FREE REPAIR MANUALS & LABOR GUIDES 1982-2013 Vehicles
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CAB Check Sum

Symptom
CAB CHECK SUM

Set Condition: When the sum of all storage bytes are not equal to the original sum stored.

POSSIBLE CAUSES
- INTERMITTENT CAB CHECK SUM DTC
- DAMAGED CAB/CAB HARNESS CONNECTOR
- FUSED OPTIONAL EQUIPMENT RELAY OUTPUT CIRCUIT OPEN
- FUSED B(+) CIRCUIT OPEN
- GROUND CIRCUIT OPEN
- CAB FAILURE

Test 1 - Test 2:




Test 3 - Test 6:





CAB CHECK SUM