REV A
September 2016 Section 5 • Diagnostics
Part No. 227123 GRC 5 - 5
DIAGNOSTICS
The procedure below illustrates typical steps for diagnosing and fixing faults of type "HXXX and PXXX".
Diagnostic Chart
1
2
3
Check the fault device for a short or open circuit.
Check short or open circuit of the harness or
connector between Ground Controls and faulted device.
Check GCON Electronic Control Module (ECM).
Replace faulty device.
Repair or replace harness and/or connector.
Replace ECM.
No Good
No Good
No Good
Good
Good
Wiring Diagram
The wiring diagram shown below illustrates how fault type "HXXX" or "PXXX" devices are typically wired.
The signal to these types of devices originates at the Ground Controls and terminates at system ground.
GCON
Electronic Control Module
(ECM)
DEVICE
Signal Wire
Return Wire
Signal Side
Return Side
In order to successfully troubleshoot "HXXX" or "PXXX" type faults, the entire faulted out circuit needs to
be investigated.
Troubleshooting "HXXX" and "PXXX" Faults
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