Hello all,
First time post for me. I've been a long time lurker with not much to add to the great tech advice here. Now I have a problem I can't fix!
So... the issue:
-1997 Cherokee, AW4.-
About a month ago the CEL came on and with the 3x key flip it shows a code 45. This is some kind of mystical code. But in reading many many lists of what the codes mean, I think it is the overdrive or torque convertor lock-up that is the problem. Probably the latter, because when I'm coasting, it seems to drop out of gear. As soon as I give it gas, rpm goes up to 2-2500 then it finds the right gear and it's all good. BUT, sometimes OD does not work at 100kmh when it should. It also starts in drive, which it shouldn't so the problem is causing the TCU to shut down. Otherwise, shifts fine through the gears, I have reverse lights (not NSS).
After a lot of searching I conclude this is an electrical problem, probably solenoid.
So far I have checked the obvious TPS with an analogue meter. The range is about 1-4V. The signal shows up at the TCU harness as well, so no broken wire there.
After checkin this page: http://www.transonline.com/transdigest/magazines/1997-10/Shift%20Pointers/index.html
I checked what I think are the three solenoid pins at the TCU harness. But the TCU harness is different on a 97. It has 13 horizontal pins. However, there are three pins next to one another that produce about an 8ohm resistance, what it should be... I think.
So I'm stumped from here. I have not put a scanner on it and the shops around here charge an hour just to hook it up, no freebies (in BC).
If anyone could suggest a next step I would really appreciate it. From my research it looks like I should take the pan off the trans and ohm to solenoids. But before I dig into it, I thought I'd check it out with yall.
Thanks!
First time post for me. I've been a long time lurker with not much to add to the great tech advice here. Now I have a problem I can't fix!
So... the issue:
-1997 Cherokee, AW4.-
About a month ago the CEL came on and with the 3x key flip it shows a code 45. This is some kind of mystical code. But in reading many many lists of what the codes mean, I think it is the overdrive or torque convertor lock-up that is the problem. Probably the latter, because when I'm coasting, it seems to drop out of gear. As soon as I give it gas, rpm goes up to 2-2500 then it finds the right gear and it's all good. BUT, sometimes OD does not work at 100kmh when it should. It also starts in drive, which it shouldn't so the problem is causing the TCU to shut down. Otherwise, shifts fine through the gears, I have reverse lights (not NSS).
After a lot of searching I conclude this is an electrical problem, probably solenoid.
So far I have checked the obvious TPS with an analogue meter. The range is about 1-4V. The signal shows up at the TCU harness as well, so no broken wire there.
After checkin this page: http://www.transonline.com/transdigest/magazines/1997-10/Shift%20Pointers/index.html
I checked what I think are the three solenoid pins at the TCU harness. But the TCU harness is different on a 97. It has 13 horizontal pins. However, there are three pins next to one another that produce about an 8ohm resistance, what it should be... I think.
So I'm stumped from here. I have not put a scanner on it and the shops around here charge an hour just to hook it up, no freebies (in BC).
If anyone could suggest a next step I would really appreciate it. From my research it looks like I should take the pan off the trans and ohm to solenoids. But before I dig into it, I thought I'd check it out with yall.
Thanks!