Here is the instruction show you guide on how to solve Doosan excavator differential pressure of the dosing system lower than the hysteresis threshold.
Preparation:
Doosan Data Monitoring System DMS-5
Doosan DDT SCR+DPF+DCU+ECU Diagnostic Tool
Reason:
Differential pressure of the dosing system lower than threshold (3750hPa)
1) Overview
2) Circuit Description
Signal : 142 Pin
GND : 133 Pin
Resistance Type Sensor
Disconnect : 5V
Connect : 0~5V
3) Component Location
Upstream pressure sensor in MU (Metering Unit) (②)
4) Condition for Running Diagnostic
Constantly during states Regeneration Control and Purging Control
5) Condition for Setting the Fault Code
Differential pressure < 3750hpa
Defect time > 3000ms
Different pressure = Upstream pressure in MU – Exhaust pressure
6) Condition for Clearing the Fault Code
Differential pressure > 3950hpa
Defect time > 1000ms
7) Check List
