RING 0996523 - Caterpillar

Transmission ECM
The following is a list of Diagnostic Trouble Codes (DTCs) that are associated with the CAN data link of the machine.
Table 1
Transmission ECM (MID 81)
DTC Code Description System Response
871-9 Inclination Sensor: Abnormal update rate Automatic Retarding will not function.
967-9 Machine Application: Abnormal update rate This failure results in events that are logged against the Transmission ECM that cannot be explained directly. The Transmission ECM cannot communicate with the Machine Application module or appears to communicate intermittently.
967-14 Machine Application: Special Instruction Software will run in a generic state and all software features related to the machine control are disabled.
Table 2
Implement ECM (MID 82)
DTC Code Description System Response
967-9 Machine Application: Abnormal update rate This failure results in events that are logged against the Transmission ECM that cannot be explained directly. The Transmission ECM cannot communicate with the Machine Application module or appears to communicate intermittently.
967-14 Machine Application: Special Instruction Software will run in a generic state and all software features related to the machine control are disabled. Possible causes for an FMI 9 diagnostic code are:
The ECM has failed.
An ECM software problem.
A short circuit to ground or to another circuit.
An open or a poor connection in the Can Data Link circuits near the ECM.
One of the ECMs or smart devices has failed. This condition is unlikely.Possible causes for an FMI 14 diagnostic code are:
A fuse for one of the ECM modules may have failed.
The software is incorrect or incompatible for one of the modules within the data link.
The machine harness has failed.
A new ECM has been installed that is not the correct part.
One of the ECM modules in the data link has failed.
Illustration 1 g06157392
Schematic of the CAN Data Link
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.
Table 3
Troubleshooting Test Steps Values Results
1. Identify The Active FMI Code Associated With The Cat Data Link
Code present. FMI 9 diagnostic code, proceed to Test Step 2.
FMI 14 diagnostic code, proceed to Test Step 3.
Begin Process For FMI 9 Troubleshooting HERE
2. Check The Data Link For An Open
A. Turn key start switch and disconnect switch OFF.
B. At the ECM, disconnect the harness connector.
C. At the harness connector, connect a jumper wire between the data link positive contact and data link negative contact.
D. Measure the resistance.
The resistance measurement is less than 5Ω. OK - The resistance is less than 5Ω.
Proceed to Test Step 4.
NOT OK - The resistance is greater than 5Ω.
Repair: The open circuit is most likely in the ECM harness connector or in a connector that is close to the ECM.
Proceed to