TM 10-3930-675-20-1
0015 00-3
ELECTRONIC CONTROL UNIT (ECU) SUPPLY VOLTAGE TROUBLESHOOTING - CONTINUED
0015 00
Table 3. Error Code 811 - Voltage Supply Too Low for Transmission ECU (793)
Troubleshooting Procedures - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Error Code 811 - Voltage Supply Too Low for
Transmission ECU (793) - Continued
2. Perform
voltage
check.
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 connector
793 pin 23, connector 793 pin
45, and connector 793 pin 68.
If voltage is present, replace
ECU (793) (WP 0079 00).
4. Check voltage at connector
X174 pin 2.
If voltage is present, notify SRA
to replace wire A1742A.
5. Check voltage at connector
X47 pin 2.
If voltage is present, notify SRA
to replace wire 472.
6. Check voltage at connector
X174 pin 1.
If voltage is present, notify SRA
to replace wire A1741A and
A1741B.
7. Check voltage at connector
X47 pin 1.
If voltage is present, notify SRA
to replace wire 471.
Table 4. Error Code 812 - Voltage Supply Too High for Transmission ECU (793) Troubleshooting Procedures.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Error Code 812 - Voltage Supply Too High for
Transmission ECU (793)
Check output voltage from
alternator.
If output voltage is higher than
26V, replace alternator (WP
0069 00).
