APPARENT HYDRAULIC DIAGNOSTIC CENTER (HDC) SYSTEM PROBLEM - Continued
Disconnect umbilical cable connector W4P5 or W4P6 (as applicable) associated with "CIRCUIT FAULT"
pressure transducer from cable assembly W2J1 or cable assembly W3J1 (as applicable) connector on
umbilical disconnect bracket (Figures 30 and 31).
Pin Locations for W2J1 and W3J1 Connectors.
Upper Cable Assembly W2 and Lower Cable Assembly W3 Electrical Connections.
Perform continuity test and check for short circuit to cable ground (connector case/shell) for two pins/
wires in embedded cables assembly (W2J1 or W3J1, as applicable) that route 15 VDC reference voltage
from HDC control box to pressure transducer associated with "CIRCUIT FAULT" message. (15 VDC
reference voltage is applied between pins 1 and 2 on 5-pin hydraulic pressure transducer electrical
connector J1 on all pressure transducers. The DC voltage representing hydraulic pressure measured by
pressure transducer is returned to HDC control box between pins 4 and 5 on transducer electrical
Refer to FP-19 Hydraulic Pressure Transducer Electrical Wiring Diagram.