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.
Navigate to the following menu options in the electronic service tool to access the "Override Parameters":
- Diagnostics
- Diagnostic Tests
- Override Parameters
Glow Plug Starting Aid Override
This override is used to check that the glow plugs are functioning correctly. The override will remain active until switched off using the electronic service tool.
DEF Pressure Line Heater Override
This override switches on the line heater for the DEF pressure line. The override will remain active until switched off using the electronic service tool.
DEF Backflow and Suction Line Heater Override
This override switches on the line heater for the DEF return line and the DEF suction line. The override will remain active until switched off using the electronic service tool.
This override switches on the heater for the DEF pump module. The override will remain active until switched off using the electronic service tool.
The purpose of this screen is to show all the active diagnostic codes.
In the electronic service tool, select the engine ECM.
Select the "Diagnostics" tab.
Select the "Active Diagnostic Codes" tab or the "Active Event Codes" tab.
The purpose of this screen is to show all the logged diagnostic codes. Logged diagnostic codes will be cleared from the "Logged Diagnostic Codes" screen when the code has not been active for 40 hours.
Note: Logged operator inducement diagnostic codes will not be cleared from the "Logged Diagnostic Codes" screen after 40 hours.
In the electronic service tool, select the engine ECM.
Select the "Diagnostics" tab.
Select the "Logged Diagnostic Codes" tab or the "Logged Event Codes" tab.
Electronic service tool diagnostic tests are listed below.
Select the "Diagnostics" tab.
Select the "Diagnostic Tests" tab.
This test can disable individual cylinders to when the engine is running to help identify cylinders that are performing below the required level.
Click "Change" for an individual cylinder to switch off that cylinder manually. The cylinder will be automatically re-energized 10 seconds after the cylinder has been switched off. Wait a further 10 seconds before disabling the next cylinder.
This test can be used to identify faults by listening to the sound of the engine as a cylinder is disabled. If there is no change in the sound of the engine as a cylinder is disabled, there may be a fault in that cylinder.
This test raises the fuel pressure in the high-pressure fuel rail to
After this test has been run, allow the fuel pressure to drop to a safe level. The fuel system can then be inspected for signs of leakage.
DEF Dosing System Accuracy Test
This test is used with the DEF Test Kit to measure the amount of DEF that the SCR dosing system is delivering. The test can also be used to confirm that there is an acceptable spray pattern from the DEF Injector.
Note: The DEF injector must be removed from the exhaust system during this test and placed in an appropriate container. Failure to do so could result in issues with the SCR system operation. Refer to Testing and Adjusting, "Aftertreatment SCR System Dosing Test".
Note: The injector tip must be cleaned with de-ionized water after the accuracy test. Failure to do so may cause crystallization around the injector tip during the next driving cycle
This test verifies that the DEF purging process is working correctly by purging the DEF pump and lines.
This service test is used to purge the DEF system. This test turns on the DEF purging pump, causing the DEF to be pumped from the injector back into the tank. Purging allows the system to de-pressurize and empty prior to repair work.
DEF Dosing System Verification Test
This test primes the dosing system. The test is used to ensure that the DEF pump is able to build and hold adequate pressure. The test will also check that there are no leaks across the DEF dosing system.
This test turns on the DEF pump. During this time, the DEF pump will pressurize the entire DEF dosing system. The DEF pump will purge the system at the end of the test.
After this test has been run, allow the DEF pump pressure to drop to a safe level. The DEF dosing system can then be inspected for signs of leakage.
In the electronic service tool, go to the following menu options:
Select the "Service" tab.
Select the "Calibrations" option.
Calibrations Listed in the Engine ECM Menu
Whenever an injector is replaced, the injector must be trimmed. Trimming the injector calibrates all the injectors to deliver the same amount of fuel. The Injector Codes Calibration allows the injector trim code information to be programmed into the ECM. After the injector is calibrated, the calibration data is checked for validity.
When new injectors are installed, record the serial numbers of each injector and input using the electronic service tool. Refer to Troubleshooting, "Injector Code - Calibrate" for more information.
In the electronic service tool, go to the following menu options:
Select the "Service" tab.
Select the "Service Procedures" option
Service Procedures Listed in the ECM Menu
Aftertreatment Sulfation Recovery Procedure - Part 1
Note: Electronic service tool version 2017B or later is required to perform this procedure.
