1995 YJ/XJ factory servie manual HELP

[043500]

I need you to look something up for me. My 1994 service manul includes the XJ and YJ...what I need is for the YJ motor.

I'm running a 1994 YJ 2.5L engine and wiring harness.

We went to crank the motor tonight and we are getting code 54 (I believe) which is CAM position sensor. We finagled some things and got it to run BUT after shutting it down we could not get it to start again.


What we need you to look at are the 2 "engine connectors". They are the 16 pin connectors that go between the PCM and power dist block and I believe the interior harness.

We need you to look at the manual AND the actual connectors to verify all the wires are in the right color/sequence.

In my 1994 manual this is on sheet 69 for the YJ wiring diagrams...the 4.0L and 2.5L are listed together BUT it;s easy to distinguish. So if you could just run down the list for both connectors and tell us what the color codes are for each of the 16 pins it would be much appreciated...AND if you could verify that they are the same under the hood. Again this is for the 2.5L engine.


We think we ended up with a 1995 power dist block and there are about 3 wires that don't match up between it and the 1994 harness...so if we can trace them we can re-wire them correctly.

THANKS!

 

[fizassist]

Not having much luck finding it in the '95 FSM. What's it called in the '94? What section is it in?

 

[Matthew Currie]

I'll look in the 95 FSM later when I have time (just going out the door). IN the meantime, though, try this: With ignition on, unplug the distributor. If the vehicle then makes "booting-up" sounds and starts one time, but fails to restart, it's not the harness. It's the cam position sensor itself.

 

[043500]

Thanks Matthew. We did do this and it did pop the cam sensor...fortunately we had 2 used ones and I just today got a new one but we want to find out why it;s causing them to go so we don't blow any more. We ended up jumping one of the wires and it worked but that's when it blew the 2nd sensor.


On the 1994 harness there's an orange wire that we know is the culprit. It comes out of (or into) the PCM from the CAM, CRANK, O2, and a couple other 'ignition' important things.

Problem is that in the FSM it should be a continuous wire through each of the 2 big 16 pin connectors. BUT when it hits the one connector for the power dist block it turns green...the 2 orange wires don't meet up. We jumped the 2 orange wires and it completed the circuit...so this is why we need to know the colors of the wires on the 1995 wiring diagrams for the 2 16 pin connectors. This way we can determine what does what and splice them accordingly.

 

[Matthew Currie]

Ok. I have here the connector pinouts for C-105 which should be the connector to the rear of engine, showing two versions of the connector, though both are numbered the same. I can't quite figure whether there are two versions, or whether they're showing both sides. One connector diagram shows a square connector, with cavities reading from top left, alternating right-left, to bottom left. In other words, if you were reading the rows like printed lines, they would read: 1234 /8765/9 10 11 12/ 16 15 14 13. The other diagram shows a similar plug with a clip or ear on the top, which is the mirror image of the first.

Numbers are as follows, with cavity number, followed by circuit number, followed by color:

1=T40, brown
2=C3 dark blue/black
3=A141 dark green/black
4=G4, dark blue
5=L1, violet
6=C20 borwn/red
7=C21, dark blue /yellow for 4.0; G7 white/dark red for 2.5
8=A142 dark green dark red
9=G5, dark blue/white
10= T41, brown/yellow
11=B4, light green for 4.0; K7, dark red for 2.5
12=B3, light green/ dark blue - twisted pair with B4
13=T22 dark blue /tan
14=G60, gray/yellow
15=B2, yellow
16=B1, yellow/dark blue twisted pair with B2

Connector C-107, located at center of cowl near map sensor, looks just the same, with same numbering pattern.

Its connectors are:

1, C20 brown-red
2, c91 light blue
3, a14 red/white
4, c13, dark blue/ dark red
5,t41, brown/yellow
6,g20,violet/yellow
7,g50,white/yellow
8,g3.black/pink
9,v40,white/pink
10,k51,dark blue/yellow
11,k54,orange/black
12,g21,gray/light blue
13,d20,light green
14, d21,pink, twisted pair with d20
15, g7,white/orange
16 blank on 4.0, k7 orange on 2.5

In the wiring diagram, the cam position sensor has three wires. Terminal 3, circuit K7, orange, connects through a splice to an orange wire that goes to terminal 3 on the vehicle speed sensor. It also goes, still orange, through C107, via a splice, to both terminal 3 of the Crank position sensor, and to terminal 7 of the PCM, which is labeled 8 volt supply.

Terminal 2, circuit K4, black/light blue, goes to a splice, and thence through several other splices, to PCM terminal 4, sensor ground, as well as to terminal 2 of the vehicle speed sensor. One of those splices also sends the same signal to terminal 2 of the CPS. All these lines are black/light blue.

Terminal 1, Tan/eyllow, circuit K44, goes straight to PCM terminal 44, "CMP sensor signal."

I hope that all helps. If there are still questions, PM me, and we can arrange further info. I can copy or scan some of the pages of my FSM, which owing to a freak accident last year is already unbound. It was sitting on my table saw in my shop when a drunk driver missed the corner and careened through the front of the building. The poor FSM was flung across the room and landed in pieces. But the good side of it is that this makes it quite easy to copy individual pages. Depending on bandwidth and time requirements, I could either email you some pages or print and snail mail them.

 

[043500]

This helps a lot Matthew.

I went through the '94 FSM for about 2 hours yesterday copying down every wire on every sheet to see where they all went in relation to the 2 16 pin connectors. I'll compare your notes to the 1994 FSM BUT we think what the issue is that we ended up with a 4.0L power dist block.

Again this is most helpful

 

[043500]

Figured it out.

We still don't know what year or even what motor the power dist block is from. It doesn't match the 4.0L or 2.5L for either year ('94 or '95) exactly so we were stumped.

What the problem was the CAM position sensor was not getting juice nor was it grounded. We solved the power problem but it took us 2 hours tonight to figure out the ground. Turned out to be ONE stinking wire!

But she's running now and sounds good.

 

[Matthew Currie]

Figured it out.

We still don't know what year or even what motor the power dist block is from. It doesn't match the 4.0L or 2.5L for either year ('94 or '95) exactly so we were stumped.

What the problem was the CAM position sensor was not getting juice nor was it grounded. We solved the power problem but it took us 2 hours tonight to figure out the ground. Turned out to be ONE stinking wire!

But she's running now and sounds good.

Glad to hear it.