BUSHING 1959315 - Caterpillar

Theft Deterrent Module ECM
The following is a list of codes that are associated with the Cat® Data Link of the machine.
Table 1
Theft Deterrent Module ECM (MID 436)
DTC Code Description System Response
248-12 Cat Data Link malfunction The service tool cannot detect the ECM.
Communication failures are indicated by another ECM. Each Cat Data Link circuit is an input and output of select electronic control modules. The data link is designed to carry communications between the electronic control modules. The data link is not a visible component. The data link consists of internal control circuits and the connecting harness wiring.This diagnostic code is recorded when the ECM cannot send information, or the ECM does not receive expected information from the data link (wire 892-BR(Brown)and wire 893-GN(Green)or wire 944-OR(Orange)and wire 945-BR(Brown)).The diagnostic code is caused by abnormal communications between the ECM and a specific ECM module via the Data Link. If a diagnostic code is present, correct the related diagnostic code.Possible causes for an FMI 12 diagnostic code are:
There is an open circuit or a short circuit on the data link.
There is a failure of the hardware for data link.The 248-9 DTC is used by the ECM as a companion code and indicates a Cat Data Link problem. This DTC indicates that the ECM has lost all communication with another ECM. This companion code is simultaneously activated with the 590-9 DTC.Note: The 248-9 DTC will never be activated by the ECM as a stand-alone diagnostic code.Note: The locations of the components of the MSS will vary between machines. If the MSS was installed by a Caterpillar dealer, consult the installation instructions for component locations. If the MSS was an attachment that was installed at the factory, consult the electrical schematic for that machine.Diagnostic Trouble Code Procedure
Note: Prior to beginning this procedure, inspect the harness connectors that are involved in this circuit. Poor connections can often be the cause of a problem in an electrical circuit. Verify that all connections in the circuit are clean, secure, and in good condition. Check the wiring for pinch points or abrasions. Look for and repair areas that indicate wires are exposed. If a problem with a connection is found, correct the problem and verify that this diagnostic code is active before performing a troubleshooting procedure.
Identify the active FMI code associated with the components.
Determine which code is present and use the list below to determine which procedure to follow.
FMI 12 diagnostic code, proceed to Table 2.
Table 2
FMI 12 Troubleshooting
Troubleshooting Test Steps Values Results
1. CLEAR THE DIAGNOSTIC CODES
A. Use the ET to clear the logged diagnostic codes.
B. Use a valid electronic key to start the machine.
Determine if CID 0248 FMI 12 is present.
CID 0248 FMI 12 is present. OK - CID 0248 FMI 12 is present. The problem was not caused by the use of an invalid electronic key.
Proceed to Test Step 2.
NOT OK - CID 0248 FMI 12 is NOT present. The problem was caused by the use of an invalid key in the key start switch.
STOP.
2.