GEAR ASSEM. 1G1506 - Caterpillar

Note: With the release of Tier 4 Final engines, additional emissions control system components have been added to the engine to reduce the NOx output. The addition of these components requires three Electronic Control Modules (ECMs) for the engine and aftertreatment systems to operate. The most recent version of Cat® Electronic Technician (ET) must be used when connecting to the Electronic Control Modules. Refer to Special Instruction, REHS8170 for instructions on properly setting up the computer and Comm3 adapter for use on Tier IV applications. When viewing the Diagnostic or Event Codes screens, ensure that the "Include All ECM's" box is checked.Override Parameters
The override parameters screen has multiple overrides. The parameters control various functions on the engine and CEM. These functions and features allow the technician to troubleshoot different engine systems.Cat ET Location
Connect to Cat ET.
Select the appropriate Electronic Control Module (ECM)
Select the Diagnostics tab.
Select the Diagnostic Tests tab.
Select the Override Parameter tab.Override Parameters Listed in the Engine ECM Menu
Engine Exhaust Manifold Bank #1 Flow Balance Valve Solenoid Override
The engine ECM will energize the exhaust balance valve solenoid to on or off. This override will be used when troubleshooting the exhaust balance valve.Fuel Priming Command Override
This override is used to verify that the ARD fuel diverter valve is working properly. The override activates the fuel priming pump. The diverter valve blocks the supply to the ARD head and allows fuel to flow into the engine fuel system.Ether injection Override
This override is used to activate the ether injection solenoid circuit to ensure that the circuit is working properly. The ether canister must be removed during testing of the ether solenoid circuit.Engine Fan Bypass
This override is used to turn ON the engine fan. The override can be used to test the engine fan operation. The engine fan speed is entered as a percent of full speed, this percent allows the user to operate the fan at different speeds.Overrides Parameters Listed in the Engine #1 Aftertreatment Controller Menu
Aftertreatment #1 DEF Dosing Control Module Key Switch Line
This override resets the Diesel Exhaust Fluid Control Unit (DCU) without having to cycle key power to the other ECM's. The reset ensures that the diesel exhaust fluid controller completes a purge cycle, resets any active codes, and shuts down correctly.This test turns off the keyswitch power from the A5:E2 Aftertreatment controller to the DCU for approximately 2 minutes. Once the DCU has successfully powered down and reset, the keyswitch power supply will be turned back on. The DCU will then be operational.Aftertreatment #1 Fuel Injector Heater #1 Override
This override activates the output for the heated nozzle in order to clean the nozzle. The output remains activated for approximately 1 hour. The engine coolant temperature must be greater than 60° C (140° F). The heat cycle will wait for an active regeneration to complete before starting. Once the override has been activated, the heat cycle will automatically start as soon as conditions have been met and cannot be deactivated. It could take up to 8 minutes