SENSOR 7T7757 - Caterpillar

Electronic Technician Service Tool
When an abnormal system operating condition occurs, the status screen on Cat ET will indicate that there is an active event.Event codes are displayed on Cat ET in the following format:EXXXX Description of the codeThe "E" indicates that the code is an event code. The "XXXX" is a numeric identifier. The numeric identifier is followed by a description of the code. Active event codes are listed in ascending numerical order. The code with the lowest number is listed first. The active event code is removed from the list when the condition is no longer present.Logged Event Codes
All of the Events that are activated by the Implement ECM are logged. Level 1 events are logged only. The Monitoring System Display will not give any indication that a level 1 event is active. When level 2 or Level 3 events are active, the events will be logged and an event active message will be displayed on the Monitoring System Display.Logged event codes are listed in chronological order. The most recent code is listed first.A logged code is cleared from memory when one of the following conditions occur:
The service technician manually clears the code.
The code does not reoccur for 1000 hours.
A new code is logged and there are already ten logged codes in memory. In this case, the oldest logged code is cleared.Troubleshooting
General Troubleshooting Guidelines
Perform the following steps in order to troubleshoot an event:
Obtain the following information from the operator:
The event and the time of the event
Determine the machine operating conditions at the time of the event. Conditions such as engine rpm, machine load, or operating environment may be important.
Determine if there are any systems that were installed by the dealer or by the customer that could cause the event.
Verify that the event is not due to normal machine operation. Verify that the event is not due to an error in the operation of the machine.
Attempt to reset the active Event in order to determine if the cause was due to a momentary condition.
Check all fluid levels and all oil levels.
Generally, an active event and an active diagnostic code for a related circuit will not be active at the same time. However, always check for active diagnostic codes that are related to the active event condition. Troubleshoot and repair the cause of any diagnostic codes that are active when an event is activated.
Locate the EID code for the active event that is listed in the following table and follow the recommended actions. The recommended actions that are suggested in the table are presented as a guide to machine system conditions that could cause the event to be activated. The specific cause of a particular event cannot always be predicted. Use the recommended actions as a guide and investigate any other conditions or circumstances that may indicate the cause of a specific active event.Note: If a level 3 steering system event is activated, the event will be latched. Once the condition that has caused the event is resolved, the