TM 10-3930-675-20-1 0040 00-6 BOOM LIFTING/LOWERING TROUBLESHOOTING - CONTINUED 0040 00 Table 3. Error Code 151 - Lift Cylinder Locking Valve, Wiring Circuit Failure Troubleshooting Procedures - Continued. MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Error Code 151 - Lift Cylinder Locking Valve, Wiring Circuit Failure - Continued 10.Enter   “DIAG   SERVO   11 (13)”  menu  and  check  BL. VALVE     voltage.     Voltage should     be     20-25V     with joystick   activated   to   lower boom. If  voltage  is  not  as  specified, replace  ECU  (790)  (WP  0079 00). Table 4. Error Code 152 - Lift Cylinder Locking Valve, Component Failure Troubleshooting Procedures. MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Error Code 152 - Lift Cylinder Locking Valve, Component Failure 1.  Remove   ECU   (790)   cover from operator’s seat base and slide ECU mounting tray out (WP 0079 00). 2.  Check ECU (790) connector 2 and tray grounding leads for proper connection. a. Connect any loose or disconnected connections. Push  ECU  mounting  tray  in and install cover. b. Repair or replace any damaged     connectors     (WP 0111 00). Push ECU mounting tray in and install cover. 3.  Disconnect   electrical   leads 6001 from right lift cylinder locking   valve   solenoid   and perform voltage check. Voltage  should  be  0V  with joystick   in   neutral   position and   20-25V   with   joystick activated to lower boom. If voltage is as specified, replace lift     cylinder     locking     valve solenoid (WP 0169 00). DIAG SERVO 11(13)         OUTPUT/INPUT FAN        0mA    0mA BL.VALVE 0.00V    0mA