Electronic Control Module (ECM) - Replace
Prior to replacing an electronic control module (ECM), ensure that replacement is necessary. The ECM is seldom the cause of a failure. Always check that power is available at all "+ Battery" contacts of the ECM.
Corrupted configuration software or the wrong software may cause an ECM to report false diagnostic codes. Prior to replacing the ECM, flash the ECM with the correct configuration software to verify that the failure is not related to software.
Reference: Testing and Adjusting, "Electronic Control Module (ECM) - Flash Program"
Note: Prior to replacing an ECM, contact your Technical Communicator.
If the ECM must be replaced, follow these steps:
- Connect the Cat® Electronic Technician (Cat® ET).
- Note all configurations.
- Turn off the disconnect switch and the key start switch.
- Disconnect the harness connectors from the ECM.
- Verify that the replacement ECM part number is correct.
- Install the replacement ECM.
- Connect the harness to the ECM.
- Turn on the disconnect switch and the key start switches.
- Check for correct configurations.
If necessary, use Cat® ET to install the configuration software.
Reference: Testing and Adjusting, "Electronic Control Module (ECM) - Flash Program"
- Clear any diagnostic codes that were caused by the previous procedures.
- Verify that the ECM operates correctly.
Caterpillar Information System:
789D CMD Off-Highway Truck Chassis Electronic Control System (Command For Hauling) Electronic Control Module (ECM) - Flash Program
789D CMD Off-Highway Truck Chassis Electronic Control System (Command For Hauling) Wiring Harness (Short Circuit) - Test
789D CMD Off-Highway Truck Chassis Electronic Control System (Command For Hauling) Wiring Harness (Open Circuit) - Test
789D CMD Off-Highway Truck Chassis Electronic Control System (Command For Hauling) Electrical Connector - Inspect
789D CMD Off-Highway Truck Chassis Electronic Control System (Command For Hauling) Tire Sensor - Set
789D CMD Off-Highway Truck Chassis Electronic Control System (Command For Hauling) Position Sensor (Body) - Calibrate
789D CMD Off-Highway Truck Chassis Electronic Control System (Command For Hauling) Electrical Output Components
789D CMD Off-Highway Truck Chassis Electronic Control System (Command For Hauling) Machine Electronic Control Module (Chassis)
789D CMD Off-Highway Truck Chassis Electronic Control System (Command For Hauling) Electrical Input Components
789D CMD Off-Highway Truck Chassis Electronic Control System (Command For Hauling) System Operation
789D CMD Off-Highway Truck Chassis Electronic Control System (Command For Hauling) General Information
789D CMD Off-Highway Truck (Command for Hauling) Braking Electronic Control System Event Code List
789D CMD Off-Highway Truck Chassis Electronic Control System (Command For Hauling) Electronic Control Module (ECM) - Configure
M315D2 and M317D2 Wheeled Excavators Prepare the Machine for Maintenance
24 Motor Grader Power Train Modulating Valve (Torque Converter Lockup Clutch) - Remove and Install
Hose Clamp Retention Information for 794 AC Off-Highway Truck has Changed {4257, 4304, 5057, 7510, 7540, 7554} Hose Clamp Retention Information for 794 AC Off-Highway Truck has Changed {4257, 4304, 5057, 7510, 7540, 7554}
S3015, S3025 and S3035 Demolition and Scrap Shears Swivel - Remove
24 Motor Graders Engine Supplement Engine Support (Rear) - Remove and Install
Coolant May Overflow During Engine Warm Up on Certain 785C and 789C Off-Highway Trucks {1070, 1380} Coolant May Overflow During Engine Warm Up on Certain 785C and 789C Off-Highway Trucks {1070, 1380}
Improved Thrust Washer and Wheel Bearing Retainer Are Now Used on Certain 824K Wheel Dozers and 826K Landfill Compactors {4051} Improved Thrust Washer and Wheel Bearing Retainer Are Now Used on Certain 824K Wheel Dozers and 826K Landfill Compactors {4051}
S3015, S3025 and S3035 Demolition and Scrap Shears Swivel - Remove
789D and 789D XQ Off-Highway Trucks Pump Drive Shaft Universal Joint - Inspect
Repair Option for Shaft Assembly Spalling on Certain Integrated Toolcarriers, Wheel Loaders, and Wheel Skidders {3030, 3063, 3155, 3169, 3170} Repair Option for Shaft Assembly Spalling on Certain Integrated Toolcarriers, Wheel Loaders, and Wheel Skidders {3030, 3063, 3155, 3169, 3170}
S3015, S3025 and S3035 Demolition and Scrap Shears Gear and Bearing - Remove and Install