Doing 4.0 Swap Now..... Need Help Now !!! - Page 3 - JeepForum.com
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post #31 of 157 Old 01-15-2010, 06:27 AM
dodger889
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1989 YJ Wrangler 
 
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Location: mi
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If I'm not mistaken it orange.

Edit dark blue is the one that runs the ECM which will power the coil.

You are only using about 3 to 4 wires to power every thing for the engine controls
Starter
ECM
power
and a ground
Now the rest of the wired are for sending unit and sensors.

Now you do have the gray wire at the coil to -
and the dark green/orange to the +??


A 89 yj with a 4.0 aw4 sye out of an 92xj. Now the hard part is done time to get it up in the air just a bit. Working on 8.8 with 3.73 and lsd for the rear. and new D30 hp with 3.73 .
For those who have not figured this out I'm old school but can handle the new too.
Quote:
Originally Posted by bigsquat View Post
im just cheap, and cheap makes you creative.

Last edited by dodger889; 01-15-2010 at 06:40 AM.
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post #32 of 157 Old 01-15-2010, 07:57 AM Thread Starter
cevans87
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yes i have grey to - and green/orange to +
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post #33 of 157 Old 01-15-2010, 08:21 AM Thread Starter
cevans87
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ok so i took off the cover to the ecm... i flash tested a few wires...

blue wire --- pin 9 - - - have power

tach wire --- pin 43 - - - dead

ignition coil wire --- pin 19 - - - dead

is my computer bad ?
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post #34 of 157 Old 01-15-2010, 08:30 AM
dodger889
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Do you have power to pin 3 on the ecm?

A 89 yj with a 4.0 aw4 sye out of an 92xj. Now the hard part is done time to get it up in the air just a bit. Working on 8.8 with 3.73 and lsd for the rear. and new D30 hp with 3.73 .
For those who have not figured this out I'm old school but can handle the new too.
Quote:
Originally Posted by bigsquat View Post
im just cheap, and cheap makes you creative.
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post #35 of 157 Old 01-15-2010, 08:31 AM
dodger889
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Oh you will not see a + voltage on the tach or to the coil. the ECM takes them to ground.

A 89 yj with a 4.0 aw4 sye out of an 92xj. Now the hard part is done time to get it up in the air just a bit. Working on 8.8 with 3.73 and lsd for the rear. and new D30 hp with 3.73 .
For those who have not figured this out I'm old school but can handle the new too.
Quote:
Originally Posted by bigsquat View Post
im just cheap, and cheap makes you creative.
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post #36 of 157 Old 01-15-2010, 08:36 AM
dodger889
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Here is something else take a light from pin 32 ( black/pink wire) to a hot and see if that is working when you first turn on the the key that is your check engine light. This is the one to read codes with.

A 89 yj with a 4.0 aw4 sye out of an 92xj. Now the hard part is done time to get it up in the air just a bit. Working on 8.8 with 3.73 and lsd for the rear. and new D30 hp with 3.73 .
For those who have not figured this out I'm old school but can handle the new too.
Quote:
Originally Posted by bigsquat View Post
im just cheap, and cheap makes you creative.
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post #37 of 157 Old 01-15-2010, 08:47 AM Thread Starter
cevans87
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i have power at pin 3, none at 32
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post #38 of 157 Old 01-15-2010, 09:04 AM
dodger889
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You misunderstood me you will not have a + voltage it will be a ground .
Ok let me see if this will make sense to you The ECM takes a lot of the control functions to ground IE coil and the pin 32 you have to supply a + voltage to the otherside of the coil (+) and if you are using a meter or light for testing pin 32 you need to hook up backward to what would be normal. One wire to pin 32 and to a hot voltage to read it. Yes it sound dumb but that is the way the ecm works on some of the control function.

A 89 yj with a 4.0 aw4 sye out of an 92xj. Now the hard part is done time to get it up in the air just a bit. Working on 8.8 with 3.73 and lsd for the rear. and new D30 hp with 3.73 .
For those who have not figured this out I'm old school but can handle the new too.
Quote:
Originally Posted by bigsquat View Post
im just cheap, and cheap makes you creative.
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post #39 of 157 Old 01-15-2010, 09:19 AM Thread Starter
cevans87
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no i have no ground at 32
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post #40 of 157 Old 01-15-2010, 09:41 AM
jsawduste
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Quote:
Originally Posted by dodger889 View Post
You misunderstood me you will not have a + voltage it will be a ground .
Ok let me see if this will make sense to you The ECM takes a lot of the control functions to ground IE coil and the pin 32 you have to supply a + voltage to the otherside of the coil (+) and if you are using a meter or light for testing pin 32 you need to hook up backward to what would be normal. One wire to pin 32 and to a hot voltage to read it. Yes it sound dumb but that is the way the ecm works on some of the control function.
Correct, the CEL is on a switched 12 volt. Switched in that when the key turns a blue/wht wire sends power to the CEL. The ECM then grounds the circuit and the lights goes off after a few seconds, assuming you have no codes. If you do have a code then the ECM continues to ground the circuit, keeping the CEL lit.

Look for a yellow/black at the ring connector that grounds the engine harness. This is a primary ground for the ECM.
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post #41 of 157 Old 01-15-2010, 10:08 AM Thread Starter
cevans87
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where is the ring connector
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post #42 of 157 Old 01-15-2010, 10:51 AM
jsawduste
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Quote:
Originally Posted by cevans87 View Post
where is the ring connector
On a YJ it connects to the oil dipstick mounting bolt. Has 2 yellow/blacks crimped into one connector. One goes to the ECM and the other goes to the trans harness connector.

On this pin 32. Look for a connection to ground. Not voltage.
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post #43 of 157 Old 01-15-2010, 02:59 PM Thread Starter
cevans87
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ok went to the junkyard again, got a new 95xj harness and 94 xj ecm

starting over because of all the wiring issues with last harness
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post #44 of 157 Old 01-15-2010, 07:28 PM Thread Starter
cevans87
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ok another update...

harness is in, ecm is in... everything is hooked up and might i add looks a lot better than last time...

so i had to get a new headlight switch, got it while i was out at the junkyard

i get home get everything in, and hooked up to the battery and low and behold my headlights worked...

everything would seem good right ? wrong.... i don't have the headlight switch in and every circuit on the headlight harness is hot, so now i have to track down where it's getting feed from... any help would be appreciated
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post #45 of 157 Old 01-15-2010, 11:14 PM Thread Starter
cevans87
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another update....

i tied a positve wire from the xj harness to the dead re 12v source to the ignition... then tied the blue power wire for the computer into the yellow wire at the ignition switch i now i have power to computer, fuse block, starter relay, headlights, tail lights, turn signals, high beam indicator, and running lights... still however no power to the coil... so i'm going to refer back to my big block engine wiring knowledge and run a switched 12v lead to the coil and a ground to the negitive side... if someone see's for any reason I shouldn't do that please let me know.

i am now focused on power to the coil... and tripping the fuel pump relay


can i tie a switched 12v lead to the fuel pump relay, then find the 12v source wire from the relay and run it to my pump ?
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