Test Description

The numbers below refer to the step numbers on the diagnostic test.

1. 2
   
   Lack of communication may be due to a partial malfunction of the class 2 serial data circuit or due to a total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular condition.
2. 3
   
   Perform diagnostics for powertrain DTCs first before addressing other DTCs. They can be responsible for setting other DTCs.
3. 4
   
   The presence of DTCs indicates that the transfer case shift control module has detected a fault. Go to symptoms for other concerns.