TCU/TCM compatibility question?????
03-18-2019, 08:25 PM
#1
Junior Member
Thread Starter
Join Date: Feb 2019
Location: San diego
Posts: 30
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1989
Model: Cherokee (XJ)
Engine: 4.0
TCU/TCM compatibility question?????
I have a 99 transmission in my 89 xj and was wondering if i could wire in a 99 tcu/tcm to fix my shifting issues due to the output speed sensor pulsating 4x as fast and how much work would be needed to splice or wire in a new one
03-18-2019, 11:27 PM
#2
CF Veteran
Join Date: Dec 2017
Posts: 3,898
Received 1,068 Likes
on
858 Posts
Year: 1989
Model: Comanche (MJ)
Engine: 4.0
Yes, it's possible. I think the 98+ tcu connector might be shaped different. I don't recall what year that changed, might have been 2000. Otherwise, prior to that, the connector was essentially the same aside from the keying ridges (which could be shaved off) and the color (grey for Renix, green for HO, and red for the chrysler trans in the ZJs). So you might need to grab the wiring harness connector with the TCU.
When I did a 98 AW4 into my 89, I remember the wiring colors were almost identical, with the solenoid wires being black with the stripe versus white with the stripe. Off the top of my head the wiring differences would be needing to run the wire for the extra speed sensor on the front of the 99 AW4. I think the NSS is different and has an extra wire as well (not positive). You'll need to wire the TPS to the flat 3-pin connector instead of the square 4-pin connector, as the HO+ setup used the same input as the engine computer, instead of the second, backwards output. The obd2 data lines on the 99 won't matter as the data lines on the 89 just run to the yellow connector under the hood. The 89 engine computer won't throw any codes since it has no connection to the tcu. (yeah, it's late and I'm rambling a bit).
When I did a 98 AW4 into my 89, I remember the wiring colors were almost identical, with the solenoid wires being black with the stripe versus white with the stripe. Off the top of my head the wiring differences would be needing to run the wire for the extra speed sensor on the front of the 99 AW4. I think the NSS is different and has an extra wire as well (not positive). You'll need to wire the TPS to the flat 3-pin connector instead of the square 4-pin connector, as the HO+ setup used the same input as the engine computer, instead of the second, backwards output. The obd2 data lines on the 99 won't matter as the data lines on the 89 just run to the yellow connector under the hood. The 89 engine computer won't throw any codes since it has no connection to the tcu. (yeah, it's late and I'm rambling a bit).
03-19-2019, 01:29 AM
#3
Junior Member
Thread Starter
Join Date: Feb 2019
Location: San diego
Posts: 30
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1989
Model: Cherokee (XJ)
Engine: 4.0
Yes, it's possible. I think the 98+ tcu connector might be shaped different. I don't recall what year that changed, might have been 2000. Otherwise, prior to that, the connector was essentially the same aside from the keying ridges (which could be shaved off) and the color (grey for Renix, green for HO, and red for the chrysler trans in the ZJs). So you might need to grab the wiring harness connector with the TCU.
When I did a 98 AW4 into my 89, I remember the wiring colors were almost identical, with the solenoid wires being black with the stripe versus white with the stripe. Off the top of my head the wiring differences would be needing to run the wire for the extra speed sensor on the front of the 99 AW4. I think the NSS is different and has an extra wire as well (not positive). You'll need to wire the TPS to the flat 3-pin connector instead of the square 4-pin connector, as the HO+ setup used the same input as the engine computer, instead of the second, backwards output. The obd2 data lines on the 99 won't matter as the data lines on the 89 just run to the yellow connector under the hood. The 89 engine computer won't throw any codes since it has no connection to the tcu. (yeah, it's late and I'm rambling a bit).
When I did a 98 AW4 into my 89, I remember the wiring colors were almost identical, with the solenoid wires being black with the stripe versus white with the stripe. Off the top of my head the wiring differences would be needing to run the wire for the extra speed sensor on the front of the 99 AW4. I think the NSS is different and has an extra wire as well (not positive). You'll need to wire the TPS to the flat 3-pin connector instead of the square 4-pin connector, as the HO+ setup used the same input as the engine computer, instead of the second, backwards output. The obd2 data lines on the 99 won't matter as the data lines on the 89 just run to the yellow connector under the hood. The 89 engine computer won't throw any codes since it has no connection to the tcu. (yeah, it's late and I'm rambling a bit).
Thread
Thread Starter
Forum
Replies
Last Post
Mudboi222
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
32
09-29-2020 06:34 PM
inlinepower
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
27
02-14-2019 11:41 AM
mitch500
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
14
05-12-2015 08:51 PM
highvoltagefeathers
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
3
11-03-2012 03:32 PM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)