- The diagnostic trouble codes are displayed on the three transfer
case shift select buttons. The shift select buttons are located on the instrument
panel when the connector pin 13 on the data link cable is grounded, and
the ignition switch has been OFF for at least five seconds prior to positioning
the ignition switch to run the shift select buttons will blink various times
together in order to indicate a diagnostic trouble code from 1 to 4.
| 1.1. | Position the ignition switch to OFF. |
Ensure the ignition switch is positioned to OFF for at least 6 seconds.
| 1.2. | Connect pin 13 on the data link cable to a vehicle ground source. |
The data link connector is located in the cab under the instrument panel
on the drivers side.
| 1.3. | Position the ignition switch to RUN. |
| 1.4. | Note the shift select buttons for blinking codes. Refer to Diagnostic Trouble Codes
. |
- If the shift select buttons all blink one time and stop, and do
not continue to blink, no fault codes are stored in the TCCM.
- The transfer case shift select buttons will blink in order to
identify any stored DTC. If only one code is stored in the TCCM memory, that
code will blink repeatedly with a three second delay between blinking sequences.
If more than one code is stored, the first code will blink once, then after
a three seconds delay, the next code will blink. This sequence will continue
until pin 13 is no longer grounded.
- When reading the diagnostic trouble codes, the number of shift
select buttons blinks will indicate the code number.
