WASHER-THRUST 8U0746 - Caterpillar

"Diagnostic" Lamp
Use the "DIAGNOSTIC" lamp or a Cat electronic service tool to determine the diagnostic flash code.Use the following procedure to retrieve the diagnostic codes if the engine is equipped with a "DIAGNOSTIC" lamp:
Turn the cruise control "ON/OFF" switch to the OFF position.
Move the "SET/RESUME" switch to either position. Hold that position until the "YELLOW" lamp begins to flash.The "YELLOW" lamp will flash in order to indicate a two-digit flash code and the "SET/RESUME" switch may be released. The sequence of flashes represents the system diagnostic message. Count the first sequence of flashes in order to determine the first digit of the diagnostic code. After a two second pause, the second sequence of flashes will identify the second digit of the diagnostic code.Any additional diagnostic codes will follow after a pause. The additional diagnostic codes will be displayed in the same manner. Flash Code 55 signals that no detected faults have occurred.Refer to the Troubleshooting Guide or consult an authorized Cat dealer for the following items.
Further information
Assistance for repairs
TroubleshootingThe electronic diagnostic codes are listed and described in Table 1.Note: Table 1 indicates the potential effect on engine performance with "ACTIVE" flash codes.Some codes record events or some codes indicate that a mechanical system needs attention rather than indicating a performance problem. Troubleshooting is not required for codes "35", "41", "47" and "55". Code "01" will not flash. Some codes will limit the operation or the performance of the engine.Table 1 indicates the potential effect on the engine performance with active flash codes. Table 1 also forms a list of Electronic diagnostic codes and descriptions.
Table 1
Diagnostic Flash Code or Engine Performance Relationship for C-12 Truck Engine    
Diagnostic Flash Code     Effect On Engine Performance (1)     Suggested Action of the Operator    
Engine Misfire Low Power Lower
Engine Speed     Engine Shut-
down     Shut
Down
the
Engine (2)     Ser-
vice (3)     Sche-
dule Service ASAP (4)    
01     Idle Shutdown Override