Note: Use the electronic service tool to disable "Engine Idle Shutdown" and/or "User Defined Shutdown", if enabled, before performing this procedure. This action prevents the engine from shutting down immediately after the procedure has completed and allows a sufficient cool-down period.
The "Aftertreatment Sulfation Recovery Procedure - Part 1" is designed to clear sulfate deposits that have built up in the Selective Catalytic Reduction (SCR) aftertreatment. Part 2 of the procedure is used to clear the diagnostic code and remove the warning lamp. Part 1 of the procedure must be performed before part 2.
When safety interlocks are in place, the procedure works by taking control of the engine. A sequence of tests is performed to elevate exhaust temperatures and ensure that optimal conditions are met to reduce sulfate levels. Once sulfate levels are reduced to the required level, the procedure will complete.
Note: After the procedure has completed, allow a sufficient cool-down period at low idle before stopping the engine. Refer to Operation and Maintenance Manual, Stopping the Engine for more information.
In the electronic service tool, go to the "Service" menu.
Oxidation Catalyst Replacement Reset
Use this reset when the Diesel Oxidation Catalyst (DOC) is replaced.
When the reset is complete, turn the keyswitch to the "OFF" position. Wait for 2 minutes or until the "Wait to Disconnect" indicator (if installed) switches off. Turn the keyswitch to the ON position.
Use this reset when the Exhaust Gas Recirculation (EGR) valve is replaced.
Perform the following steps to replace the EGR valve:
- Replace the EGR valve. Refer to Disassembly and Assembly, Exhaust Gas Recirculation Valve - Remove and Install.
- Turn the keyswitch to the ON position.
- Connect to the electronic service tool.
- Navigate to the "Service" menu.
- Select "EGR Valve Reset" and click "Reset".
- Wait for at least 1 minute.
- Start the engine. Operate the engine until the coolant temperature is greater than
60° C (140° F) . - Turn the keyswitch to the OFF position. Wait for at least 2 minutes.
- Turn the keyswitch to the ON position.
- Use the electronic service tool to clear all logged diagnostic codes and verify that the repair eliminates the fault.
Rail Pressure Valve Learn Reset
Use this reset when the fuel rail pressure valve is replaced. This reset will reset the counter in the ECM for the number of times that the pressure relief valve has opened.
When the reset is complete, turn the keyswitch to the OFF position. Wait for 2 minutes or until the "Wait to Disconnect" indicator (if installed) switches off . Turn the keyswitch to the ON position.
Rail Pressure Sensor Replacement Reset
Use this reset when the fuel rail pressure sensor is replaced.
When the reset is complete, turn the keyswitch to the OFF position. Wait for 2 minutes or until the "Wait to Disconnect" indicator (if installed) switches off . Turn the keyswitch to the ON position.
SCR Catalyst Replacement Reset
Use this reset when the SCR catalyst is replaced.
When the reset is complete, turn the keyswitch to the OFF position. Wait for 2 minutes or until the "Wait to Disconnect" indicator (if installed) switches off . Turn the keyswitch to the ON position.
Use this reset when either the engine out NOx sensor or the tailpipe out NOx sensor is replaced. Also use this reset if both NOx sensors are replaced.
When the reset is complete, turn the keyswitch to the OFF position. Wait for 2 minutes or until the "Wait to Disconnect" indicator (if installed) switches off . Turn the keyswitch to the ON position.
Use this reset when either the Exhaust Gas Recirculation (EGR) cooler is replaced.
When the reset is complete, turn the keyswitch to the OFF position. Wait for 2 minutes or until the "Wait to Disconnect" indicator (if installed) switches off . Turn the keyswitch to the ON position.
Engine Emissions Operator Inducement Safe Harbor Reset
When the configured low idle speed is imposed as a result of operator inducement, the engine can be restarted and run for a maximum of 30 minutes. Each time the engine is restarted a counter in the ECM will decrease by one. The counter begins at three. Once the counter reaches zero, the engine will only run at low idle.
The "Safe Harbor Reset" will reset the counter to three.
When the reset is complete, turn the keyswitch to the OFF position. Wait for 2 minutes or until the "Wait to Disconnect" indicator (if installed) switches off . Turn the keyswitch to the ON position.
Note: Only use this reset when the fault that caused the inducement has been repaired or if the engine needs to be started as part of the troubleshooting process.