04/09/21
Message Overview:
Message Description:
Proximity Sensor Electronic Unit (PSEU) detects an internal SHORT in the Proximity Sensor PX18 Passenger Door Closed or in the wiring to the Proximity Sensor is shorted to the aircraft.
Possible Causes:
- Proximity Sensor Electronic Unit (PSEU) (A9)
- Passenger Door Handle Locked Proximity Sensor (PX18)
- 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 |
| Operational Test of the Door Sensors | AMM 52-71-00-710-801 |
| 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 SP130 from PX18. Verify the wiring from the PX18 SP130 PIN A2 to ground and from PX18 SP131 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 PX18 per the installation procedure, and then check the sensor out.
- If the fault is still there replace the PSEU.
- Functional check the proximity sensor electronic unit.
- Do close out.
