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Old 10-24-2012, 06:55 AM   #1 (permalink)
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Default 4 wheel low

hi all my first post so please bear with me .terrican diesel 2.9 06 plate.
will not go into 4 wheel low.Indicator lights come on on first start up for 4 wheel high@low. Will go into 4wheel high but will not go into 4wheel low.If anyone could shed any light on my problem it would be much appricated.
cheers smiggy
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Old 10-24-2012, 12:42 PM   #2 (permalink)
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If you say you cannot engage 4L setting, I presume your car has EST type transfer case (Electronic Shift Transfer) and not ATT (Active Torque Transfer).

In case of the EST transfer, there are some items that may be failing to work so that 4L is not engaged. Such items may be:

1) Shift motor (inside transfer case)
2) Speed sensor (does not signal vehicle stop)
3) Hub solenoid
4) Selector switch
5) Motor position sensor

From the above, my first suspicion would be around the selector switch, but not the switch itself but specifically the connection to the transfer case. It may be rusted or broken.

Sometimes, if there is really something bad, the system will signal an operation error by blinking the 4WD light in instrument panel. If this is your case, then an OBDII scanner can retrieve an error code signaling exactly what is wrong.

If this light is not blinking, then it is most likely a bad connection problem, usually at the transfer case.
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Old 10-24-2012, 12:46 PM   #3 (permalink)
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I think that you should check the selector switch. I try it once...
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Old 10-24-2012, 04:29 PM   #4 (permalink)
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thanks 4 the replies will investigate and let u know if i find anything
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Old 10-24-2012, 08:16 PM   #5 (permalink)
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smigie.
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Old 11-03-2012, 12:01 PM   #6 (permalink)
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My Starex had the same problem and it was the speed sensor that was the problem. Replaced the sensor and that solved the problem.
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Old 11-03-2012, 06:55 PM   #7 (permalink)
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Default Interesting discovery about the 4L setting

Just today, driving back home and thinking about this thread, I decided to engage 4H and 4L randomly (on regular pavement, mid city), just to check its operation and full engagement and disengagement of both settings.

I have to say, that in the past year, I've used 4H several times, but never 4L setting... so this is what happened today.

Upon switching to 4H (from 2H), the transfer case engaged almost immediately, but when standing still and when moving along. It disengaged as fast, also under both situations (still and moving).

But when trying to engage 4L from 4H, it first refused to do so. Had to move vehicle few feet forward until in abruptly engaged with a hard knock in the transfer case. Also, when switching back to 4H, it remained in 4L for a very long time (more than 30 seconds.)

I repeated the whole operation engaging and disengaging from 4H to 4L several times. By the time I got home and after half a dozen "cycles" between 4H and 4L settings, the 4L engaged and disengaged smoothly in a couple of seconds.

I believe this tests confirms my theory and recommendation that even if you do not use or need the 4 Low or 4 High setting, it is a good practice to engage it every once in a while (once a month or so), just to keep things (actuator motors, fork levers and solenoids) moving and well lubricated, for those very rare occasions you may really need the 4H or 4L setting.
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Old 11-04-2012, 12:46 AM   #8 (permalink)
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just a note: for switching into 4WL the car needs to be in neutral - or clutch pressed if it is has a clutch - and stationay ! ... (the manual cleary says: ..." stop the vehicle ..." ...)

not sure whether it is possible to switch into 4L when the car is rolling, but due to the leverage of the low range the impact of a sudden engagement can be destructive ...

another note: the dash lights only confirm the engagement of the transfer case (which can be heard anyway), but not the engagement of the CADS! ... the engagement of the CADS needs turning front wheels respectively line up of the axles splines ... consequently switching into 4WD when already bogged with the front wheels not turning anymore will likely not allow to engage the CADS ... there are some Terracan owners out there who wondered that while in 4WD (only signalized by the dashlights) they couldn't drive out of a bog hole ...because they switched too late into 4WD the rear wheels were only spinning, but not the front wheels preventing a syncronizing of the splines... to overcome this flaw I added an aftermarket reed contact and a LED to check the engagement of the CADS and now I can see that it can take quite some meters and time till the CADS is fully engaged...

Last edited by Willem Winch; 11-04-2012 at 12:50 AM. Reason: spelling...
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Old 11-04-2012, 10:36 AM   #9 (permalink)
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Quote:
Originally Posted by Willem Winch View Post
just a note: for switching into 4WL the car needs to be in neutral - or clutch pressed if it is has a clutch - and stationay ! ... (the manual cleary says: ..." stop the vehicle ..." ...)

not sure whether it is possible to switch into 4L when the car is rolling, but due to the leverage of the low range the impact of a sudden engagement can be destructive ...

another note: the dash lights only confirm the engagement of the transfer case (which can be heard anyway), but not the engagement of the CADS! ... the engagement of the CADS needs turning front wheels respectively line up of the axles splines ... consequently switching into 4WD when already bogged with the front wheels not turning anymore will likely not allow to engage the CADS ... there are some Terracan owners out there who wondered that while in 4WD (only signalized by the dashlights) they couldn't drive out of a bog hole ...because they switched too late into 4WD the rear wheels were only spinning, but not the front wheels preventing a syncronizing of the splines... to overcome this flaw I added an aftermarket reed contact and a LED to check the engagement of the CADS and now I can see that it can take quite some meters and time till the CADS is fully engaged...
You are right about the 4wlow engagement (full stop, tranny in neutral), but in my experiment, it didn't happened the first times. It did when the vehicle just started rolling or just coming to a full stop. It all came back to normal after several cycles.

Thanks for the info about the CADS system. You are right, sometimes the transfer case has engaged 4H or 4L and the front axles have not engaged yet. Same thing happens when returning to 2H; it takes a couple of wheel turns for the CADS to disengage or engage.
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Old 11-04-2012, 03:02 PM   #10 (permalink)
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wrt the CADS: there is an easy, but very effective remedy to overcome the flaws of the genuine setup: Terracan CADS Control

the modification allows to engage the CADS isolated from the transfer case.... like manual hubs...when I go off road I can engage the CADS without risking wind up of the drive train (the flashing LED indicates that the CADS is really engaged)...then when I really need 4WD I just have to switch the 4WD knob for the transfer case ... no waiting anymore and I could even engage 4WD when already bogged ...
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