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1998 cherokee no start/no spark

i have a 98 cherokee ,standard trans that won't start-cranks but has no spark- no voltage with a test light at the crank sensor harness,cam sensor harness,coil harness.i checked all grounds that i know of including the ground strap at the back of the head to the firewall-not frayed at all.checked grounds by pcm under hood,appear ok,checked grounds by coil.appear ok also.jeep was starting fine-then i let it sit parked for 2 months-kids got in-left interior light on-battery went dead-put in a different battery-cranks fine but won't start-thought maybe some of gods little creatures got in there and chewed wires-but didn't see anything .i know i can't just try a different pcm from bone yard because it has to be programmed to the vehicle- anyone have any ideas -don't really have the money to take to JEEP DEALER for repairs.......oh and yes i did unplug and plug in crank sensor-didn't help.

Reply to
jtgreek
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A test light really isn't not much good except for testing power to lights or a radio. Buy a volt/ohm meter then compare it against Doug's site:

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My money's on theCrankshaft Position Sensor. God Bless America, Bill O|||||||Omailto: snipped-for-privacy@aol.com
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Reply to
L.W. (Bill) Hughes III

forgot to mention jeep has a 4.0 engine-doesn't have fuel at fuel rail either-

-i did swapped asd relay with known good >A test light really isn't not much good except for testing power to

Reply to
jtgreek via CarKB.com

Reply to
philthy

We were taught in electronics school that using a 12 volt test light on modern 'automotive' computer sensors is the best way to fry the PCM known. It introduces 12 volts and a load to a low volt low load CMOS system and will likely fry things.

I would almost suspect the OP was just out of gas....

Or that the new battery wasn't putting out enough volts to fire up the PCM. The new Chrysler systems used are really bad for that.

Mike

86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail > does the odometer say BUSS if it does you have a bad crank sensor and if the
Reply to
Mike Romain

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