| Event Code | ||
|---|---|---|
| Code and Description | Conditions which Generate this Code | System Response |
| E1969 (1)
High Aftertreatment #1 SCR Dosing Atomization Air Assist Pressure |
The air pressure is above the trip point for the programmed delay time. | The code is logged.
Dosing is disabled until the pressure is correct. |
Note: Use Cat ET to verify any suspected code. Determine what codes are present. Evaluate all codes for possible interaction. Refer to Troubleshooting, "Event Codes" for information about event codes.
- Pressure regulator for air assist pressure has failed
- Plugged DEF injector nozzle
- Air assist pressure sensor malfunction
Pressure Regulator for Air Assist Pressure
Note: The air pressure regulator is set at the factory and must not be adjusted. Attempting to adjust the regulator will destroy the regulator. The only service option is to replace the regulator.
Monitor the status for "Aftertreatment #1 SCR Dosing Air Assist Absolute Pressure" on Cat ET.
Activate the "Aftertreatment #1 SCR Dosing Air Assist Valve Command Override" and record the pressure. The pressure must be in the range of
Replace the regulator if the pressure is out of range.
Air Assist Pressure Sensor Malfunction
Determine if the air assist pressure sensor is reading correctly. Install a gauge on the air outlet of the cabinet and compare the indicated pressures.
Check the nozzle for an obstruction.
Reference: Refer to Testing and Adjusting, "Dosing Lines Blockage - Test".