TM 10-3930-675-24-1
HYDRAULIC PISTON PUMP CUT-OFF TROUBLESHOOTING
THIS WORK PACKAGE COVERS
Error Code 172 - Hydraulic Piston Pump Cut-Off, Open
or Short Circuit Failure
INITIAL SETUP
References
TM 10-3930-675-10
Current Supply (A34738.0200) (WP 0048 00-31)
ECS Electrical Servo (A34648.0200) (WP 0048 00-5)
NOTE
Refer to WP 0004 00 for additional troubleshooting guidance, information, and illustrations that
locate critical components.
Refer also to illustration at end of work package for component location.
Table 1. Error Code 172 - Hydraulic Piston Pump Cut-Off,
Open or Short Circuit Failure Troubleshooting Procedures.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Error Code 172 - Hydraulic Piston Pump Cut-Off, 1. Place ignition switch to ON but a. Start engine. The voltage
Open or Short Circuit Failure.
don't start engine. Access the
(24V) and (mA) values should
diagnostic menu "SERVO"
go away when the pumps
12(13). The PUMP OFF
engage.
"OUTPUT" value should have b. If values do not go away,
voltage (24V) and the
ensure the engine cold start
"INPUT" value should have
function is not activated (TM
(mA). (Slow cranking of the
10-3930-675-10).
engine is a sign the pumps are c. If values still do not go away,
TEST OR INSPECTION-
EXTRA FUNCT.
2(13)
engaged during engine start).
Replace ECU (790) (WP 0080
00).
CUT-OFF THE
0
HYDRAULIC PUMP