What Source Powers The Transfer Case ?

[bobinyelm]

2004 Turbo, 130k miles

 

I have faults saying the transfer case servo motor is not receiving power (nor does it have a ground). (Codes 2040 and 2041)

 

The portion of the Transfer Case/Height Control control box that relates to the drive system (left half) is also not illuminated as is the portion that controls the ride height,. leading me to wonder if the lack of illumination AND lack of control over the T-Case is power related.

 

I cannot find any fuse labeled as if it might feed the transfer case module or servo, but it makes sense that this circuit would be fuse-protected.

 

Anyone know how/from where the T-Case gets its electrical power? The harness is plugged into the motor and shows no physical damage and no corrosion on the pins.

 

I get no "bump" or sensation (or lighted representation of the drive line on the control panel) indicating I am actually engaging 4WD when moving the control, which certainly would fit if the system is unpowered.

 

I also have a low battery (around 11v) w/ the engine not running (it's 13.8-14v w/ the engine running), so will be changing the battery tomorrow in case it's a battery problem.

Edited June 4, 2017 by bobinyelm

[lewisweller]

5 hours ago, bobinyelm said:

2004 Turbo, 130k miles

 

I have faults saying the transfer case servo motor is not receiving power (nor does it have a ground). (Codes 2040 and 2041)

 

The portion of the Transfer Case/Height Control control box that relates to the drive system (left half) is also not illuminated as is the portion that controls the ride height,. leading me to wonder if the lack of illumination AND lack of control over the T-Case is power related.

 

I cannot find any fuse labeled as if it might feed the transfer case module or servo, but it makes sense that this circuit would be fuse-protected.

 

Anyone know how/from where the T-Case gets its electrical power? The harness is plugged into the motor and shows no physical damage and no corrosion on the pins.

 

I get no "bump" or sensation (or lighted representation of the drive line on the control panel) indicating I am actually engaging 4WD when moving the control, which certainly would fit if the system is unpowered.

 

I also have a low battery (around 11v) w/ the engine not running (it's 13.8-14v w/ the engine running), so will be changing the battery tomorrow in case it's a battery problem.

After you changed the battery and cleared codes and gone for a nice driving cycle, recheck the codes and clear once more. Recheck codes again and then move onto fuses for TC left side fuse support check fuses 22, 23 47. Fuse support right check 7, 40, 57. 

the control module is under the passenger seat as well as the transmission controller module. Some time the get filled with fluid from the transfer case apparently! 

[bobinyelm]

Thanks-

 

Hopefully tomorrow evening I'll have some positive news.