Train doors were not proven closed. TC opened and closed train doors a few times to no avail. Openedand closed both side cab doors to no avail. Train was disem bark and withdrawn to UPD. ~~~~~ L3 531/532 From ER, TC open closed x6 times, unable to clear fault (DIR unable to extinguish). #
#3531 occupied & DIRBS operated for train to withdraw in ATPM.
- #3531 occupied: DIR lit, DMI indications OK.
Open/ close train doors - TIMS showed all doors proven closed, no DMI indication but DIR remains lit.
- #3532 occupied: no DIR lit.
Open/ close train doors,DIR extinguished with no DMI indication.
- Un-coupled 531/532: #3532 no DIR lit. #3531 with DIR lit.
- DIR able to extinguish when #3531 ADBS was pressed.

A. SDIR Relay base faulty.
Likely
Found #3531 SDIR relay base in NG condition.
Contacts in NG condition will cause poor connectivity in the circuitry path.
Wires 2841 and 2842 are connected to these contacts.
These two wires are the path that energize the DIR.

B. Train wiring faulty
Unlikely
Continuity and resistance check on wires 2841 and 2842 – SATIS.
Continuity and resistance check on wires 2824, 2812, 2837, 2839 at junction box – SATIS.

C. Faulty Relays
Unlikely
Measured both cabs DIR 1/2/3, COR6 and DLR coils and contacts – Satis.
Measured SDIR coil – resistance slightly high at ~5K ohms. (normal: 4K ohms)

D. Internal Obstruction
Unlikely
No door rubbing marks observed.
Weather strips are secured and in good condition.

E. External Obstruction
Unlikely
No FOD was found along guide rails & J-rails.

F. Door close sensing switch rigging
Unlikely
Conducted 10/20mm gauge, passed.
#3531 saloon door sensing switches, detrainment ramp switches checked OK.

G. Door manifold/actuator faulty
Unlikely
#3531 doors no air leakages from actuators and manifold in open/closed position.
Air was exhausted as required during opening/closing action.
No residual voltage at EMV.

H. Door locking mechanism faulty
Unlikely
#3531 doors were able to be locked and secure when closed.

Rectification details
- C/O 3531 SDIR relay base.
- Preventively change out 3531 SDIR Relay
- 10/20mm done for all saloon doors - OK
- Saloon door speed - OK
- DIR/DMI/TIMS - OK
- Cab door tug test - OK, no intermittent DIR.
- Detrainment door - OK

 Alan/Anand/Kamarul
25/07/2024