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| Illustration 1 | g03338350 |
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Schematic of the Cat Data Link | |
This diagnostic code is recorded when the Transmission ECM is not sending the necessary parameters to the Chassis ECM at the proper rate. The update rate for parameters that are generated by the Transmission ECM is not correct. The communication failure may be due to disconnected connectors or a faulty wiring harness.
The possible causes of this diagnostic code are listed:
- Software is installed on the Transmission ECM that is not correct.
- Software is installed on the Chassis ECM that is not correct.
- Incompatible software may be installed.
- The fuse for the Transmission ECM may have failed.
Test Step 1. CHECK THE TRANSMISSION ECM AND THE CHASSIS ECM FOR PROPER SOFTWARE VERSIONS.
- Use Cat ® Electronic Technician (Cat ET) to verify that the versions of software are compatible.
Note: Consult your Caterpillar Dealer for the correct part numbers of the flash software.
Expected Result:
The proper versions of software are installed on the Transmission ECM and the Chassis ECM.
Results:
- OK - The versions of software are compatible. Proceed to Test Step 2.
- NOT OK - The proper software is not installed.
Repair: Flash the proper software to the appropriate ECM. Cycle the keyswitch to initialize the new software. Ensure that the diagnostic code is no longer active.
STOP
Test Step 2. RECHECK FOR DIAGNOSTIC CODES.
- Ensure that the diagnostic code is active.
Expected Result:
The diagnostic code is inactive. The diagnostic code indicator is inactive.
Results:
- OK - The diagnostic code is inactive. The diagnostic code indicator is inactive.
Repair: Clear the diagnostic code.
STOP
- NOT OK - The diagnostic code is active.
Repair: Ensure that the proper software is installed before replacing the ECM. If the software is correct, the Transmission ECM may have failed. A failure of the ECM is unlikely. Exit this procedure. Perform this procedure again. Prior to replacing an ECM, always contact your dealership for possible consultation with Caterpillar. This consultation may greatly reduce repair time. If the ECM requires replacement, refer to Testing and Adjusting, "Electronic Control Module (ECM) - Replace".
STOP