Tag: Doosan Trouble Repair

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 Diagnostic Tool

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

Here is the solution for you to solve Doosan DMS-5 diagnostic software FAD1006 fault code “Check Connection State to ECU” error message when you trying to connect machine.

Related Contents:

Doosan Data Monitoring System DMS-5

Doosan Diagnostic Tool

 

Solution:

There is no response from the ECU.

• Make sure the power is supplied to the ECU.( Driven state machine)
• Check the communication status. (Cable, Connector tightening status)
• Make sure you have the same notification also occurs in the instrument cluster.

– Make sure you have the same notification also  occurs in the gauge panel.

• Make sure that you selected in the ECU information of the ECU program with the same

model machine.

• Verify that the problem also perform other functions.
• If you have problems in performing other functions, please contact the administrator for the notification.

 

Here comes the instruction show how to do Doosan machine VBO calibration Joystick check.

 

Related Contents:

Doosan Diagnostic Tool

Doosan DMS-5 Data Monitor System

 

Procedures:

*Calibration judgement

1.1. Measure the input & output voltage of the joystick pressure sensor

1.1.1 Check if the output voltage is 1V when it is connected under unloaded condition.

1.1.2 Check if the output voltage of the pilot pressure sensor while the machine is in operation.

(Take the DMS-5 monitoring data during the test)

1.1.3 Check if the voltage value measured at the pressure sensor is matched with the pressure

indicated on the gauge panel.

1.1.4 Operate the machine and check if the pressure value indicated on the gauge panel is

changed according to changes in the pressure.

Ex. DX350LC-7 Pilot pressure sensor (Please refer the shop manual to check the exact value on each model)

* Operating voltage: 24 V ±10%, Output voltage: 1 ~ 5 V, Operating current: max. 20 mA,

Measuring pressure: 0 to 50 bar, Measurement tolerance: ±3%

*Formula for voltage-pressure conversion: Voltage = (0.08 x Pressure) + 1

1.2. Check the physical condition of the pressure sensor

1.2.1. Assembly condition

1.2.2. External damage

1.2.3. Short circuit

Ex. DX350LC-7, Boom up pressure sensor (PT-1)

1.3. Proceed with air bleeding on the pilot line

1.3.1. Minimum RPM required

1.3.2. Select the location closest to MCV for releasing the pilot line

Ex. DX350LC-7 Boom down (Please refer the shop manual to check the exact position on each model)

1.3.3. Pilot hose in a relation with calibration fail should be slightly open in order that it should

allow only air to escape and hydraulic pressure to escape to a minimum.

1.3.4. Prevent the contamination of the machine and floor by leaking oil