DIAGNOSTIC CODES
Poor performance may activate a code without illuminating the CHECK TRANS
light. Continued illumination of the CHECK TRANS light during vehicle
operation (not start-up) indicates the TCM/ECU has signaled a diagnostic code.
Up to five diagnostic codes may be recorded. Diagnostic codes may be read and
cancelled by one of the Allison DOC™ diagnostic tools or shift selectors shown
in Figure 16. Code reading, clearing methods, and complete code descriptions are
presented in the Troubleshooting Manual. Refer to the SERVICE LITERATURE
section for the publication number.
1
2
3
4
5
D
N
R
MODE
R
N
D
MODE
SHIFT
SELECTORS
ALLISON DOC™
PDA
PC
V07952.00.00
Figure 16. Shift Selectors, Allison DOC™ For PDA–Service Tool, and
Allison DOC™ For PC–Service Tool
DIAGNOSTICS
65
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