Procedure For Testing And Troubleshooting - Komatsu PC88MR-10 Shop Manual

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Procedure for testing and troubleshooting

The air conditioner is provided with self-diagnosis functionality in order to provide for inspection of its main

components. Specifically, the operation of sensors and servomotors can be examined.

If a troubled section is detected, every part of that section must be inspected.

1. After basic check, find the troubled section according to the detected trouble of the air conditioner.

2. Narrow down the sections with the self-diagnosis function (See Check with self-diagnosis ).

If, however, the entire air conditioner unit fails to operate, inspect for problems with the supply of power to

the air conditioner controller and with CAN communication between the machine monitor and the air

conditioner controller.

If any part of the air conditioner unit can operate, it will indicate that the air conditioner controller is

receiving power normally and that CAN communication between the machine monitor and the air

conditioner controller is normal.

3. After finding out the troubled section, inspect the component parts in that section and repair the troubled

Basic testing and troubleshooting sequence

*1: By error display or abnormal display on "Electrical Systems" screen on the machine monitor.

*2: Simple checking of refrigerant volume through sight glass.

Start up the engine, set the air conditioner switch to ON, and then wait for five minutes before proceeding with

the inspection.

A) If the continuous stream of bubbles can be seen, the system contains insufficient refrigerant.

B) If the bubbles can be seen intermittently, the refrigerant volume is sufficient.

(ALL-K500-422-K-00-A)

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