Doosan 10/105CWJD, Electronic Service Manual

Page: 73 / 139

Book: 23227143 (8-24-2010) Rev C
Page 71
Circuit Description:
The WEDGE receives a battery ground input from the air filter restriction switch
(S16 and or S17) when the switch closes signaling that the filters are clogged.
The air filter restriction switch contacts are normally open. The contacts close
when the air filter restriction reaches 20 inches of water.
Component Location:
S16 and S17 air filter restriction switches are located behind the engine and
airend air filter housing.
Troubleshooting Steps If The Air Filter Switches Do Not Close
Action Result
Step 1:
Check all harness connections throughout air filter
restriction switch circuit.
Repair harness as needed
Step 2:
Disconnect the harness from S16 and S17 air filter
restriction switches. Using a multimeter, measure the
continuity from the brown WJDe on the harness at
each switch to battery negative.
Continuity should be shorted
between each brown WJDe
and battery negative.
If not, repair harness
Step 3:
Turn the ignition switch to the “ON” position.
Disconnect the harness from S16 and S17 air filter
restriction switches. Place a jumper across the
harness terminals at S16. Remove jumper at S16
and place across harness terminals at S17.
Air filter restriction diagnostic
light on panel should come on.
If not, replace WEDGE