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  • June 26th, 2019, 11:31 PM
    Escape

    Re: Stuck in 4wd Lo. SFTA but need more info.

    If the autobox goes into limp mode, you probably unplugged that ECU, instead of the one for the transfer case. The autobox ECU is the forward one under the seat, the transfer box ECU the rear one, harder to reach.
    But as that does seem to have solved the blinking lights, syou can say all is well.

    Filip
  • June 26th, 2019, 02:55 PM
    95classiclwb

    Re: Stuck in 4wd Lo. SFTA but need more info.

    what is the condition of your battery? have you had it tested? on p38 an under performing battery will cause trans ecu to log codes, go into limp modes, etc. basically your symptoms.
  • June 26th, 2019, 09:22 AM
    Agent 14

    Re: Stuck in 4wd Lo. SFTA but need more info.

    UPDATE: Unplugged the trans ECU for a few days. It immediately went into limp mode and only had 3rd gear. I noticed it immediately.

    Anyway, dealt with it for a few days then plugged ECU back in. No flashing lights on dash, no warnings, etc. Also might have all 4 gears back. Huh.

    I havent taken it up to highway speeds yet so i havent confirmed 4th...but i will do that today.

    Thanks for all the help, guys.
  • June 15th, 2019, 01:25 PM
    Escape

    Re: Stuck in 4wd Lo. SFTA but need more info.

    First of, you don't need the engine running to shift between low and high. Ignition on is sufficient, makes it a bit more comfortable if you're underneath.

    And yes, you can leave the transfer ECU unplugged if you don't need it. I've had a spare car running like that for many years, after the ECU got fried. As said above, you do need the motor on the transfer box to make sure it can't jump out of high. I've had that happen after an emergency repair (bodge), not fun pulling over to the hard shoulder with no driver and a loaded trailer!

    Filip
  • June 13th, 2019, 12:34 PM
    Agent 14

    Re: Stuck in 4wd Lo. SFTA but need more info.

    Ok, i think we are on to something. Im fairly sure the motor is the issue. I tried switching it from low to high while off the transfer case (its fun being underneath a running car on the ground) and the motor didnt move at all. That why i took it apart, to attempt to fix it. I discovered it WAS misaligned so i realigned it....but not accounting for the blue encoder potentiometer. So im assuming the motor is fairly ruined.

    Now, since ill get a new one at a later date, i like what youre suggesting here.

    Unplug the transfer case ECU under the driver's seat and see what it does? If i dont plan on using Low for a few months, Should i EVER plug it back in before i get a new transfer motor? Im in SoCal so i wont need 4wd Low for a quite a while.
  • June 13th, 2019, 07:18 AM
    Escape

    Re: Stuck in 4wd Lo. SFTA but need more info.

    I'm not convinced the gearbox itself is in limp mode. Sounds like the transfer motor (and/or ECU) is the problem.
    Easy to check the gearbox: get up to some speed and manually shift back to 2nd or first (depending on speed), if the box reacts it's not in limp.
    I'm wondering if unplugging the transfer ECU is enough to default to high range, so the autobox shifts normally again. It takes the range signal only from the transfer ECU (same line as the BECM), not from any other switches.
    One other thing to try is let the motor go to high while it's off the transfer box. But I fear the position switches in the motor gearbox are the cause, so you're unlikely to get a proper signal without opening them up. Rave does list the input for the different positions, so you could fool the transfer ECU with pigtails if need be.

    Filip
  • June 12th, 2019, 04:07 PM
    Richard_G

    Re: Stuck in 4wd Lo. SFTA but need more info.

    Gear shift lights should only flash when you are moving the gear shift across the gate to select low ratio. The N display comes from the XYZ switch but there is another switch (the Neutral switch) under the shift lever to tell the ECU you have moved the shift lever across the gate. It sounds like that is permanently engaged so it thinks you are trying to change range when you are actually engaging a gear. You can confirm this by getting to the 6 way white connector (C615A) under the centre console and trying to select gears with it unplugged. If you lose the Select Neutral warning then the switch is permanently grounded making it think you are moving the lever across the gate. By the sound of it, this is one of two problems, the other being a range change motor that needs replacement.
  • June 12th, 2019, 12:56 PM
    Agent 14

    Re: Stuck in 4wd Lo. SFTA but need more info.

    New symptom!

    When i run through the gear in 4wd High, the dash shows "N" when in neutral...but goes back to "SELECT NEUTRAL" once i put it into ANY other gear. The gear shift lights flash always.

    This tells me the neutral switch is probably fine, and the encoder is off alignment (based off another thread). Any way to get that motor back in alignment enough to pull it out of limp mode? I dont care about 4wd Low for now. I just need to get her back on the road.
  • June 12th, 2019, 12:30 PM
    Agent 14

    Re: Stuck in 4wd Lo. SFTA but need more info.

    Seems the Fuse37 thing is only for the next model. Any tricks for the p38?
  • June 12th, 2019, 10:21 AM
    Agent 14

    Re: Stuck in 4wd Lo. SFTA but need more info.

    Are we talking about the Fuse 37 Calibration method? Im not sure that will work since i dont think the motor is working well. I tried shifting it into 4low and high as suggested. Shifted into 4low no problem. Did not go back into high. Went right to neutral. It does go back into 4 low though.
  • June 12th, 2019, 06:01 AM
    95classiclwb

    Re: Stuck in 4wd Lo. SFTA but need more info.

    since you know what to do, I would suggest shifting again. you have nothing to loose and a lot to gain, it may work normal again.
  • June 12th, 2019, 03:31 AM
    Richard_G

    Re: Stuck in 4wd Lo. SFTA but need more info.

    It has gone into limp mode. If it detects a fault when stationary, it only uses third gear, if detected when moving it only uses fourth but it will still feel like it is changing gear when the torque converter clutch locks up. In limp mode kickdown and the Sport button don't work. However, in limp mode you would normally get a Gearbox Fault message on the dash, not Select Neutral so it does sound like it is the range change motor that needs calibrating.
  • June 12th, 2019, 12:39 AM
    Agent 14

    Re: Stuck in 4wd Lo. SFTA but need more info.

    I DID reconnect everything. I assume the switches are in the BLUE part of the motor? The part where all the wires go into? Man...trying to realign that part is not going to be fun. it just spins freely when removed.
  • June 11th, 2019, 11:05 PM
    Escape

    Re: Stuck in 4wd Lo. SFTA but need more info.

    Good to hear you're up and running again.
    The transmission shifts differently in low or high. So if the controller thinks the car is in low, it will feel off driving in high. Did you put the connector back on the motor? The position switches are in the motor gearbox, the controller is probably remembering the last recorded value so it needs to see the new position to update.

    Filip
  • June 11th, 2019, 09:38 PM
    Agent 14

    Re: Stuck in 4wd Lo. SFTA but need more info.

    Ok, motor removed and i was able to switch it back into 4WD High. The motor wasnt turning so i disassembled it and realigned everything. Im still not going to try it, but i had to adjust the gear to fit into the newly rotated pin.

    This has NOT fixed the "SELECT NEUTRAL" issue though. The dash still flashes (but not beeping). It is driving in 4wd HIGH now but it doesnt seem to be shifting at the same points. Am i just going nuts? Is there anything with that neutral switch that limits the transmission shifts somehow? Like a limp mode?
    Also, since its flashing, i lose the sport mode. Since that changes shift points, i was wondering if these sound related.

    Thanks for all the help guys!

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