Service and Repair Manual
November 2016
Fault Codes
100
GS-2669 DC • GS-3369 DC • GS-4069 DC
Part No. 1272220GT
Faul t I ns pec tion Proc edur e
Fault Inspection Procedure
1
Check the device associated with the faulted circuit
1
Disconnect the faulted device connector.
2
Using a multi-meter, measure resistance between the two
terminals of the faulted device.
3
Resistance should be as follows.
Device
Typical Resistance
Solenoid Valve, Drive
27.2
Ω
Solenoid Valve, Steer
19
Ω
Solenoid Valve, Platform Up
25
Ω
Solenoid Valve, Platform Down
6.25
Ω
GCON and PCON Alarm
>1M
Ω
Automotive Horn
1.0
Ω
Contactor Coil
47
Ω
OK
Go to step 2
No Good
Replace faulted device
2
Check the harness between the ground controls and the faulted device
1
Disconnect the GCON ECM connectors, C1, C2 and C3.
(or C4 if equipped with outriggers).
2
Disconnect the faulted device connector.
3
Check the continuity between the GCON ECM connector
and the signal side of the faulted device.
Result: Resistance should be close to 0
Ω.
4
Check the continuity between the return side of faulted
device and system ground.
Result: Resistance should be close to 0
Ω.
5
Check resistance between return side and signal side of
the harness plug of faulted device.
Result: Resistance should be 1M
Ω
or higher.
OK
Go to step 3
No Good
Replace or repair harness
3
Check the GCON ECM