Try changing the PCM, there is a chance that some solder connections inside are failing. Also, make sure that the connectors are fully seated. Personally, I have had problems with Bosch sensors on my 97.
SOURCE: coolant censor bad
Yes, there is another one. The one you replaced is the coolant level sensor. The ECT (ENGINE COOLANT TEMP) sensor is located near the thermostat housing. It has a 2 pin plug on it.
SOURCE: help
HAD SAME KIND OF PROBLEM, TO TO DEALERSHIP AND THEY SAID THE BRAIN WENT OUT (COMPUTER) AND THEY REPLACED IT UNDER ALL TERAIN WARRENTY
SOURCE: 1998 jeep cherokee no start seems that pcm is not
I had a similar problem with my 98 Cherokee and after a month in the shop, it turned out to be a short in the wiring harness.
SOURCE: 1999 Jeep Grand Cherokee stalls immediately after
check intake manifold air temp sensor and engine coolant sensor...one may be out of range but not enough to turn on dash light. tests and specs can be found in chiltons or haynes, test is done with digital multi-meter.
SOURCE: p0154 code 02 censor circuit?/ bank 2 censor
codepo154 is o2 sensor on intake manifold passenger side codes ,po304 is either bad sparkplug,wire or coil maybe injector hard to tell start cheap,i beleive its a sensor on tranny itself good luck
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