TM 10-3930-675-20-1
0015 00-2
ELECTRONIC CONTROL UNIT (ECU) SUPPLY VOLTAGE TROUBLESHOOTING - CONTINUED
0015 00
Table 2. Error Code 452 - Voltage Supply Too Low for Steering ECU (792) Troubleshooting Procedures.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Error Code 452 - Voltage Supply Too Low for
Steering ECU (792)
1. Remove cab circuit breaker
panel and ensure that circuit
breakers F26 and F29 are not
tripped.
Reset circuit breaker(s) as
required (WP 0073 00).
2. Perform voltage check at
slave
receptacle.
Input
voltage should be 22-26V. If
voltage is present, but below
18V, perform the following:
a. Check
condition
and
voltage of batteries (WP
0025 00).
a. Charge or replace batteries as
required (WP 0107 00).
b. Check
condition
of
alternator and alternator
drive belt (WP 0069 00 and
WP 0070 00).
b. Replace alternator or tighten
or replace alternator drive belt
(WP 0069 00 or WP 0070 00).
c. Check charging rate of
alternator at either slave
receptacle, with lights on.
c. If alternator is not charging
properly, replace alternator
(WP 0069 00).
3. Check voltage at ECU (792)
connector pin 1 and pin 5.
If voltage is present, notify SRA.
4. Check voltage at connector
X174 pin 14.
If voltage is present, notify SRA
to replace wire A17414.
5. Check voltage at connector
X47 pin 8.
If voltage is present, notify SRA
to replace wire 478.
6. Check voltage at connector
X174 pin 3.
If voltage is present, notify SRA
to replace wire A1743A.
7. Check voltage at connector
X47 pin 3.
If voltage is present, notify SRA
to replace wire 473.
Table 3. Error Code 811 - Voltage Supply Too Low for Transmission ECU (793) Troubleshooting Procedures.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Error Code 811 - Voltage Supply Too Low for
Transmission ECU (793)
1. Remove cab circuit breaker
panel and ensure that circuit
breakers F27 and F28 are not
tripped.
Reset circuit breaker(s) as
required (WP 0073 00).
