4WD System - Low Range Lamp Flashing/Code P1831
Date: May 5, 2004
Order No.: T-B-28.19/05a
Supersedes: T-B-28.19/05 dated April 26, 2004
Group: 28
Revision: Technical Update
SUBJECT:
Model 163.154/157/174/175, as of Chassis # A346835 Low Range Light Flashes, Code P1831
If you receive customer reports in the above model vehicles of the low Range light flashing rapidly (18 times) after vehicle start with fault code
P1831 (Positioner motor, position sensor or power supply is faulty) in transfer case ECU, do not replace the transfer case motor. This is caused by
temporary loss of communication between transfer case control module and shift motor position sensor. To resolve, read out fault codes and cycle
transfer case shift motor by following the below procedure.
1) Read out and erase fault codes.
2) If fault codes other than P1831 are present, diagnose and repair accordingly (use appropriate damage code, operation code and time).
3) If fault code P1831 is present, start vehicle.
2000 Mercedes Benz Truck ML 55 AMG (163.174) V8-5.5L (113.981) 251
4) Shift transmission into neutral (N).
5) Push LOW RANGE switch. Depress brake pedal.
6) After shift motor has cycled, push LOW RANGE switch again. LOW RANGE light should go out at this time.
7) Confirm proper transfer case shift function: Cycle ignition and repeat steps 2-5.
Warning!
While performing the transfer case shift adaptation described above, take all necessary safety measures such as applying the parking brake and
holding the service brake firmly. (Failure to do so can result in unintended vehicle movement.)
Note:
The following allowable labor operations should be used when submitting a warranty claim for this repair.
Date: May 5, 2004
Order No.: T-B-28.19/05a
Supersedes: T-B-28.19/05 dated April 26, 2004
Group: 28
Revision: Technical Update
SUBJECT:
Model 163.154/157/174/175, as of Chassis # A346835 Low Range Light Flashes, Code P1831
If you receive customer reports in the above model vehicles of the low Range light flashing rapidly (18 times) after vehicle start with fault code
P1831 (Positioner motor, position sensor or power supply is faulty) in transfer case ECU, do not replace the transfer case motor. This is caused by
temporary loss of communication between transfer case control module and shift motor position sensor. To resolve, read out fault codes and cycle
transfer case shift motor by following the below procedure.
1) Read out and erase fault codes.
2) If fault codes other than P1831 are present, diagnose and repair accordingly (use appropriate damage code, operation code and time).
3) If fault code P1831 is present, start vehicle.
2000 Mercedes Benz Truck ML 55 AMG (163.174) V8-5.5L (113.981) 251
4) Shift transmission into neutral (N).
5) Push LOW RANGE switch. Depress brake pedal.
6) After shift motor has cycled, push LOW RANGE switch again. LOW RANGE light should go out at this time.
7) Confirm proper transfer case shift function: Cycle ignition and repeat steps 2-5.
Warning!
While performing the transfer case shift adaptation described above, take all necessary safety measures such as applying the parking brake and
holding the service brake firmly. (Failure to do so can result in unintended vehicle movement.)
Note:
The following allowable labor operations should be used when submitting a warranty claim for this repair.
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