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Old December 2nd, 2011, 09:49 PM   #1
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Default 1999 jeep cherokee, ALH swap

I am currently in the process of swapping a ALH motor from a 2000 jetta into a 1999 jeep cherokee.

I have the motor installed into the Cherokee, adapter plates made up, motor mounts fabricated, everything mechanical is pretty much wrapped up. (Will post pictures in the next few days)

The ALH motor was a good runner before I pulled it out of the mk4, and I have researched through all the swaps I can find, in addition to spending hours reading through the bentley manual.
Kerma TDI did a immobolizer, socket, and chip for me, so essentially from my understanding, I only have a few wires to hook up in the ecm to the jeep.

This is what i have so far.

12v constant supplied to pins T121/1&2
Ground supplied to pins T121/4&5
Keyed Power from jeep supplied to T121/37
Keyed Power from jeep supplied to T121/88
I have keyed power supplied to T10f/5 (N146 quantity adjuster)
I have keyed power supplied to T10f/10 (N108 cold-start injector)
I have T10h Connector unmolested running to the gas pedal
I Have G28 & G80 unmolested running straight from the sensors to the ecm
I have the G62 unmolested running from the ect to the ecm
I have map unmolested running from sensor to ecm
I have both G70 and N75 running from sensor to ecm, in addition keyed power being supplied to T5/2

I have primed the IP via vacuum on the return line, I have cracked and bled the injector lines and can see pulsing from them.

The motor will not start.
It will crank all day long, but not catch.
I recently ordered rosstech vcds, so i should be able to pull codes in a few days, but i believe the problem lies in the quantity adjuster, I have 12v being supplied to both sides of the t10f connector for it. As in both from the jeep and from the ecu.

Currently I have the motor trying to run from a can, I've yet to address the difference in fuel pressure off the gasser tank vs. the 3lbs needed for the ALH
The timing should be the same as when i pulled the motor out, I have yet to change the belt.

What is the voltage supposed to be coming from the ecm T121/116&121?

And any help anyone could offer would be of great value, I'm at my wits end trying to sort the electrical out on this motor, It all looks relatively simple but yet, does not work.


I have this posted on tdiclub as well, just looking for other info.
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