TM 10-3930-675-24-1
ELECTRONIC CONTROL UNIT (ECU) INPUT VOLTAGE TROUBLESHOOTING - CONTINUED
0013 00
Table 3. Error Code 123 - 10V Reference Voltage for Servo ECU (790) Short Circuit Failure Troubleshooting
Procedures.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Error Code 123 - 10V Reference Voltage for Servo 1. Inspect ECU (790) connector a. Repair or replace damaged
ECU (790) Short Circuit Failure.
1. Check connector, harness,
wires or connectors (WP 0113
and ECU (790) for damage.
00).
b. Replace damaged ECU (790)
(WP 0080 00).
2. Enter "DIAG SERVO" 1(13)
If voltage is <1V, unplug X155
in the diagnostic menu. The
and X157 and recheck 10V REF
10V REF OUT voltage should
OUT voltage. If voltage (10V)
be around 10V.
returns, continue with step 3.
DIAG SERVO
1(13)
SYSTEM POWER
24.00V
POWER RI CAN
24.00V
POWER LE CAN
24.00V
10V REF OUT
10.00V
3. Reconnect X155 and but leave a. If voltage is <1V, unplug the
X157
unplugged.
Enter
joystick (WP 0083 00) and
"DIAG SERVO" 1(13) in the
recheck 10V REF OUT
diagnostic menu. Check 10V
voltage. If voltage (10V)
REF OUT voltage.
returns, replace joystick (WP
0082 00).
b. If voltage is 10V, continue
with step 4.
4. Reconnect X157 and enter a. If voltage is <1V, disconnect
"DIAG SERVO" 1(13) in the
the BK wire from X169 pin 2
diagnostic menu. Check 10V
REF OUT voltage.
10V REF OUT voltage. If
voltage
(10V)
returns,
continue with step 5.
b. If voltage (10V) does not
return, check wire BK for
short to ground (WP 0113 00).
c. Replace shorted harness (WP
0113 00).
5. Reconnect X169 pin 2 wire
If voltage is <1V, disconnect
BK. Disconnect wire GY from
X169 pin 2 wire GN and recheck
X169 pin 2 (WP 0048 00-9).
10V REF OUT voltage. If voltage
Enter "DIAG SERVO" 1(13)
(10V) returns, replace boom
in the diagnostic menu. Check
angle sensor (WP 0099 00).
10V REF OUT voltage.
0013 00-4
