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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
Aftertreatment #1 Fuel Injector Heater #1 Override
This override activates the output for the heated nozzle 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 when conditions have been met and cannot be deactivated. It could take up to 8 minutes for conditions to be met for the heat cycle to turn on after being activated by the override. The heat cycle stops if the engine is stopped. The heat cycle continues when the engine is started. Active regenerations will not occur until the heat cycle is complete. This override will be used if a system malfunction was not allowing current to flow to ARD nozzle heater. Lack of current flow could be caused by a blown fuse, broken heater wire, and other damaged components.Aftertreatment Fuel Pump Relay Override
The Engine #1 Aftertreatment Controller will allow the ARD fuel pump to provide fuel to the CEM. This override will be used when pressure testing the ARD fuel pump.ARD Air Pressure Control Position Override
The ECM sends a command to the ARD air valve to open to a specified percentage. The override is used to check the operation of the valve while disassembled.ARD Fuel Flow Diverter Actuator Override
This override is used to cycle the position of the diverter valve on the ARD fuel pump. The diverter valve changes the path of the fuel between the engine and the CEM.DPF Differential Pressure Line Override
This override when Activated, will ignore any fault code from the DPF Delta P sensor. This override will be used when using the DPF crack detection procedure.DEF Coolant Diverter Valve Solenoid Override
The override is used to check the solenoid and diverter valve harness electrically. This override will open the coolant diverter valve which allows coolant to flow through the PETU assembly. This test can be used to verify that the coolant diverter valve is working properly.DEF Dosing Injector Override
This override allows the user to test the electrical circuit for the DEF injector. The override commands the DEF injector to open. This override only operates when there is no engine speed.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.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.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.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.System Troubleshooting Settings
The "System Troubleshooting Settings" screen will allow overrides to be enabled.Cat ET Location
Connect to Cat ET and select the appropriate ECM.
Select the Diagnostics tab.
Select the Diagnostic Tests tab.
Select "System Troubleshooting Settings".System Troubleshooting Settings Listed in the Engine ECM Menu
Aftertreatment #1 Ignition Transformer Primary Override
This override will energize the ARD ignition system to on or off. This override will be used when troubleshooting the ARD ignition system.ARD Regeneration Override
This override will allow the user to perform a regeneration that is similar to the operator using the force switch.Note: This override does not have any enhanced diagnostic ability. All regeneration system troubleshooting should utilize the service tests and not this override.Injector Disable Override
This override will allow the user to disable the injectors from activating when performing certain troubleshooting procedures.Injector Disable Override
This override will allow the user to disable the injectors from activating when performing certain troubleshooting procedures.Operator Inducement Service Mode
The override is used by service technicians to stop the inducement counter and disable engine restrictions due to inducement to perform troubleshooting. Once the override is activated, navigation of other ET functions is possible.This override allows the service technician to disable the inducement to troubleshoot problems. Factory passwords are required to perform this override as the engine will be operating outside of the emissions window.Active Diagnostic Codes
The purpose of this screen is to show all the active diagnostic codes.Cat ET Location
Connect to Cat ET.
Select the appropriate Electronic Control Module (ECM)
Select the Diagnostics tab.
Select the Active Diagnostic Codes tab.Tab Functions At Bottom of Screen
Reset
This tab will clear specific codes when highlighted.Reset All
This tab will reset all the active codes.Troubleshoot Code
This tab is not available for Tier 4 engines. Refer to the Troubleshooting guide.Troubleshoot Symptom