Doosan 10/370, Operation And Maintenance Manual

Page: 73 / 96

Troubleshooting Operating & Maintenance Manual
73
C. Double Check Before Disassembly
The source of most compressor troubles can be traced not to one component alone, but to the
relationship of one component with another. Too often, a compressor can be partially
disassembled in search of the cause of a certain trouble and all evidence is destroyed during
disassembly. Check again to be sure an easy solution to the problem has not been
overlooked.
D. Find and Correct Basic Cause
After a mechanical failure has been corrected, be sure to locate and correct the cause of the
trouble so the same failure will not be repeated. A complaint of “premature breakdown” may
be corrected by repairing any improper wiring connections, but something caused the
defective wiring. The cause may be excessive vibration.
General Information
The WEDGE controller records and displays diagnostic fault codes for the compressor system
and the electronic engine. These codes are displayed on the 4-digit LED display on the
machine control panel. Two of the ten LED diagnostic lamps on the control panel are used with
fault codes display. One lamp is designated “Engine Fault” and the other “Compressor Fault”.
When the engine fault lamp is on, all codes displayed are engine faults. When the compressor
fault lamp is on, all codes displayed are compressor or package related faults.
A list of compressor and engine faults is attached with the placards inside the machine control
panel and provided in this section. The table of Alert/Shutdown conditions in this section also
lists the compressor fault codes and a list of the engine fault codes is provided.
The engine diagnostic fault codes can also be read with the manufacturer's service tool. A
service tool connector is mounted on the engine. This connector provides a connection to the
J1939 CAN network. For advanced engine troubleshooting, it is recommended that the
manufacturer's service tools be used with accompanying service literature.
Fault Code Description (QSX15 Engine Fault Codes)
111 Engine Control Module - Critical Internal Failure
115
Engine Speed/Position Sensor Circuit - Lost both signals from Magnetic Pickup
Sensor
121
Engine Speed/Position Sensor Circuit - Lost one or two signals from Magnetic
PU Sensor
122 lntake Manifold Pressure Sensor #1 Circuit - Shorted High
123 lntake Manifold Pressure Sensor #1 - Circuit - Shorted Low
135 Engine Oil Pressure Sensor Circuit - Shorted High
141 Engine Oil Pressure Sensor Circuit - Shorted Low