Wacker Neuson GP 3800A, Repair Manual

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Troubleshooting GP Repair
wc_tx000548gb.fm
104
6.24 Checking Auto Idle Circuitry Between Fuse and Auto Idle Unit
See Graphic: wc_gr003132
Electric shock hazard. Only qualified personnel should conduct this
test.
Voltage may be prevented from reaching the idle solenoid by a faulty
auto idle switch or by a faulty auto idle unit. To check the circuit, carry
out the following procedure:
6.24.1 Stop the generator.
6.24.2 Remove the screws which secure the control panel to the generator.
Locate the auto idle switch
(a)
.
6.24.3 Check the continuity of the auto idle switch.
• If the switch lacks continuity, replace it.
• If the switch has continuity, it should be functioning.
6.24.4 Remove the plug from the back of the auto idle unit
(b)
.
6.24.5 Start the generator.
6.24.6 Check the voltage between the red and black wires of the plug. There
should be 20±2V. At this point in the troubleshooting, you should have
measured voltage at the fuse but not at the idle solenoid, and the auto
idle switch should have checked OK. Therefore:
•
If voltage is measured to the auto idle unit but not at the idle sole-
noid, the auto idle unit is malfunctioning, replace it.
• If no voltage is measured at the auto idle unit, check the wiring
between the fuse and the auto idle unit. Repair or replace the wir-
ing as needed.
WARNING
wc_gr003132
1000
200
20
2
200m
F
V
A
V- COM
V
a
b
b