Doosan Bobcat Machine Electric Fault Troubleshooting Guide Tip

This instruction show you guide on how to solve Doosan and Bobcat Electric problems can be caused by many causes. Therefore, it is not possible to list all the causes however, it is usually necessary to check the following items.

 

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1 Check the battery

1. Check terminal tightening.
2. Check absence of oxidation
3. Check absence of consumers

– Check if there is any device that is not supplied by the engine or machine company capable of generating dark current installed.

1. Check battery capacity
2. Check battery external damage

 

2 Check part’s connection (ECU, VCU, sensor etc.)

1. A.Check pin condition (bending, broken, breakaway)
2. Check terminal condition (widening, broken, breakaway)
3. Check absence of oxidation
4. Check absence of contains water
5. Check external damage
6. Check looseness of assembly connection

– Except some specific sensors(CAM, Crank, etc…), ECU can diagnosis the open circuit at Key on condition. Check if the open circuit fault is occurred due to contact failure when the wiring harness is wiggled by hands.

1. check cross-connect with another sensor

 

3 Check sensor resistance

1. Resistance type sensor only (for example temperature sensor)
2. Remove sensor connector and check sensor itself resistance refer each resistance information

 

4 Check wire harness

1. Check pin to pin. (sensor connector to ECU connector)
2. Check damage of wire. (broken, cut)

 

5 Check Network

1. Check the service tool connect ability
2. Resistance of CAN high and CAN low (CAN line has 120ohm resistors at both ends)
3. Check voltage by 2 channel oscilloscope CAN High and CAN low signal are balanced when one is up, the other is down.

– CAN High signal is 2.5~3.5V and CAN Low signal is 1.5~2.5V

* For the CAN pin number, refer to the Diagnostic connector.

6 Check CAM CRANK (Oscilloscope)

1. Preparing oscilloscope and Insulation piercing clip

1. Oscilloscope setting
2. Sampling interval: 2MHz, input signal voltage +/- 30V
3. Channel : at least 2 channel (CAM and CRANK)
4. Oscilloscope and Probe (example)

1. Check the CAM and CRANK sensor location and Pin information

1. Installation step
2. Remove the connection cover
3. Install the piercing clip (CAM and CRANK)

iii. Connect probe each clip

1. Measuring step
2. Measuring CAM and CRANK signal at same time

Example)

1. Inspection the signal (focus at CRANK signal tooth depend on CAM rising edge and falling edge), DM01/DM02 (117deg) / DM03(126deg)

 

More topics for Doosan,please refer to:Doosan Trouble Repair