91green Posted June 25, 2018 Author Share Posted June 25, 2018 Link to comment Share on other sites More sharing options...
91green Posted June 25, 2018 Author Share Posted June 25, 2018 Got a nother column Link to comment Share on other sites More sharing options...
91green Posted June 26, 2018 Author Share Posted June 26, 2018 Link to comment Share on other sites More sharing options...
91green Posted July 1, 2018 Author Share Posted July 1, 2018 New column with key and functional ignition switch installed still not shifting the AW4 when the 10A fuse is installed... 20180630_210315.jpg 20180630_210315.jpg Link to comment Share on other sites More sharing options...
HOrnbrod Posted July 1, 2018 Share Posted July 1, 2018 I think you've exhausted all of the possible external causes of your no shift problem. Time for a visit to the transmission shop to check the AW4 hydraulics and other internal diagnostics. Link to comment Share on other sites More sharing options...
91green Posted July 1, 2018 Author Share Posted July 1, 2018 Thanks guys for all the tips. Link to comment Share on other sites More sharing options...
Green Mesa XJ Posted July 2, 2018 Share Posted July 2, 2018 Did you find the problem? I think the new column was a good idea. Sent from my iPhone using Tapatalk Pro Link to comment Share on other sites More sharing options...
Eagle Posted July 2, 2018 Share Posted July 2, 2018 Shifting is controlled by solenoids. If it shifts manually, the transmission isn't the problem. I don't know how to check out the solenoids, but that's where I would look next. Link to comment Share on other sites More sharing options...
91green Posted July 2, 2018 Author Share Posted July 2, 2018 Yeah, I think the solenoids inside the transmission pan are next up... Â Link to comment Share on other sites More sharing options...
Green Mesa XJ Posted July 2, 2018 Share Posted July 2, 2018 Did you confirm the tcu was getting power? Sent from my iPhone using Tapatalk Pro Link to comment Share on other sites More sharing options...
HOrnbrod Posted July 2, 2018 Share Posted July 2, 2018 13 hours ago, Eagle said: Shifting is controlled by solenoids. If it shifts manually, the transmission isn't the problem. I don't know how to check out the solenoids, but that's where I would look next.   Completely forgot about the solenoids. Here's how to check the solenoid coils w/o pulling the tranny pan. It's done at the white 7-pin connector on the AW4 harness in the transmission tunnel. On the below diagram, pin B is tied to the ground side of each solenoid. Use an ohmmeter to check for a solenoid coil resistance of 12-15 ohms across pins G to B (S1), F to B (S2), and E to B (S3). An open circuit (infinite resistance) indicates an open solenoid that must be replaced.   Link to comment Share on other sites More sharing options...
91green Posted July 2, 2018 Author Share Posted July 2, 2018 I havent metered the TCU or the solenoids. Â Thats next, I never metered the TCU or even the TPS yet but now its time lol. Link to comment Share on other sites More sharing options...
Eagle Posted July 2, 2018 Share Posted July 2, 2018 The solenoids are the key. Back in the days of the old XJ Forum (the predecessor of NAXJA) there was a member named (IIRC) Frank Swigert who had an XJ 4.9L engine and AW4 transmission in a Hornet station wagon. He had the tranny wired up to a 6-position rotary switch so he could control shifting manually just by turning the knob. Once he had it in overdrive (4th gear), the next step on the knob locked the torque converter. Â That's why the FSM for the AW4 starts out by having you pull the fuse for the TCU and test drive by shifting manually. If that works, the tranny works, and you look for electrical problems. Link to comment Share on other sites More sharing options...
ParadiseMJ Posted July 3, 2018 Share Posted July 3, 2018 Check the solenoids in the cab, via the TCU to tranny connector. No need to drop the pan, FWIW. If you get a bad reading that is consistently bad, open the bottom and the solenoids are 1 bolt easy to replace...the hardest part being removing the trans pan. You also should check the connectors at the firewall to see that they're plugged in, clean etc.  Take that opportunity to change the filter, gasket and fill with nice fresh Dex III or better. No ATF-4.  IMHO Link to comment Share on other sites More sharing options...
Green Mesa XJ Posted July 3, 2018 Share Posted July 3, 2018 I may be wrong I thought his problem was the tcu was not getting power? Sent from my iPhone using Tapatalk Pro Link to comment Share on other sites More sharing options...
91green Posted July 4, 2018 Author Share Posted July 4, 2018 Meters good. Â B to E is 13 ohms, F is 15 ohms and G is is 14 ohms. Link to comment Share on other sites More sharing options...
91green Posted July 8, 2018 Author Share Posted July 8, 2018 Dropped the trans pan and pulled each of the three solenoids and checked then to make sure the actuate using a car battery and they all "clicked" the same Link to comment Share on other sites More sharing options...
HOrnbrod Posted July 8, 2018 Share Posted July 8, 2018 28 minutes ago, 91green said: Dropped the trans pan and pulled each of the three solenoids and checked then to make sure the actuate using a car battery and they all "clicked" the same  You could have applied 12V and GND at the connector pins and checked for the solenoid clicks w/o pulling the pan, but at least you've seen them up close and personal now.  Last thing I can think of: Check for 12VDC on the TCU connector pins D14 (RED wire - battery 12V) and D16 (YEL wire - 12V IGN). Link to comment Share on other sites More sharing options...
91green Posted July 8, 2018 Author Share Posted July 8, 2018 I have done both now lol, just thought maybe the metered good but were stuck Link to comment Share on other sites More sharing options...
91green Posted July 8, 2018 Author Share Posted July 8, 2018 Can i meter from the same gray connector back towards my TCU to verify the ohms resistance is good in the TCUs? Link to comment Share on other sites More sharing options...
91green Posted July 8, 2018 Author Share Posted July 8, 2018 Since I have more than one TCU i can check? Link to comment Share on other sites More sharing options...
91green Posted July 8, 2018 Author Share Posted July 8, 2018 Ok red and yellow wires on the back of the TCU connector, I will try that! Link to comment Share on other sites More sharing options...
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