859187A 1 Mercury SENDER ASSEMBLY, Trim

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
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.Override Parameters Listed in the Selective Catalyst Reduction System Menu
DEF Dosing Control Module Key Switch Line Test
This override resets all the Diesel Exhaust Fluid Control Units (DCU's) without having to cycle key power to the other ECM's. The reset ensures that each 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 Selective Catalyst Reduction Controller to each DCU for approximately 2 minutes. Once each DCU has successfully powered down and reset, the keyswitch power supply will be turned back on. Each DCU will then be operational.Aftertreatment #1 Line Heater #5 State Override
This override activates the output for DEF Line Heater #5 which is the DEF ground level fill circuit. This circuit consists of 3 separate heaters, and this override activates all the line heaters associated with the ground level fill.Override Parameters Listed in each of the Diesel Exhaust Fluid Controller Menu's
Aftertreatment DEF Backflow Valve Override
This override allows the user to test the electrical circuit for the backflow valve. This override commands the DEF backflow valve to a known position. This test can be used to make sure that the DEF backflow valve is working properly.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.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
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 perform troubleshooting. Once the override is activated, navigation of other Cat 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
This tab is not available for Tier 4 engines. Refer to the Troubleshooting guide.Logged Diagnostic Codes
The purpose of this screen is to show all the logged diagnostic codes.Cat ET Location
Connect to Cat ET.
Select the appropriate Electronic Control Module (ECM).
Select the "Diagnostics" tab.
Select the "Logged Diagnostic Codes" tab.Tab Functions At Bottom of Screen
Clear
This tab will clear specific codes when highlighted.Clear All
This tab will clear all logged diagnostic codes.Troubleshoot Code
This tab is not available for Tier 4 engines. Refer to the Troubleshooting guide.Troubleshoot Symptom
This tab is not available for Tier 4 engines. Refer to the Troubleshooting guide.Active Event Codes
The purpose of this screen is to show all the active event codes.Cat ET Location
Connect to Cat ET.
Select the appropriate Electronic Control Module (ECM).
Select the "Diagnostics" tab.
Select the "Events" tab.
Select the "Active Events" tab.Tab Function At Bottom of Screen
Reset
This tab will clear specific codes when highlighted.Reset All
This tab will reset all the active codes. Some of the event codes will "latch" to active status. Repairing the system will not "unlatch" the event codes and the event codes must be reset with Cat ET.