TM 10-3930-675-20-1
0031 00-4
BRAKE SYSTEM TROUBLESHOOTING - CONTINUED
0031 00
Table 3. Error Code 120 - Brake System Pressure, Circuit 2 Failure Troubleshooting Procedures - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Error Code 120 - Brake System Pressure, Circuit
2 Failure - Continued
6. Remove cab circuit breaker
panel cover, open electrical
panel, and locate connector
X26.
7. Remove servo ECU (790)
cover from operator’s seat
base and slide ECU mounting
tray out (WP 0079 00).
8. Disconnect servo ECU (790)
connector 1. Ensure that
brake pressure is present.
9. Perform voltage checks at the
following pins:
a. X26 pin 6
b. X18 pin 1
c. brake pressure switch 204-
1 pin 1
d. brake pressure switch 204-
1 pin 4
e. X18 pin 2
f. X29 pin 5
g. X150 pin 9
h. servo ECU (790) connector
1 pin 40
a. When voltage is no longer
present,
inspect
wire
between
pin
where
voltage
stops
and
previous pin and replace
or repair connectors (WP
0111 00).
b. Replace ECU (790) (WP
0079 00).
c. If wiring harness must be
replaced, notify SRA.
