead. [B][COLOR=rgb(184, 49, 47)]A142 overload detected.[/COLOR][/B] Try new caps in the ECU or learn the key on 3 times trick first. learn this trick in the manual so is not really a trick but sure does seems like it is , first time seen to most folks. (practice first before car fails.)learn the test. key on 3 times. (even my newer jeeps do it) The ECU wants to tell you why it is failing, (it or the sensors. etc) wires shorted inputs to the ECU too will do it. if it shuts down, the first think I do is see if the ASD relay did that, swap horn and ASD relay to see if HORN relay cures it, most times not. The ASD drops out for all outputs of ASD overloaded, the ECU measure the load, and if to much shuts it down, this is to stop engine fires. ok, by law too DOT. 1 of 4 injectors short out hot. the O2 sensor wires shorted (heater) and ASD drops. the ASD sees (a142 wire) to ALternator is shorted the ASD drops off line, engine stalls fast, all spark and fuel ends at ASD DROP. the book free shows, how A142 wires is connected. all things on the 1 wire must not short.(overload.) as you see I know my ECU's well. even 0bd1, In can talk on this subject all day. here is the a142 page I made to make it more easy. (I use a voltmeter on A142 to see if it drops just before the stall) here is all we need on ASD see why it drops? the drawning is complex as is the functions of ECU. (to prevent fuel fires,crash and burn) [ATTACH type="full" alt="ASD-TESTING.JPG"]122210[/ATTACH] [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
95 2.5 Idles Erratically Then Stalls at Operating Temperature
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