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The Detroit GHG17 Engine Parked SCR Efficiency Test verifies the integrity of the Selective Catalytic Reduction (SCR) system from engine warm-up to NOx efficiency. This test helps identify SCR catalyst efficiency concerns and DEF concentration issues.
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Important Notes
Total test time: 60-85 minutes.
Ensure the engine is at operating temperature (coolant temperature at least 71°C or 160°F) for accurate results.
Perform a Parked Regeneration if the DPF light is on before starting the test.
Test Procedure
Access the SCR System Tab
In the Service Routines window, navigate to the SCR System tab.
Select “Perform Parked SCR Efficiency Test” from the drop-down menu.
Start the Test
Press the Start button.
A “Caution” dialog box will appear.
Safety Precautions
Ensure the transmission is in Park or Neutral and the parking brake is engaged.
Press “Yes” to continue or “No” to exit.
Activate the Test
Press and hold the DPF switch in the “ON” position for 5 seconds, then release it. The engine speed will increase, indicating that the routine has begun.
Monitor Test Progress
The test will run, and the current status will be displayed in the progress box.
Note: If the test is aborted, the progress field will display a description of where the test failed.
Test Outcome
The test is not classified as passed or failed. After the test finishes and after 1 hour of stabilization, the progress field may display “NOx concentrations not high enough”.
Troubleshooting
If the progress box displays “Routine not started” or “Routine stopped”, check the following:
High Idle Safety Conditions:
Ensure the parking brake, neutral switch, clutch status, vehicle speed, and engine idle conditions are set as required in the service documentation.
Component Error Codes:
Look for the error code “DEF pump and DEF metering valve error not active” in the SCR system and resolve it.
Ignition Cycle:
Perform an ignition cycle, ensure communications from all modules are disabled, then turn the ignition back on and start the routine.
Parked Regeneration:
If the above steps do not work, perform a Parked Regeneration before starting the routine.
If Fault 520372/16 – SCR Closed Loop at Maximum Limit is active (not “persistent”) and other specific codes are not active, perform the following:
Perform a Parked Regeneration and allow the system to idle for 30 minutes.
Turn the ignition off and on again before starting the service routine.
By following these steps, you can effectively perform a Parked SCR Efficiency Test on a Detroit GHG17 engine, ensuring the integrity and efficiency of the SCR system.
More repair cases for Detroit Diesel engines,please refer to:Detroit Diesel Engine Repair
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