1989 Eliminator Posted June 3, 2015 Posted June 3, 2015 Recently, I had a coolant line blow out which lead to coolant all over the engie compartment. I replaced the hose and filled back up with coolant. It ran fine for almost a whole day. I jump started someone, parked it for 20 minutes, and when I went to drive it again the truck would not shift into fourth. I can shift into 1st 2second third, and reverse. I checked the 3 solenoid ohm readings and they are 21. What else? Desperate need of help...
1989 Eliminator Posted June 3, 2015 Author Posted June 3, 2015 Okay I take back what I said. On the trans connector side I probed e,f, and g to b which is ground. All connections were open. Then I probed e,f, and g to the engine and got the following.. E 15.2 ohms F 18.e ohms G 15.7 ohms When I probed b on the trans side to engine ground I got nothing. Then I probed b on the tcu side and got .2 ohms.
ParadiseMJ Posted June 3, 2015 Posted June 3, 2015 Sounds like you popped a fuse in the jump. Check the 10A TCU fuse under the dash, passenger side. It's in-line in the wiring harness for the TCU. Check the "TRANS" 7.5A in the fuse panel by your left knee.
1989 Eliminator Posted June 3, 2015 Author Posted June 3, 2015 Both fuses are okay. I just drove it again because I let it cool down and not the TC does not seem to be locking up I think. I have to manually shift from first to drive in order to move. If I leave it in drive it takes awhile for it to get going.
1989 Eliminator Posted June 3, 2015 Author Posted June 3, 2015 TPS voltages are okay. Transmission cable is adjusted properly.
1989 Eliminator Posted June 3, 2015 Author Posted June 3, 2015 No WOT. When I slam the pedal it does not go into WIDE OPEN THROTTLE
HOrnbrod Posted June 3, 2015 Posted June 3, 2015 Okay I take back what I said. On the trans connector side I probed e,f, and g to b which is ground. All connections were open. Then I probed e,f, and g to the engine and got the following.. E 15.2 ohms F 18.e ohms G 15.7 ohms When I probed b on the trans side to engine ground I got nothing. Then I probed b on the tcu side and got .2 ohms. Where are you taking your ohm readings? From the disconnected wiring connector on the firewall from the TCU to the tranny?
1989 Eliminator Posted June 3, 2015 Author Posted June 3, 2015 Yes the white connector. Ive looked at other posts and seen diagrams of where each wire goes.
1989 Eliminator Posted June 3, 2015 Author Posted June 3, 2015 Okay well I tried running it without the white connector pulled in and I can shift manually. With the white connector plugged in, it stays in 2nd gear and won't upshift
HOrnbrod Posted June 3, 2015 Posted June 3, 2015 Yes the white connector. Ive looked at other posts and seen diagrams of where each wire goes. The pinouts may be different. On the tranny side of the connector, check and see which pin is actually ground. See if it is in fact pin B. Pins E, F, and G to ground all read ~15 ohms. But your 89 may not be the same. Do you have the AW4 manual? I can send it to you if you PM an email address.
1989 Eliminator Posted June 3, 2015 Author Posted June 3, 2015 B is ground. I have the FSM manual for the engine and it has some transmission stuff in it too. I also have the electrical manual too. Solenoid 2 reads 18.5. Is that too high?
HOrnbrod Posted June 3, 2015 Posted June 3, 2015 The AW4 manual says 11-15 ohms; replace if reading is above or below the specified range. Mine all read on the high side (~15) within .5 ohm of each other. Looks like if S2 was not closing you would have no 2nd or 3rd gear. You could try applying 12V to pin F while monitoring the contacts with an ohmmeter to see if it's making. Do you have a spare TCU?
1989 Eliminator Posted June 3, 2015 Author Posted June 3, 2015 I have a 1998 xj that I was going to try out later today. Is the too new of a jeep or would that work? And your saying 12V to pin f and watch the ohms of which contacts? Between B and F?
HOrnbrod Posted June 3, 2015 Posted June 3, 2015 I know the 91 TCU pinouts are different than the 90 and below, so I doubt a 98 TCU would work. And yes; when you apply 12V to the solenoid coil (pin F for solenoid #2) the solenoid will close and you will go from an open to continuity on the ohmmeter. You will probably be able to hear it click also. If it's working that is. You can verify it on another solenoid. You can use a 9V battery for testing relays and solenoids.
1989 Eliminator Posted June 3, 2015 Author Posted June 3, 2015 So a nearby junkyard has a 1988 wagoneer. Ill see if that tcu works. Since the tcu connector is disconnected and I'm able to shift manually, is that why I do not have OD or a WOT condition? It seems to skip 2nd as well.
cruiser54 Posted June 3, 2015 Posted June 3, 2015 So a nearby junkyard has a 1988 wagoneer. Ill see if that tcu works. Since the tcu connector is disconnected and I'm able to shift manually, is that why I do not have OD or a WOT condition? It seems to skip 2nd as well. Yes, and yes.
1989 Eliminator Posted June 3, 2015 Author Posted June 3, 2015 Okay. So its either the #2 solenoid or the TCU. Ill check the solenoid first then go get the TCU from the wagoneer.
HOrnbrod Posted June 3, 2015 Posted June 3, 2015 You should have 4th gear (O/D) when performing the manual shifting test in DRIVE w/o the TCU. But try the TCU replacement. Image Not Found Image Not Found
1989 Eliminator Posted June 3, 2015 Author Posted June 3, 2015 Reverse: goes into reverse Park: no movement Neutral: no movement 1-2: first gear only Can then shift to 3rd... 3: 3rd gear Can then shift to D D: shifts into gear but doesnt seem like much of a change. I think because the TC isnt locking up. Can downshift from D to 3 to 1-2
shelbyluvv Posted June 3, 2015 Posted June 3, 2015 Check the brake light switch. It will shut off TCC lock up also.
cruiser54 Posted June 3, 2015 Posted June 3, 2015 Check the brake light switch. It will shut off TCC lock up also. Image Not Found
1989 Eliminator Posted June 3, 2015 Author Posted June 3, 2015 The plunger hits my brake lever and the wire is connected to the TCC switch
shelbyluvv Posted June 3, 2015 Posted June 3, 2015 Maks sure it is working properly and not stuck on or off. Do your brake lights work?
1989 Eliminator Posted June 3, 2015 Author Posted June 3, 2015 Yes brake lights work. Does anyone know where the tcu is on a 1988 jeep wagoneer? Or if it even has one... It has the v6
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