TM 10-3930-675-20-1 0010 00-2 OVERLOAD PROTECTION TROUBLESHOOTING - CONTINUED 0010 00 Table 2. Error Code 131 - Boom Extension Sensor or Circuit Failure Troubleshooting Procedures. MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Error  Code  131  -  Boom  Extension  Sensor  or Circuit Failure 1.  Remove cover at rear of boom and  inspect  boom  extension sensor   and   steel   wire   for damage.   Ensure    that    steel wire   easily   pulls   out   and retracts. 2.  Remove cover from junction box  X169,  located  on  right side    of    boom    and    check voltage between pin 2 and pin 3. Voltage should be 10V. If  voltage  is  present,  check voltage between junction box X169 pin 1 and pin 3. Voltage should be 0.3-9.5V depending    on    position    of boom. If voltage is not present, replace boom    extension    sensor    (WP 0099 00). 3.  Remove   ECU   (790)   cover from operator’s seat base and slide ECU mounting tray out (WP 0079 00). 4.  Check ECU (790) connector 1  and  ECU  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. 5.  Perform voltage check between connector X157 pin 2 and pin 3. Voltage should be 10V. a. If voltage is present, check continuity between connector  X157  pin  2  and junction  box  X169  pin  2, between   connector   X157 pin   3   and   junction   box X169  pin  3,  and  between connector  X157  pin  1  and junction box X169 pin 1. If    continuity   is    not    present, repair or replace connectors (WP 0111 00). DIAG SERVO 1(13) SYSTEM POWER 24.00V POWER RI CAN 24.00V POWER LE CAN 24.00V 10V REF OUT 10.00V