Service Manual
February 2022
Diagnostics
82
GRC
™
Part No. 1314708GT
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, J1/QD31,
J2/QD33 and J3/QD32.
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
Summary of Contents for Genie GRC-12
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Page 115: ...February 2022 Service Manual 103 Electrical Schematic GRC from GRC11 1000 to GRC11 1078...
Page 118: ...Service Manual February 2022 106 Electrical Schematic GRC from GRC11 1000 to GRC11 1078...
Page 119: ...February 2022 Service Manual 107 Electrical Schematic GRC from GRC11 1079 to GRC14 1780...
Page 122: ...Service Manual February 2022 110 Electrical Schematic GRC from GRC11 1079 to GRC14 1780...
Page 123: ...February 2022 Service Manual 111 Electrical Schematic GRC from GRC14 1781 to GRC15 2343...
Page 126: ...Service Manual February 2022 114 Electrical Schematic GRC from GRC15 2344 to GRC16P 2481...
Page 127: ...February 2022 Service Manual 115 Electrical Schematic GRC from GRC16P 2482 to GRC16P 2562...
Page 130: ...Service Manual February 2022 118 Electrical Schematic GRC from GRC16P 2563 to GRCP 5999...
Page 131: ...February 2022 Service Manual 119 Hydraulic Schematic GRC from GRC11 1000 to GRC12 1168...
Page 135: ......