06/25/19
Message Overview:
Fault Message:
GCU2 PIN PROGRAMMING FAULT
Fault Code:
2422128LPS
Associated CAS:
| Reporting LRU: | Generator Control Unit (GCU) 2 |
| System Description: | 24-21-00 |
| Schematic Diagram: | 24-21-00 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Wiring Diagram: | 24-21-02 [ Global Express ] [ G5000 ] [ Global XRS ] |
Fault Description:
Generator Control Unit (GCU) 2, during initial power up (cold start), has detected a fault in the pin programming wiring or in the pin programming sensing circuit, consequently the Generator will not come on-line.
Possible Causes:
- Generator Control Unit (GCU) 2 (A57)
- Associated Wiring
Troubleshooting Tips:
Advisory Wire/Service Bulletin: None
Forum Articles/Infoservice/Newsletter: None
A GCU patch cable (GSE REF # 24X-24-02) can be used to swap GCUs 1, 4 and 5 into position 2 or 3 (for troubleshooting only).
The GCU NVMs can only be downloaded at position #2 or #3.
Quick Links:
| Removal of the Generator Control Units (GCU) | AMM 24-24-01-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of the Generator Control Units (GCU) | AMM 24-24-01-400-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Wire Repair - Maintenance Practices - ALL | SPM 20-12-10-02 [ Global Express ] [ G5000 ] [ Global XRS ] |
Troubleshooting Recommendations:
- Swap GCU 2 with GCU 3 (physically or using the GCU patch cable).
NOTE: Use PMAT to monitor the fault on GCU.- If system checks are good, replace GCU 2 and do close out.
- If fault remains, continue with next step.
- Disconnect connector A57P2 and perform wiring checks on GCU 2 as follow:
From To Expected Result Result A57P2-18 A57P2-34 open A57P2-17 A57P2-35 open A57P2-26 A57P2-44 open A57P2-27 A57P2-43 short - If the wiring checks are not good, repair defective wiring as required and do close out.
- If the wiring checks are good, do close out.
- Do close out.