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Re:Crank but NO start on 93 Jeep Cherokee 6 cyl, 4 (1 viewing) (1) Guest
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TOPIC: Re:Crank but NO start on 93 Jeep Cherokee 6 cyl, 4
#37
h2sammo (User)
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Re:Crank but NO start on 93 Jeep Cherokee 6 cyl, 4 2 Years ago Karma: 0  
i have 5 volts in the cavities where the power terminals go into, with the ingnition in the ON position.
 
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#38
h2sammo (User)
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Re:Crank but NO start on 93 Jeep Cherokee 6 cyl, 4 2 Years ago Karma: 0  
swapped PCM for a used one, same serial number, etc from junk yard, same things, still no voltage on fuel injectors.

how do i troubleshoot this firther?
 
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#41
Junius (Admin)
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Re:Crank but NO start on 93 Jeep Cherokee 6 cyl, 4 2 Years ago Karma: 5  
you should have battery voltage there... find out why you don't
 
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#43
h2sammo (User)
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Re:Crank but NO start on 93 Jeep Cherokee 6 cyl, 4 2 Years ago Karma: 0  
ok, i figured out how to check voltage here.

i put one voltmeter lead on the battery ground, the other on one of the connectors going into the fuel injector. It reads 7.32V (not 12V...why?)

also, the connector going into the camshaft positioning sensor shows 5V between battery ground and one of its female leads.

so both of these parts seem to be getting voltages, but still no spark.
 
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#44
Junius (Admin)
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Re:Crank but NO start on 93 Jeep Cherokee 6 cyl, 4.0L 2 Years ago Karma: 5  
Sounds like the battery is weak... are you reading 12 volts at the battery? Both voltages you're reporting are slightly low. Low battery voltage willl cause that AND a lack of spark.
 
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#45
h2sammo (User)
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Re:Crank but NO start on 93 Jeep Cherokee 6 cyl, 4 2 Years ago Karma: 0  
battery reads 12.5V. It is new, had it for 1 month maybe.
 
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