PLATE 3376685 - Caterpillar

This diagnostic code is for the CAT Data Link.CID 0248 FMI 09 is for the D10R and for the D11R. This diagnostic code is recorded when the power train ECM does not receive the information on engine speed. The power train ECM may log a CID 0168 FMI 04 diagnostic code for low battery voltage during engine cranking. The possible causes of this diagnostic code are listed below:
There is a poor electrical connection at a machine harness connector.
The circuit for the CAT Data Link in the machine harness is open.
The circuit for the CAT Data Link in the machine harness is shorted to ground.
The circuit for the CAT Data Link in the machine harness is shorted to positive voltage.
The engine ECM has lost power or the engine ECM has failed. Note: During flash programming of an ECM, the ECM does not perform the normal data link communications with the other Electronic Control Modules on the machine. When you flash program an ECM, the other Electronic Control Modules may record a CID 0248 FMI 09. Also, a CID 0248 FMI 02 may be recorded. In these cases, after the flash programming is completed, the diagnostic code indicator will NOT show "SERV CODE" for the CID 0248. The CID 0248 diagnostic code can be cleared. If the diagnostic code indicator does not show "SERV CODE" for a CID 0248, DO NOT replace any ECM on a machine. Note: Ensure that the CID 0248 FMI 09 is on hold and that the diagnostic code indicator shows "SERV CODE". Test Step 1. CHECK THE +BATTERY CIRCUIT AT THE CONNECTORS OF THE ECM.
Turn the disconnect switch to the OFF position.
Disconnect the harness connectors from the ECM.
Turn the disconnect switch to the ON position.
At the harness connector, connect the positive lead of the multimeter to J1-1 and connect the negative lead of the multimeter to J1-2.
Measure the voltage. Expected Result:The voltage should measure 21.3 to 32.5 VDC. Results:
OK - The voltage measures 21.3 to 32.5 VDC. The engine ECM is receiving the correct power. Proceed to Test Step 2.
NOT OK - The voltage does not measure 21.3 to 32.5 VDC. Repair: The engine ECM is NOT receiving the correct power. The power circuit to the engine ECM inthe machine harness has failed. Repair the power circuit to the engine ECM.STOPTest Step 2. INSPECT THE HARNESS CONNECTORS.
Turn the disconnect switch to the OFF position.
Inspect the machine harness connectors that are related to CAT Data Link circuits. Expected Result:The connector contacts are clean and tight.Results:
OK - The connector contacts are clean and tight. Proceed to Test Step 3.
NOT OK - The connector contacts are not clean and tight. Repair: Repair the connectors of the machine harness or replace the connectors of the machine harness. STOPTest Step 3. CHECK FOR A SHORT CIRCUIT TO GROUND.
The disconnect switch remains OFF.
Disconnect the machine harness from all electronic control modules that use the