Troubleshooting "Hxxx" And "Pxxx" Faults - Genie GR-12 Service Manual

May 2018

Troubleshooting "HXXX" and "PXXX" Faults

The procedure below illustrates typical steps for diagnosing and fixing faults of type "HXXX" and "PXXX".
Diagnostic Chart
1 Check the faulted device for a short or open circuit.
Check short or open circuit of the harness or
2
connector between Ground Controls and faulted device.
3 Check GCON Electronic Control Module (ECM).
Wiring Diagram
The wiring diagram shown below illustrates how fault type "HXXX" and "PXXX" devices are typically wired.
The signal of these types of devices originates at the Ground Controls and terminates at system ground.
GCON
Electronic Control Module
(ECM)
In order to successfully troubleshoot "HXXX" or "PXXX" type faults, the entire faulted out circuit must be
investigated.
Part No. 1275811GT
Good 
Good 
Signal Wire
GR ™ • QS
No
Good
Replace faulted device.

No
Good
Repair or replace harness an/or connector.

No
Good
Replace ECM.

Signal Side Device
™ R • QS ™ W
Service Manual
Diagnostics
Return Side Return Wire
101