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Figure 4.1 - Reference: Output Voltage from an Analog Temperature Sensor. The diagram shown is for reference only and should not be used to troubleshoot Analog Sensors.Logged Events
The ECM can log events. Events refer to engine operating conditions such as low oil pressure or high coolant temperature. Logged events do not indicate an electronic system problem, but may indicate an engine system problem. The example diagram shown indicates the output voltage from an Analog Temperature Sensor and how the ECM responds to the output voltage. The diagram shown is only an example and should not be used to troubleshoot any particular analog sensor.Programmable Shutdown, Warnings And Derates
On some applications, shutdowns, warnings and derates are programmable. The Electronic Service Tool can be used to turn these features ON and OFF. When the features are turned ON, the display will appear on an electronic monitoring system display module (i.e. Caterpillar Monitoring System) and an Event will also be logged in the ECM. When a warning is turned OFF, it will not appear on the display module, but an Event will still be logged. Refer to Section 2 for additional information.Using the ECAP To Display ACTIVE Or LOGGED Diagnostic Codes
Figure 4.2 - ECAP Diagnostic Display Screen1. Connect an ECAP and Communication Adapter Tool to the Service Tool connector.2. Turn the keyswitch to the ON position, engine OFF.3. Select the Display Diagnostics/Events option from the menu.4. Each diagnostic code CID and FMI is listed on the left and followed by a text description.5. The ECAP also displays the number of times the diagnostic code occurs and the engine hours at the first and last occurrence of the diagnostic code.6. The diagnostic status display is located on the far right of the display window. (a) The ACTIVE bar indicates the diagnostic is occurring.(b) No text present, as shown on the first two diagnostics, indicates that two codes are logged but are not active.Using ET To Display ACTIVE Diagnostic Codes
Figure 4.3 - ET Active Diagnostic Code Screen1. Connect ET and the Communication Adapter Tool to the Service Tool connector.2. Turn the keyswitch to the ON position, engine OFF.3. Select the Display Active Diagnostics option from the Tools Menu.4. Each Diagnostic Code CID and FMI are listed on the left followed by a text description.Using ET To Display LOGGED Diagnostic Codes
Figure 4.4 - ET Logged Diagnostic Code Screen1. Connect ET and the Communication Adapter Tool to the Service Tool connector.2. Turn the keyswitch to the ON position, engine OFF.3. Select the Display Logged Diagnostics option from the Tools Menu.4. Each Diagnostic Code CID and FMI are listed on the left followed by a text description.Using ET Or ECAP To Display And Perform Sensor Calibrations
Figure 4.5 - Calibrate Sensors ScreenDiagnostic Terminology
Module Identifier (MID)Two or three digit code which is assigned to each module or control system. Component Identifier (CID)Two or three digit code which is assigned to each component or system.Failure Mode Identifier (FMI)Type of failure the component experienced (adopted from SAE standard practice J1587 diagnostics). Active CodeThe MID, CID and FMI can be sent through the CAT data link to a display module, or to the Communication Adapter Tool to the Electronic Service Tool (ET or ECAP) or various electronic display modules.Logged CodeThe diagnostic will be entered into permanent memory (Diagnostic Log) when it becomes Active. The number of occurrences will be saved in the good to bad counter in permanent memory (Diagnostic Log). First and last occurrence time (engine hours) will also be saved in the permanent memory (Diagnostic Log). This information is then available for display on the Electronic Service Tool (ET or ECAP) or various display modules.Reference Sheet For Diagnostic Codes