Circuit Description
At each power up the module runs a self test on the following:
Conditions for Setting the DTC
| • | Critical operational parameters stored in EEPROM have failed checksum
test indicating invalid data. |
| • | Masked ROM code has failed checksum test indicating that masked
ROM data is no longer valid. |
| • | ROM code has failed checksum test indicating that ROM data is
no longer valid. |
| • | One or more RAM locations have failed operational test indicating
that some portions of RAM are not functional. |
| • | Motor circuit test has indicated that the module's relay is not
able to make contact. |
Action Taken When the DTC Sets
The SERVICE AWD/4WD lamp will be latched on and the system will
be disabled.
Conditions for Clearing the MIL/DTC
| • | Replace the transfer case shift control module. |
| | Refer to Transfer Case Shift Control Module Replacement
. |
| • | Perform the Transfer Case Diagnostic System Check. |
