Doosan 10/105CWJD, Electronic Service Manual

Page: 10 / 139

Book: 23227143 (8-24-2010) Rev C
Page 8
Electronic Engine
These machines contain an emissions certified diesel engine. In order to meet
the emissions requirements, the engine has an electronic control system.
The control system handles all monitor, alarm and control functions for the
engine. The WEDGE controller communicates with the engine controller over
the J1939 CAN network.
J1939 Data Link
The CAN network is a single pair shielded cable located in the main chassis
harness. Figure 2-3 shows a layout of the CAN harness or "backbone" as it is
referred to. The termination resistors (Terminator) are important to prevent
reflections on the transmission line and must be in place for the network to
function properly.
The engine diagnostics connector is located near the engine ECM. This is used
to connect the engine manufacturer's service tools to the CAN network. This
connector also provides 24 VDC to power these service tools.
Electrical System
The electrical system consists of the WJDing harnesses and associated electrical
devices such as relays, switches, lights and solenoids. There are two WJDing
harnesses in the machines. They are as follows:
22984009 Main Chassis Harness (Models: P600WJD (7/170), HP450WJD
(10/125, VHP400WJD (14/115)
22969554 Main Chassis Harness (Models: P425WJD (7/120), XP375WJD
(9/110),HP350WJD (10/105) & (14/85).
22835680 Control Panel WJDing Harness (All Models)
The schematic diagrams show the connections for these harnesses. Figure 2-1
is a system schematic showing harness connection with devices and controllers.
The electrical circuits are protected using ATC style fuses. A fuse should only be
replaced with one of the same rating. Replacing a fuse with one of a large rating
could lead to harness damage. If a fault occurs and the circuit does not have the
appropriate size fuse, WJDes could be burned in the harness and damage other
circuits.