PLATE 2596764 - Caterpillar

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Transmission/Chassis ECM Power and Ground connections
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Circuit Breaker Panel located in the engine compartment behind the right rear wheel
(1) Battery Circuit Breaker (150 amp)
(2) Main circuit Breaker (80 amp)
(3) Load Circuit Breaker (80 amp) The Transmission/Chassis ECM receives system power through the transmission control circuit breaker. The Transmission/Chassis ECM is connected to the machine system power at five contacts on the J1 connector. The Transmission/Chassis ECM is connected to the machine frame ground at four contacts on the J1 connector. Other ground connections are used for the location code contacts, however, these connections are not used for operating grounds.An ECM must lose power at each of the five connections to lose all power completely for the ECM. There are conditions that can cause complete loss of power to the ECM. An open transmission control circuit breaker will cause a loss of power. An open or a faulty connection in certain sections of the machine harness could cause a complete loss of power. An open or poor ground connections can also cause a loss of power to the ECM.If power is lost to the Transmission/Chassis ECM or to another ECM on the machine, the ECM that has lost power will not activate any diagnostic codes. When this condition occurs, a large amount of machine functions will not operate. The other ECM modules on the machine will activate multiple diagnostic codes.If multiple diagnostic codes have been activated within a short amount of time, check the power circuits for the ECM before investigating individual components. If the power circuits for the ECM controls are OK, look for a common factor for the components that have the active diagnostic codes. Some common factors are shared grounds or power circuits. An individual component is not always the cause of the problem when more than one or two diagnostic codes are activated at the same time.The following lists give examples of multiple diagnostic codes and events that will most likely to be activated when a particular ECM has lost power:Loss of Power to the Implement ECMCID 0248 FMI 09 - CAT Data Link - Logged by: Transmission/Chassis ECM, Implement ECM, Implement ECM 2, Messenger ECM, and AWD ECM (if attached).CID 0596 FMI 09 - Implement ECM - Activated by: Transmission/Chassis ECM, Engine ECM, Implement ECM 2, and the MessengerLoss of Power to the Implement ECM 2CID 0247 FMI 09 - SAE J1939 Data Link - Logged by: Transmission/Chassis ECM, and Implement ECM.CID 0248 FMI 09 - CAT Data Link - Logged by: Transmission/Chassis ECM, Implement ECM, Implement ECM 2, Messenger ECM, and AWD ECM (if attached).CID 0615 FMI 03 - Articulation Angle Sensor 1 - Logged by: Transmission/Chassis ECM.CID 1558 FMI 03 - Implement ECM 2 - Logged by: Transmission/Chassis ECM, Implement ECM, Messenger ECM, and AWD ECM (if attached).CID 1471 FMI 03 - Steer Position Sensor 1 - Activated by: Transmission/Chassis ECMCID 1472 FMI 03 - Steer Position Sensor 2 - Activated by: Transmission/Chassis ECMCID 2199 FMI 03 - Secondary Steer Request