TM 10-3930-675-20-1 0012 00-6 ELECTRONIC CONTROL UNIT (ECU) INPUT VOLTAGE TROUBLESHOOTING - CONTINUED 0012 00 Table 3. Error Code 123 - 10V Reference Voltage for Servo ECU (790) Failure Troubleshooting Procedures - Continued. MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Error Code 123 - 10V Reference Voltage for Servo ECU (790) Failure - Continued b. If voltage is not as specified, check    continuity    between connector  X157  pin  2  and junction box X169 pin 2 and between connector X157 pin 3 and junction box X169 pin 3. a. If  continuity  is  not  present, repair  or  replace  connectors (WP 0111 00). b.If continuity is present, notify SRA. Table 4. Error Code 201 - Supply Voltage to Tophandler ECU (791) Failure Troubleshooting Procedures. MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Error    Code    201    -    Supply    Voltage    to Tophandler ECU (791) Failure 1. Ensure  that  emergency  stop switch is not activated. Release emergency stop switch (TM 10-3930-675-10) as required. 2. Remove  tophandler  junction box   cover   and   ensure   that circuit breaker 51-F41 is not tripped. Reset circuit breaker as required (WP 0076 00). 3. Remove  and  test  four  relays 3009-1, 3009-2, and 3009-3, and 315-1 (WP 0111 00). Replace  defective  relays  (WP 0076 00 and WP 0111 00). 4. Test automatic circuit breaker F40   at   tophandler   junction box (WP 0111 00). Replace     circuit     breaker     if shorted (WP 0076 00). 5. Disconnect ECU (791) connector 1 and check voltage at pin 1 and pin 15. If   voltage   is   present,   replace ECU (791) (WP 0076 00). 6. Check voltage at relay 3009- 2 pin 87. If voltage is present, notify SRA. 7. Check voltage at relay 3009- 1 pin 87. If voltage is present, notify SRA to replace wire (A51E). 8. Check    voltage    at    circuit breaker 51-F41. If voltage is present, notify SRA to replace wire (A51B). 9. Check voltage at relay 315-1 in 87. If voltage is present, notify SRA to replace wire (A51J). DIAG TOP LIFT 1(16) SYSTEM POWER  24.00V POWER RI CAN   24.00V POWER LE CAN   24.00V 10 V REF OUT   10.00V