0397445 JOHNSON FUEL PUMP ASSY.

Override Parameters
The override parameters screen has multiple overrides. The parameters control various functions on the engine and the aftertreatment. These functions and features allow the technician to troubleshoot different engine systems.In the electronic service tool, select the engine ECM or the Diesel Exhaust Fluid Controller (DCU) as appropriate for the required override.Override Parameters Listed in the Engine ECM Menu
Aftertreatment #1 Intake NOx Level Sensor Power Supply Override
This override can be used during troubleshooting to reset the SCR intake NOx sensor without having to cycle key power to the Engine ECM.Aftertreatment #1 Outlet #1 NOx Level Sensor Power Supply Override
This override can be used during troubleshooting to reset the SCR Outlet NOx Sensor without having to cycle key power to the Engine ECM.Aftertreatment #1 DEF Dosing Control Module Key Switch Line
This override resets the Dosing Control Unit (DCU) without having to cycle key power to the other ECM's. The reset ensures that the DCU completes a purge cycle, resets any active codes, and shuts down correctly.This test turns off the key switch power from the engine ECM to the DCU for approximately 2 minutes. Once the DCU has successfully powered down and reset, the key switch power supply will be turned back on. The DCU will then be operational.Engine Fan Bypass
This override is used to turn ON the engine fan, if equipped. The override can be used to test the engine fan operation. The engine fan speed is entered as a percent of full speed, allowing the user to operate the fan at different speeds.Engine Fuel Supply Lift Pump Relay Override
This override is used to energize the Electric Fuel Lift Pump (EFLP) relay. The override can be used to test the EFLP relay only when engine speed is zero. The EFLP relay is switched to either ON or OFF.Engine Shutdown Lamp
This override provides the facility to test the electrical circuit for the Engine Shutdown Lamp. The override commands the Engine Shutdown Lamp on.Ether Starting Aid Override
This override is used to confirm the correct operation of the ether system. Remove the ether canister from the system before testing the ether injection system. Refer to Troubleshooting, "Ether Starting Aid - Test". The override requires that engine speed must be zero. The override will be unavailable for a short duration if glow plugs are active.Glow Plug Starting Aid Override
This override is used to check that the glow plugs are functioning correctly. The override requires that engine speed must be zero. The override will be unavailable for a short duration if ether injection is active.Override Parameters Listed in the Diesel Exhaust Fluid Controller (DCU) Menu
DEF Coolant Diverter Valve Solenoid Override
This override is used to check the electrical operation of the coolant diverter valve solenoid. This override will open the coolant diverter valve. This override allows coolant to flow through the PEU assembly. This test can be used to verify that the coolant diverter valve is working correctly.Unless the function is disabled, the override will remain enabled for 5 minutes.DEF Dosing Injector Override
This override is used to check the solenoid operation of the DEF Dosing Injector. The test verifies that the injector opens and closes correctly.This test is only available when no engine speed is present.Unless the function is disabled, the override will remain enabled for 5 minutes.DEF Dosing Pump Motor Override
This override is used to check the operation of the DEF Dosing Pump Motor. The override will supply current to the motor. This test verifies that the pump motor is working correctly.This test is only available when no engine speed is present.Unless the function is disabled, the override will remain enabled for 5 minutes.Note: This override will only test the reverse (purge) function of the pump motor. Forward motion is not available.Line Heaters 1, 2 and 3
These overrides are used to check the electrical operation of the individual line heaters. This test can be used to verify that each line heater is working correctly.Unless the function is disabled, the override will remain enabled for 5 minutes.System Troubleshooting Settings
The "System Troubleshooting Settings" screen will allow overrides to be enabled.In the electronic service tool, select the engine ECM or the Diesel Exhaust Fluid Controller (DCU) as appropriate for the required override.System Troubleshooting Settings Listed in the Engine ECM Menu
Engine Emissions Operator Inducement Service Mode Override
The override is used by service technicians to stop the inducement counter and disable engine restrictions due to inducement to troubleshoot. Once the override is activated, the operator can navigate to other functions in the electronic service tool.Factory passwords are required to perform this override as the engine will be operating outside of the emissions window.Injector Disable Override
This override will allow the user to disable the injectors from activating when performing certain troubleshooting procedures.SCR Thermal Management Active Override
This override will disable SCR thermal management (HC dosing) whilst performing certain troubleshooting procedures. Once the override is activated, the operator can navigate to other functions in the electronic service tool.Active Diagnostic Codes
The purpose of this screen is to show all the active diagnostic codes.In the electronic service tool, select the engine ECM or the Diesel Exhaust Fluid Controller (DCU) as appropriate.Select the "Diagnostics" tab.Select the "Active Diagnostic Codes" tab.Tab Functions At Bottom of Screen
Reset All
This tab will reset all the active codes.Troubleshoot Code
This tab is not available for Tier 4 engines. Refer to Troubleshooting, "Diagnostic Trouble Codes" for further information.Troubleshoot Symptom
This tab is not available for Tier 4 engines. Refer to Troubleshooting, "Diagnostic Trouble Codes" for further information.Logged Diagnostic Codes
The purpose of this screen is to show all the logged diagnostic codes.In the electronic service tool, select the engine ECM or the Diesel Exhaust Fluid Controller (DCU) as appropriate.Select the "Diagnostics" tab.Select the "Logged Diagnostic Codes" tab.Tab Functions At Bottom of Screen