Jump to content

Aw4 not shifting


Recommended Posts

  1. First check fluid level. Then do as suggested, unplug the TCU. Not sure what year you have. Then shift manually as suggested. If it shifts OK manually, with the TCU unplugged, then its electronic. If reverse works, then its probably electronic. Then I'd check the solenoids, three of them. I don't have the pin or plug call outs. But should be able to check them from the TCU plug. Also, check the speed sensors if you can. The Solenoids should be 13 ohms +/- 3 ohms.

Link to comment
Share on other sites

The TCU pinouts changed slightly throughout the years. Since you didn't mention what year your rig is, which wiring harness you are using, or what the "running driving shifting truck" is who knows what you have?

 

You need all this information, then you will need to match your harness connector to the TCU pin-by-pin for it to play correctly. 

Link to comment
Share on other sites

If the fluid level is correct then I'd unplug the TCU and drive it in manual mode. If the trans shifts manually, then its electronics. I usually measure the Ohms for the solenoids at the plug up by the trans fill tube. They should be 13 ohms +/-3 ohms. If you need help, I might be in Indy on Saturday evening.

Link to comment
Share on other sites

Update unplugged tcu and if I manually shift it shifts

OK, then its an electrical problem. I have only dealt with a '98. So a lot different wiring  if yours is a Renix era. I think the HO (90-95) is a bit different. Cruiser's tips are the main source for Renix info. If you can find were to measure the ohms to the solenoids, then measure them. Usually the middle one goes bad. Mine was, and the Transgo instructions stated it usually is. On mine one of the speed sensors was bad. The early ones might only have one speed sensor. The TPS, ECM and brake light switch also have input to the trans. Also, make sure your battery is in good condition.

If it is a solenoid, you have two PnPs in Indy. Its been a month or two since I've been to them. There were two '00 or '01 XJs at the one on Producers lane. I did pick the solenoids and speed sensors from the trans laying out. The latter, greenish blue solenoids are suppose to be better than the brownish tan ones. I do have some brownish tan ones as spares. I'd have to see if I have some of the latter ones I can spare. They guy who bought my other XJ didn't pick up a trans I have.

Link to comment
Share on other sites

Did you try the manual shifting test by disconnecting the TCU and shifting through the gears with the shifter?

Ok yes with the tcu unplugged it shifted when I changed gear with gearshift

Now what??

Link to comment
Share on other sites

 

Did you try the manual shifting test by disconnecting the TCU and shifting through the gears with the shifter?

Ok yes with the tcu unplugged it shifted when I changed gear with gearshift

Now what??

 

The TCU pinouts changed slightly throughout the years. Since you didn't mention what year your rig is, which wiring harness you are using, or what the "running driving shifting truck" is who knows what you have?

 

You need all this information, then you will need to match your harness connector to the TCU pin-by-pin for it to play correctly.

Link to comment
Share on other sites

 

 

Did you try the manual shifting test by disconnecting the TCU and shifting through the gears with the shifter?

Ok yes with the tcu unplugged it shifted when I changed gear with gearshift

Now what??

The TCU pinouts changed slightly throughout the years. Since you didn't mention what year your rig is, which wiring harness you are using, or what the "running driving shifting truck" is who knows what you have?

 

You need all this information, then you will need to match your harness connector to the TCU pin-by-pin for it to play correctly.

Both 87 both 4.0L with aw4's
Link to comment
Share on other sites

So you had a bum replacement tPS?

No I had a bum TPS connector, removed, cleaned with contact cleaner plugged back in reinstalled my old TPS, and TCU shifts fine, going to try and adjust later in the week, shift points are way off, again thanks a ton
Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share

×
×
  • Create New...