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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: 440932" data-attributes="member: 21229"><p>F1 is also called (modern name) Ignition off drain IOD.</p><p>we pull the fuse and the PCM resets.forgets all DCTs stored.</p><p>F1 is hot all the time.</p><p>the PCM memory (OID) is hot all the time. unless F1 blows. (or car battery pulled or battery cells dead open)</p><p></p><p>A code 12 may mean the fuse is blown or battery is over loaded (weak)</p><p>CODE 12 each time keyed on (called live code errors)</p><p>if the battery goes weak driving is can store CODe 12 in memory but if f1 is blown only live codes are resented</p><p>this is a key point to understand on all cars MPI oBD1 or OBD2.</p><p></p><p>but on this <strong>unique car</strong> F1 blown kills spark and fuel both.</p><p>and kills dead the DTC memory pin, a triple kill in 95s/</p><p>so code 12s are a bad fuse or weak battery</p><p>1 or the other.</p><p>page 8w-11-6 ,to pcm pin 3. memory pin</p><p></p><p>this error is common as folks never keep a dead car charged and code 12, weak battery pops</p><p>the FSM tells you in first EFI chapter, to keep the battery fully charged or tests will fail hard. ( chaos)</p><p><strong></strong></p><p><strong>so got spark for 4 to 10 seconds??</strong></p></blockquote><p></p>
[QUOTE="deadpool1, post: 440932, member: 21229"] F1 is also called (modern name) Ignition off drain IOD. we pull the fuse and the PCM resets.forgets all DCTs stored. F1 is hot all the time. the PCM memory (OID) is hot all the time. unless F1 blows. (or car battery pulled or battery cells dead open) A code 12 may mean the fuse is blown or battery is over loaded (weak) CODE 12 each time keyed on (called live code errors) if the battery goes weak driving is can store CODe 12 in memory but if f1 is blown only live codes are resented this is a key point to understand on all cars MPI oBD1 or OBD2. but on this [B]unique car[/B] F1 blown kills spark and fuel both. and kills dead the DTC memory pin, a triple kill in 95s/ so code 12s are a bad fuse or weak battery 1 or the other. page 8w-11-6 ,to pcm pin 3. memory pin this error is common as folks never keep a dead car charged and code 12, weak battery pops the FSM tells you in first EFI chapter, to keep the battery fully charged or tests will fail hard. ( chaos) [B] so got spark for 4 to 10 seconds??[/B] [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
95 YJ crank, no start
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