04/09/21
Message Overview:
Message Description:
Proximity Sensor Electronic Unit (PSEU) detects an internal SHORT circuit in the Proximity Sensor PX15 Passenger Door Closed or the wiring to the Proximity Sensor is shorted to the aircraft.
Possible Causes:
- Proximity Sensor Electronic Unit (PSEU) (A9)
- Passenger Door Closed Proximity Sensor (PX15)
- Associated Wiring
Troubleshooting Tips:
Advisory Wire/Service Bulletin: None
Forum Articles/Infoservice/Newsletter: None
Quick Links:
| Removal of the Proximity-Sensor Electronic Unit (PSEU) | AMM 32-61-09-000-801 |
| Installation of the Proximity-Sensor Electronic Unit (PSEU) | AMM 32-61-09-400-801 |
| Functional Test of the Proximity-Sensor Electronic Unit (PSEU) | AMM 32-61-09-720-801 |
| Built-In Test of the Door Proximity-Sensors | AMM 52-71-00-740-801 |
| Removal of the Passenger-Door Closed Proximity-Sensor | AMM 52-71-01-000-801 |
| Installation of the Passenger-Door Closed Proximity-Sensor | AMM 52-71-01-400-801 |
| Wiring - Maintenance Practices - ALL | SPM 20-12-00-02 |
| Wire Repair - Maintenance Practices - ALL | SPM 20-12-10-02 |
Troubleshooting Recommendations:
- Pull and reset the PSEU gear system breakers (CB1-C13, CB1-C14, CB2-C13, CB2-C14), recheck the system for the fault.
- Remove the PSEU from its rack and disconnect the connector PX15P1. Verify the wiring from the PX15J1 to ground and from PX15J1 PIN B2 to ground. The wires should be open to ground.
- If the wiring checks good, download and have field service review the PSEU NVM. Further troubleshooting will depend on results of the PSEU NVM.
- If the fault is still there replace PX15 per the installation procedure.
- If the fault is still there replace the PSEU.
- Perform the functional check of PSEU.
- Do close out.
