Circuit Description
The transfer case shift control module uses the VIN information for calculations that are required for the different calibrations used based on axle ratio, transmission, tire size, and engine. The system does not know which calibration to use without this information.
Conditions for Setting the DTC
The transfer case shift control module does not receive a valid VIN digit for the correct application, K truck, L van or T truck within 2 seconds after power up.
Action Taken When the DTC Sets
| • | The ignition counts since last fault will be cleared. |
| • | The system will be disabled until valid VIN data is received. |
| • | The SERVICE 4WD indicator will be latched on. |
Conditions for Clearing the DTC
A history DTC will clear after a valid VIN digit is received.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
Tests whether the condition is module, system or condition related.
-
Tests whether the condition has been corrected or identified as specified in the supporting text.
-
Replaces the transfer case shift control module.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Transfer Case Control Schematics | |||
1 | Was the Transfer Case Diagnostic System Check performed? | Go to Step 2 | |
2 |
Does the scan tool indicate that DTC C0611 is current? | Go to Step 4 | Go to Step 3 |
Since most occurrences of this DTC are caused by the installation of a new transfer case shift control module while the ignition is in the ON position, review the transfer case system or, with the customer to verify the conditions under which the DTC set. Did vehicle operation cause this DTC to set? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 4 | |
Does the DTC reset? | Go to Step 5 | System OK | |
Replace the transfer case shift control module. Refer to Transfer Case Shift Control Module Replacement . Is the repair complete? | Go to Step 6 | -- | |
6 |
Does the DTC reset? | Go to Step 2 | System OK |
