TM 10-3930-675-24-1
ELECTRONIC CONTROL UNIT (ECU) SUPPLY VOLTAGE TROUBLESHOOTING - CONTINUED
0016 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 1. Ensure circuit breakers F26 Reset circuit breaker(s).
Steering ECU (792).
and F29 are not tripped.
2. Check voltage (22V to 26V) at a. If voltage is found but less than
connector X174 at pins 3 and
18V, check the condition and
14 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
non-operational
alternator (WP 0070 00).
3. Check for voltage (22V to a. If no voltage (22V to 26V) is
26V) at connector X174 at pins
found at either pin, check
3 and 14 with the engine
circuit breakers F26 and F29
running (WP 0048 00-16).
and continuity of wires A473,
A478 (WP 0048 00-16).
b. Replace damaged or non-
operational 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 (792) at pins 1, 3,
found, replace ECU (792)
4, and 5 with the ignition ON
(WP 0080 00).
(WP 0048 00-16).
b. If no voltage (22V to 26V) is
found at any one pin, check
continuity of wires A17414,
7923 and A1743A (WP 0048
00-16).
c. Repair or replace damaged
connector (WP 0113 00).
d. Replace damaged or open
wire.
0016 00-2
