Help! no power to fuel pump or coil!!! - Page 2 - JeepForum.com

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post #16 of 28 Old 07-12-2013, 09:07 AM
Siva283
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Quote:
Originally Posted by laybackman View Post
The fuses are the first thing to check no matter what and I mean pull them and test them not just eyeball therm. Next the horn relay can get pulled and be used to test the ASD relay.
The crank, cam & VSS are on the same 8 volt circuit. If a dead short occurs in this circuit there will be no fuse popping, but none of these sensor can send a signal back to the ECM. The VSS is the usual culprit. It could be bad wiring anywhere in that circuit also or the other two sensor are junk, who knows.....

Some time back I was helping a fellow JF member locally (Rat). Oue89YJ was helping also (Thank the JF Gods) suggested unplugging the VSS sensor after we had swapped out or tested everything under RAT's hood. The damn thing fired right up! The only issue was Rat had no speedometer because his '95 YJ speedo was driven by the VSS sensor.
Bottom line is until the OP makes has a game plan to eliminate possibilities he will chase his tail until he flies up his own butt and disappears!

CEL check first, then fuses, then relays, then sensors and wiring.
And they have redundancy built into these systems. Or in plain English if Chrysler to keep the ECM small they melded up a bunch of similar sensors doing the same job! At Chrysler they must hire ex- Gov't bureaucrats as electrical engineers whose thinking is; The straightest distance between two point is a straight line...going the other way!
This makes sense to me now. Thanks man!!!

Op looks like you have your homework assignment.


1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

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Originally Posted by Magnum View Post
I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim
Quote:
Originally Posted by ldso View Post
. It started with a $200 axle, and a few thousand dollars later I was done :)
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Originally Posted by Luuca View Post
diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

Ask me how I know...
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Originally Posted by Overhead View Post
this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.
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post #17 of 28 Old 07-12-2013, 10:30 PM Thread Starter
beefers92
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First off thanks for all of the suggestions! I have tested all fuses via continuity tester. Tested the relays via horn relay slot. If I leave the key on nothing changes. There are no stored codes. I replaced the crank sensor with no luck. I am replacing ecu Sunday.... When I jump the fuel pump relay and the asd relay pump comes on and sounds like it has low power. Still no start. I will test voltage at the relays on Sunday as well. Again I appreciate all the help thus far, you guys are awesome. There will be an update Sunday night!
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post #18 of 28 Old 07-12-2013, 10:34 PM Thread Starter
beefers92
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P. S. I do not have the fuel pump ground inside the Jeep next to the door strap. Mine is on the block where the oil dipstick brace is. It also seems to be good...
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post #19 of 28 Old 07-14-2013, 09:27 AM Thread Starter
beefers92
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So did some more testing this morning and it looks like I have low voltage on the 8 voltage circuit. I'm getting 2.5 volts at the vss white/orange wire. Do the relays need a certain voltage to switch on? If this is an issue where do I go from here?

Y'all have been a great help so far keep it up!
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post #20 of 28 Old 07-14-2013, 09:32 AM Thread Starter
beefers92
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Also have 12 volts at the k19 you speak of isn't that supposed to be a ground?
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post #21 of 28 Old 07-14-2013, 10:23 AM Thread Starter
beefers92
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Ok so I fixed it. Turns out I am freaking stupid! Pulled all the mega fuses to test again and found the 30 amp fuse in the f1 slot was blown. Replaced fuse pump primed and it fired right up. Thanks again for all the input I'm sure it will help in the future.
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post #22 of 28 Old 07-14-2013, 03:18 PM
DirtKar
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All of that back and forth diagnosis and the end result was a blown fuse. Somebody owes Siva and Laybackman some cool refreshing adult beverages. Nice job anyway guys!

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post #23 of 28 Old 07-14-2013, 04:27 PM
Siva283
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Originally Posted by DirtKar View Post
All of that back and forth diagnosis and the end result was a blown fuse. Somebody owes Siva and Laybackman some cool refreshing adult beverages. Nice job anyway guys!
We are just happy to help

Sent from my SPH-L300 using JeepForum

1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

Quote:
Originally Posted by Magnum View Post
I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim
Quote:
Originally Posted by ldso View Post
. It started with a $200 axle, and a few thousand dollars later I was done :)
Quote:
Originally Posted by Luuca View Post
diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

Ask me how I know...
Quote:
Originally Posted by Overhead View Post
this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.
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post #24 of 28 Old 07-14-2013, 04:38 PM
laybackman
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Quote:
Originally Posted by Siva283 View Post
We are just happy to help

Sent from my SPH-L300 using JeepForum
That's the truth!

Keep in mind that you not only solved a problem but you learned more about your YJ than you knew before.

Do you know what was good about the good old days? I wasn't good, And I wasn't old!

Senators and Congressman should wear uniforms like NASCAR drivers so we could identify their corporate sponsors....
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post #25 of 28 Old 07-14-2013, 04:44 PM
Siva283
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Quote:
Originally Posted by laybackman View Post

That's the truth!

Keep in mind that you not only solved a problem but you learned more about your YJ than you knew before.
This is true I know I learned something new

Sent from my SPH-L300 using JeepForum

1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

Quote:
Originally Posted by Magnum View Post
I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim
Quote:
Originally Posted by ldso View Post
. It started with a $200 axle, and a few thousand dollars later I was done :)
Quote:
Originally Posted by Luuca View Post
diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

Ask me how I know...
Quote:
Originally Posted by Overhead View Post
this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.
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post #26 of 28 Old 07-14-2013, 05:07 PM
laybackman
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Quote:
Originally Posted by beefers92 View Post
P. S. I do not have the fuel pump ground inside the Jeep next to the door strap. Mine is on the block where the oil dipstick brace is. It also seems to be good...
You're right! I think they moved it in '91 when all engines went with FI.

Do you know what was good about the good old days? I wasn't good, And I wasn't old!

Senators and Congressman should wear uniforms like NASCAR drivers so we could identify their corporate sponsors....
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post #27 of 28 Old 07-15-2013, 05:35 AM
Siva283
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Quote:
Originally Posted by laybackman View Post

You're right! I think they moved it in '91 when all engines went with FI.
My 95 has things grounded at both spots.

Sent from my SPH-L300 using JeepForum

1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

Quote:
Originally Posted by Magnum View Post
I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim
Quote:
Originally Posted by ldso View Post
. It started with a $200 axle, and a few thousand dollars later I was done :)
Quote:
Originally Posted by Luuca View Post
diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

Ask me how I know...
Quote:
Originally Posted by Overhead View Post
this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.
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post #28 of 28 Old 07-15-2013, 06:02 AM Thread Starter
beefers92
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Join Date: Jan 2009
Location: Ada, OK
Posts: 31
Ya after some research I learned that it's only on 94 and 95 yjs, or the one that were taken in for factory recall.
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