TM 10-3930-675-20-1
0012 00-2
ELECTRONIC CONTROL UNIT (ECU) INPUT VOLTAGE TROUBLESHOOTING - CONTINUED
0012 00
Table 1. Error Code 121 - Supply Voltage to Servo ECU (790) Failure
Troubleshooting Procedures - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Error Code 121 - Supply Voltage to Servo ECU
(790) Failure - Continued
6. Check
for
voltage
at
connector X154 pin 4.
If voltage is present, notify SRA.
7. Check
for
voltage
at
emergency stop switch pin 2
(wire 1544).
If voltage is present, notify SRA
to replace wire (1544).
8. Check
for
voltage
at
connector X154 pin 1.
If voltage is present, notify SRA
to replace wire (1541).
9. Check
for
voltage
at
connector X150 pin 1.
If voltage is present, notify SRA
to replace wire (1501).
10.Check
for
voltage
at
connector X30 pin 1.
If voltage is present, notify SRA
to replace wire (301).
11.Check for voltage at circuit
breaker F30.
If voltage is present, notify SRA
to replace wire (A301).
12.Check for voltage at relay
315 pin 87.
If voltage is present, notify SRA
to replace wire (A808A).
13.Check
for
voltage
at
connector X80 pin 3.
If voltage is present, notify SRA
to replace wire (A804).
14.Check
for
voltage
at
automatic circuit breaker
F50-2.
If voltage is present, notify SRA
to replace wire (803).
