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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
#29
h2sammo (User)
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Re:Crank but NO start on 93 Jeep Cherokee 6 cyl, 4 2 Years ago Karma: 0  
the yellow wire to ground have 5.0 volts with key ON.

orange wire to yellow wire have 5.0V with key ON.

orange wire to ground has 0 volts.

i just realized i didint check the fuel injectors voltage. Also, i cant find the TP sensor (throttle position?)
 
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#30
Junius (Admin)
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Re:Crank but NO start on 93 Jeep Cherokee 6 cyl, 4 2 Years ago Karma: 5  
Let me know if you have power to the injectors - check while somebody turns the key on and briefly spins the engine.
 
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#31
h2sammo (User)
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Re:Crank but NO start on 93 Jeep Cherokee 6 cyl, 4 2 Years ago Karma: 0  
these injector plugs are very hard to takeout. as a matter of fact i couldbt figure out how to take one out w/out breaking it partially, but i did.

the one i was able to take out and check did not give me any voltage whatsoever with key on (i should read battery voltage, right? 12V). and of course, as i was cranking the car, i didnt see anything.

so imnot getting the injectors pump any gas in my cylinders i dont think.

how can i troubleshoot further?

thank you
 
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#34
Junius (Admin)
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Re:Crank but NO start on 93 Jeep Cherokee 6 cyl, 4 2 Years ago Karma: 5  
That's why it won't start. Find the blown fuse or bad ASD relay - that'll get it going. Outside chance you might have a wiring problem, ground or something, but the PCM turns that ASD relay on, which supplies the injectors and the alternator field with power.
 
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#35
h2sammo (User)
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Re:Crank but NO start on 93 Jeep Cherokee 6 cyl, 4 2 Years ago Karma: 0  
i troubleshot the ASD relay with a multimeter according to instructions here: http://www.ehow.com/how_4421888_test-four-terminal-relay.html

i made it click, when powered, it has continuity when supposed to and doesnt have it when its not supposed to.

ASD relay is fine.

does it have a fuse for the fuel injectors as well? i couldnt find it. unless i get more troubleshooting advice i will go to a junk yard (if i can get a ride) and swap the PCM.
 
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#36
Junius (Admin)
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Re:Crank but NO start on 93 Jeep Cherokee 6 cyl, 4 2 Years ago Karma: 5  
Now you need to know if the ASD relay has power available to it. If the injectors aren't powered up and you don't have 9 volts at the cam and crank sensors, well, that's significant. Check the cavities where the relay plugs it and see if you have power at any of them.
 
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Last Edit: 2008/08/30 03:24 By Junius.
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