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[SOLVED] S81p awd problem.

Discussion in 'Daihatsu Hi jet' started by 85hijettison, Mar 26, 2022.

  1. 85hijettison

    85hijettison New Member

    Have an s81p climber. Seems to lock the front accel when shifting the diff level from 2 h to 4h or 4l but I cannot get anything from the awd dash indicator. I am also not seeing any of the actuators move.

    Things have checked so far:
    1. Vacuum check valve is black side valve cover to orange side front. Positive pressure into engine negative on vacuum to vsv

    2. Check all atmospheric side of vsv are clean (filters)

    3. Soldered new switches into the diff switch board for both awd button and front axle lock button. Led for axle lock seems to work. No dash indicator for AWD and doesn't seem to engage with button hold or press in 4low

    Most likely culprit or things to check next?
     
  2. 85hijettison

    85hijettison New Member

    Also is the truck supposed to lock the front axle and switch to 4wd when you push the diff lever from 2h to 4h or 4l without holding AWD button?

    Will the dash light for AWD come on even if the actuators are not working or there's not enough vacuum/frozen?

    I am trying to see if it's electrical issue or vacuum/actuator issue.
     
  3. 85hijettison

    85hijettison New Member

    I need help if these two vacuum lines are correct. They were switched before. The valve cover line is now running under manifold. I believe this is supposed to be teed to another third line but I am not sure which. The vacuum black orange line now going to the nipple by the large line.

    I'm getting the light on the dash now but it's messed up the idle badly.

    See attached marked up image. Does the bottom line need to tee to the fuel pump nipple? Or a different line? Is it supposed to be bottom of carb/manifold tee to fuel pump and valve cover?

    Is the top line which is black orange check valve line to AWD and actuators/charcoal filter supposed to be on this nipple?
     

    Attached Files:

    Last edited: Mar 27, 2022
  4. 85hijettison

    85hijettison New Member

    Here is before. I think I need to replace the coupling (middle of picture below lines) pictured in my above post with a tee but I am not sure what the third vacuum line is supposed to be.
     

    Attached Files:

  5. 85hijettison

    85hijettison New Member

    Appears to be solved after I soldered in a new latching switch to the 4wd diff lever and switched the vacuum lines to the pictures I had above. Both actuators move freely when the hub (axle) lock and 4wd buttons are pressed.

    I am guessing the "tee" shown in my diagram connects to the fuel pump but unhooking it just bypasses any issues from the charcoal canister getting clogged.

    Fyi the 4wd dash light is tied to the actuators getting vacuum through the switches and not electrical depression of the switches themselves. If you don't have vacuum running to the switch then you don't get dash light for 4wd

    Another thing to note is on my hijet the actuators and switches are extremely quiet. To check them it was easiest to have one person work the diff and myself watch for them to move. Doing it by yourself could be challenging.
     
    Last edited: Apr 1, 2022

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