TM 10-3930-675-24-1
ELECTRONIC CONTROL UNIT (ECU) SUPPLY VOLTAGE TROUBLESHOOTING - CONTINUED
0016 00
Table 5. 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 1. Ensure circuit breakers F27 Reset circuit breaker(s).
Transmission ECU (793).
and F28 are not tripped.
2. Check for voltage (22V to a. If voltage is found but less than
26V) at connector X174 at pins
18V, check the condition and
1 and 2 with the engine running
charge of the vehicle batteries.
(WP 0048 00-16).
b. Check voltage output of
alternator at either NATO
slave receptacle.
c. Charge or replace discharged
vehicle batteries (WP 0108 00
and WP 0110 00).
d. Replace defective alternator
(WP 0070 00 and WP 0071
00).
3. Check for voltage (22V to a. If no voltage (22V to 26V) is
26V) at connector 174 at pins
found at either pin, check
1 and 2 with the engine running
circuit breakers F27 and F28
(WP 0048 00-16).
and continuity of wires A471
and A472 (WP 0048 00-12).
b. Replace damaged or defective
circuit breaker (WP 0074 00).
c. Repair or replace damaged
connector (WP 0113 00).
d. Replace damaged or open
wire.
4. Check for voltage (22V to a. If voltage (22V to 26V) is
26V) at ECU (793) at pins 23,
found, replace ECU (793)
45, and 68 with the ignition ON
(WP 0080 00).
(WP 0048 00-12).
b. If no voltage (22V to 26V) is
found at any one pin, check
continuity of wires A1741A,
A1741B, and A1742A (WP
0048 00-12).
c. Repair or replace damaged
connector (WP 0113 00).
d. Replace damaged or open
wire.
0016 00-7
