Engine-driven pump (EDP) does not stop when YELLOW ENG 2 PUMP P/BSW is OFF

TASK 29-13-00-810-821-A
Engine-driven pump (EDP) does not stop when YELLOW ENG 2 PUMP P/BSW is OFF

1. Possible Causes

CONNECTOR [3030-GD--A]
PUMP VARIABLE DTS [3030GD]
P/BSW 3703GD
engine pump solenoid-valve
C/B-HYDRAULIC/Y HYD/PUMP ENG2/CTL [3701GD]
SDAC

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 29-13-00-710-002	Operational Test of the Yellow Hydraulic System
ASM 291301
AMM 29-13-51-000-011	Removal of the Solenoid-Valve of Engine Pump
AMM 29-13-51-000-802	Removal of the Solenoid-Valve of Engine Pump
AMM 29-13-51-400-011	Installation of the Solenoid-Valve of Engine Pump
AMM 29-13-51-400-802	Installation of the Solenoid-Valve of Engine Pump

3. Fault Confirmation
Subtask 29-13-00-710-072-A

A. Do the operational test of the Yellow hydraulic system AMM 29-13-00-710-002.
(1) If the hydraulic pressure during the test of the Yellow hydraulic system does not decrease to 0 psi (0.0 bar), go to Para. 4.A.

4. Fault Isolation
Subtask 29-13-00-810-077-A ** ON A/C NOT FOR ALL

A. If the test confirms the fault:
(1) Do a check of the EDP:
(a) Disconnect the electrical connector CONNECTOR [3030-GD--A] from the PUMP VARIABLE DTS [3030GD] .
(b) Make sure that the P/BSW 3703GD is released.
(c) On the electrical connector CONNECTOR [3030-GD--A] do a check for +28VDC at pin 3.
(d) Connect the electrical connector CONNECTOR [3030-GD--A] to the PUMP VARIABLE DTS [3030GD] .
(e) If there is +28VDC and the EDP P/N is 887673 or 3031863-001:
1 Replace the engine pump solenoid-valve AMM 29-13-51-000-802 and AMM 29-13-51-400-802.
2 Do the test given in Para. 3.
(f) If the fault continues:
1 Replace the PUMP VARIABLE DTS [3030GD] .
2 Do the test given in Para. 3.
(2) If the fault continues:
(a) Remove the P/BSW 3703GD.
(b) On the rack, do a check for +28VDC at pin AA/C3.
(c) Install the P/BSW 3703GD.
(d) If there is +28VDC:
1 Replace the P/BSW 3703GD.
2 Do the test given in Para. 3.
(3) If the fault continues:
(a) Do a check of the aircraft wiring between:

The PUMP VARIABLE DTS [3030GD] and the P/BSW 3703GD
The P/BSW 3703GD and the C/B-HYDRAULIC/Y HYD/PUMP ENG2/CTL [3701GD]
The PUMP VARIABLE DTS [3030GD] and the SDAC

ASM 291301.

Subtask 29-13-00-810-077-B ** ON A/C NOT FOR ALL

A. If the test confirms the fault:
(1) Do a check of the EDP:
(a) Disconnect the electrical connector CONNECTOR [3030-GD--A] from the PUMP VARIABLE DTS [3030GD] .
(b) Make sure that the P/BSW 3703GD is released.
(c) On the electrical connector CONNECTOR [3030-GD--A] do a check for +28VDC at pin 3.
(d) Connect the electrical connector CONNECTOR [3030-GD--A] to the PUMP VARIABLE DTS [3030GD] .
(e) If there is +28VDC and the EDP P/N is 887673 or 3031863-001:
1 Replace the engine pump solenoid-valve AMM 29-13-51-000-011 and AMM 29-13-51-400-011.
2 Do the test given in Para. 3.
(f) If the fault continues:
1 Replace the PUMP VARIABLE DTS [3030GD] .
2 Do the test given in Para. 3.
(2) If the fault continues:
(a) Remove the P/BSW 3703GD.
(b) On the rack, do a check for +28VDC at pin AA/C3.
(c) Install the P/BSW 3703GD.
(d) If there is +28VDC:
1 Replace the P/BSW 3703GD.
2 Do the test given in Para. 3.
(3) If the fault continues:
(a) Do a check of the aircraft wiring between:

The PUMP VARIABLE DTS [3030GD] and the P/BSW 3703GD
The P/BSW 3703GD and the C/B-HYDRAULIC/Y HYD/PUMP ENG2/CTL [3701GD]
The PUMP VARIABLE DTS [3030GD] and the SDAC

ASM 291301.

5. Close-up
Subtask 29-13-00-942-051-A

A. Put the aircraft back to its initial configuration.
(1) Make sure that the work area is clean and clear of tools and other items.

[Rev.8 from Aug 2018] 2026.04.04 04:29:27 UTC