TM 10-3930-675-20-1 0040 00-7 BOOM LIFTING/LOWERING TROUBLESHOOTING - CONTINUED 0040 00 Table 4. Error Code 152 - Lift Cylinder Locking Valve, Component Failure Troubleshooting Procedures - Continued. MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Error Code 152 - Lift Cylinder Locking Valve, Component Failure - Continued 4.  Remove   engine   cover   and forward  junction  box  X167 cover. 5.  Ensure that ignition switch is in  OFF  position.  Disconnect electrical leads from junction box X167 pin 14 and pin 15. Check  wires  from  6001  and 6002 to junction box X167 for damage and continuity. Check     for     continuity     to chassis and continuity between black and gray wires. a. If   continuity   between   pins, repair  or  replace  connectors (WP 0111 00). b. If continuity (short) to chassis, repair  or  replace  connectors (WP 0111 00). c. Replace locking valve solenoids (6001 and 6002) if voltage  is  as  specified  (WP 0169 00). 6.  Connect wires at junction box X167. 7.  Disconnect  connector  X159 and check continuity between pin   1   and   pin   2   on   lower connector part. Check continuity between pin 1 and chassis and pin 2 and chassis. If continuity is present, repair or replace   cable   from   connector X159 to junction box X167 (WP 0111 00). 8.  Check    continuity    between ECU (790) connector 2 pin 10 and  connector  X159  pin  1. Check    continuity    between ECU (790) connector 2 pin 3 and connector X159 pin 2. a. If   continuity   between   pins, repair  or  replace  connectors (WP 0111 00). b. If continuity (short) to chassis, repair  or  replace  connectors (WP 0111 00). 9.  Enter    “DIAG    SERVO    11 (13)” menu and check voltage of BL.VALVE. Voltage should     be     20-25V     with joystick   activated   to   lower boom. If  voltage  is  not  as  specified, replace  ECU  (790)  (WP  0079 00).