Fault code 1885 is aftertreatment 1 Intake NOx Sensor Circuit - Voltage below normal
Cummins fault code 1885 indicates an issue with the aftertreatment 1 intake NOx sensor circuit, specifically that the voltage is below normal. Here are some steps to troubleshoot this issue:
1. Inspect the sensor and wiring: Start by checking the condition of the NOx sensor and its wiring harness. Look for any visible damage such as loose connections, frayed wires, or corrosion. Repair or replace any damaged components.
2. Test the sensor: Use a multimeter or a diagnostic tool to test the voltage output of the NOx sensor. Compare the readings to the specifications provided by Cummins. If the sensor is not producing the expected voltage, it may be faulty and needs to be replaced.
3. Check for exhaust leaks: Exhaust leaks can affect the readings of the NOx sensor. Inspect the exhaust system for any leaks or leaks in the area where the sensor is located. Repair any leaks found to ensure accurate readings.
4. Verify exhaust gas temperatures: Low exhaust gas temperatures can cause the NOx sensor voltage to be below normal. Check the exhaust gas temperatures using a diagnostic tool and compare them to the manufacturer's specifications. If the temperatures are too low, it may indicate a problem with the engine or aftertreatment system.
5. Clear the fault code: After addressing the potential issues, clear the fault code from the ECM using a diagnostic tool. Monitor the engine operation to see if the fault code returns. If it does, further diagnostics or assistance from a Cummins technician may be necessary.
It's important to note that these troubleshooting steps are general guidelines. For a more accurate diagnosis and detailed information, it is recommended to consult the Cummins service manual or contact a certified Cummins technician or dealer.