TM 10-3930-675-24-1
ELECTRONIC CONTROL UNIT (ECU) SUPPLY VOLTAGE TROUBLESHOOTING - CONTINUED
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Table 6. 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 Check output voltage from
If output voltage is higher than
Transmission ECU (793).
26V, replace alternator (WP 0070
00).
Table 7. Error Code 813 - Voltage Failure at Transmission Gearshift Valve Power Supply Troubleshooting Procedures.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Error Code 813 - Voltage Failure at Transmission 1. Ensure circuit breaker F27 is Reset circuit breakers.
Gearshift Valve Supply.
not tripped.
2. Check for voltage (22V to a. If no voltage (22V to 26V) is
26V) at connector X174 at pin
found, check circuit breaker
1 with the engine running (WP
F27 and continuity of wires
0048 00-16).
A471 (WP 0048 00-32) and
471 (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.
3. Disconnect ECU (793) and a. If no voltage (22V to 26V) is
inspect ECU and connector
found at any one pin, check
pins for damage. Check for
continuity of wires A1471A
voltage (22V to 26V) on the
and A1741B (WP 0048 00-
ECU (793) connector at pins
12).
23 and 68 with the ignition ON b. Repair or replace damaged
(WP 0048 00-12).
connector (WP 0113 00).
c. Replace damaged or open
wire.
d. If voltage (22V to 26V) is
found, replace ECU (793)
(WP 0080 00).
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