- The diagnostic trouble codes are displayed on the three transfer
case shift select buttons. The shift select buttons are located to the right
of the instrument panel cluster. When pin 13 of the data link connector is
grounded, and the ignition switch has been in the OFF position for at least
five seconds prior to positioning the ignition switch to the RUN position,
the shift select buttons will blink a number of times 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 5 seconds.
| 1.2. | Connect pin 13 on the data link connector 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. |
- 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 second 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.
