EB applied departing station with obstruction motion. TC reset EB -ok. Train unable to reach target speed. TC switched to ATPM still unable to reach target spee d. STBS operated and train disembark at LVR. ~~~~~ "1. Fault confirmed/Fault cannot duplicate
Fault duplicated in depot.

2. What was found from ER/Fault record?
- 1515 BCP at approx 0.3 bar at  when no braking command was given. Brakes were released for all other cars.
- TIMS show FC314 BCU Control Pressure fault.

3. Troubleshooting details
Observations in depot
During Brakes cyclic test, when B1 to Coast, 1515 BCP stuck  at 0.3bar.

Probable Causal Factor: These are 3 identified causal factors based on FTA:
1. ACU unable to execute required BCP -likely
- ER symptoms and fault codes point towards ACU failure.
- Found AF (application selonoid v/V -OL

2. BCU unable to control ACU solenoid valves -unlikely
- 1515 BCP respond when brakes were commanded, suggesting that BCU was able to monitor and regulate the BCP.

3. Defective wiring between BCU and ACU- unlikely
- Wiring checks ""satis"". ACU solenoid valves able to energise and deenergise as commanded

4. Rectification details
-. Replaced  1515 ACU, faulty ACU will be sent to RSW for further investigation.
- Brake cyclic test carried out and brake pressure all within criteria.
- No fault code on TIMS."

N.A/KUMAR/ALI /10.04.23.