The diagnostics of the transmission ECM are available to assist with the troubleshooting of detected faults. A service code is used to specify each fault. These service codes are shown in the display area of the Caterpillar Monitoring System. The service code is made up of three identifiers (MID, CID and FMI).
Module Identifier (MID) - The MID is a three-digit code that is shown on the display area. The MID is shown for approximately one second before the service code that is shown in the same area. The ECM that has diagnosed the fault is logged by the MID. The following examples are of some MID.
- Caterpillar Monitoring System ... 030
- Transmission ECM ... 081
Note: The MID of the transmission ECM is 081. When you are troubleshooting the transmission ECM ensure that the number 081 precedes the service code of the fault. The Caterpillar Monitoring System also shows service codes of the faults that are not related to the transmission ECM. The number 081 identifies the service codes that come from the transmission ECM.
Component Identifier (CID) - The components that are faulty are noted by the CID. These components are examples: solenoid valves and tilt lever position sensor. The CID is a four digit code that is shown on the display area. The CID and the FMI are shown together after the MID has been displayed. See Testing And Adjusting, SENR1390, "Troubleshooting Service Codes". This will show a list of CID codes for the ECM.
Failure Mode Identifier (FMI) - The FMI tells the type of failure that has occurred. The following situations are examples: voltage above normal, current below normal and abnormal frequency. The FMI is a two digit code that is shown on the display area. The CID and the FMI are shown together after the MID has been displayed. A decimal point "." precedes the FMI. See Testing And Adjusting, "Troubleshooting Service Codes".
The ECM does not have a display area for showing diagnostic information to service personnel. Diagnostic information concerning the transmission is sent on the CAT data link to the Caterpillar Monitoring System. Service personnel must be familiar with the Caterpillar Monitoring System in order to troubleshoot the transmission.
The service person can get faults from the third operator monitor mode. This mode continuously scrolls through the system faults for all of the controls on the machine. The service person cannot clear faults in this mode. The service person cannot hold faults in this mode. A service tool is not needed. The operator switch is installed on the machine.
The service mode of the Caterpillar Monitoring System allows service personnel to see the faults that are detected by the ECM, and you can troubleshoot the faults. While the Caterpillar Monitoring System is in the service mode, the service code for any detected fault of the transmission is shown in the display area of the Caterpillar Monitoring System. When service mode is first entered, all service codes for any detected faults scroll in the display area. For troubleshooting and clearing, the particular service code must be placed on hold. The display area alternates between showing the MID and then showing the CID FMI of the particular service code for the fault that is on hold.
The Caterpillar Monitoring System enters service mode when ground is applied to the service and clear inputs at the same time. The mode number 3 for service mode is shown in the display area. To place a service code for a fault on hold, ground the service input. To clear a service code for a fault on hold, ground the clear input. The Caterpillar Monitoring System exits service mode when the service inputs and clear inputs are grounded at the same time.
Note: The time that is required to clear faults and set faults can last from 1 to 60 seconds.
Refer to Systems Operation, SENR6717, "Caterpillar Monitoring System" for more information. Use Systems Operation, SENR6717 to see the method of displaying the faults of the transmission ECM. Use Testing And Adjusting, SENR1423 in order to troubleshoot the faults for the transmission ECM.