TM 10-3930-675-20-10012 00-2ELECTRONIC CONTROL UNIT (ECU) INPUT VOLTAGE TROUBLESHOOTING - CONTINUED0012 00Table 1. Error Code 121 - Supply Voltage to Servo ECU (790) FailureTroubleshooting Procedures - Continued.MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTIONError Code 121 - Supply Voltage to Servo ECU(790) Failure - Continued6. Check for voltage atconnector X154 pin 4.If voltage is present, notify SRA.7. Check for voltage atemergency stop switch pin 2(wire 1544).If voltage is present, notify SRAto replace wire (1544).8. Check for voltage atconnector X154 pin 1.If voltage is present, notify SRAto replace wire (1541).9. Check for voltage atconnector X150 pin 1.If voltage is present, notify SRAto replace wire (1501).10.Check for voltage atconnector X30 pin 1.If voltage is present, notify SRAto replace wire (301).11.Check for voltage at circuitbreaker F30.If voltage is present, notify SRAto replace wire (A301).12.Check for voltage at relay315 pin 87.If voltage is present, notify SRAto replace wire (A808A).13.Check for voltage atconnector X80 pin 3.If voltage is present, notify SRAto replace wire (A804).14.Check for voltage atautomatic circuit breakerF50-2.If voltage is present, notify SRAto replace wire (803).
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