TUBE 3044501 - Caterpillar

Table 1
Diagnostic Codes Table    
Code and Description    Conditions which Generate this Code    System Response    
1273-09 Transmission Control abnormal update rate     The engine Electronic Control Module (ECM) loses communication with the chassis ECM.
Communication with the transmission control cannot be established within three seconds after the Electronic Control Module (ECM) is powered up. After communication with the transmission control has been established, communication stops for one second.     The ECM will log the diagnostic code. All features that depend on input from the chassis ECM will be affected.
The ECM will disable the automatic control of engine speed through the throttle lock feature.    
1273-14 Chassis Control Module special instruction     After successful communication has been established, the engine Electronic Control Module (ECM) has not received all the information that was requested over the Cat Data Link from the chassis ECM.
There is at least one parameter that is requested by the engine ECM that is not being received.     The ECM will log the diagnostic code. All features that depend on the missing data will be affected.
The ECM will disable the automatic control of engine speed through the throttle lock feature.    Note: If the -14 code is present, ensure that the flash files for the machine's control modules are current. If all of the flash files are current, contact the Dealer Solution Network (DSN) for information that is related to troubleshooting the problem further.Note: This procedure checks for an open circuit or for a short circuit in the Cat Data Link. If you are experiencing problems with communications between Caterpillar Electronic Technician (ET) and the ECM, refer to Troubleshooting, "Electronic Service Tool Does Not Communicate" before you use this procedure.The Cat Data Link is the standard data link that is used by the ECM to communicate with Cat ET. The ECM communicates with Cat ET in order to share status information and diagnostic information. Cat ET can also be used to configure the ECM parameters.
Illustration 1 g01348728
Typical schematic for the Cat Data LinkTest Step 1. Inspect the Electrical Connectors and the Wiring
Remove electrical power from the ECM.
Illustration 2 g01167488
Engine view (typical example) (1) J1/P1 ECM connectors
Thoroughly inspect connector (1). Refer to Troubleshooting, "Electrical Connectors - Inspect".
Illustration 3 g01104274
P1 terminals that are associated with the Cat Data Link (P1-8) Cat Data Link + (P1-9) Cat Data Link −
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the Cat Data Link.
Check the allen head screw on each ECM connector for the proper torque. Also, check the allen head screw on the customer connector for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.Expected Result:All connectors, pins, and sockets are completely inserted and coupled. The harness and wiring are free of corrosion, of abrasion, and of pinch points.Results:
OK - The harness and the connectors appear to be OK. Proceed to Test Step 2.
Not OK - The connectors and/or the wiring are not OK.Repair: Repair the connectors and/or