TM 5-3895-385-23-1
0068
Table 1. SPN#729, FMI#4 ― Low Voltage at Intake Air Heater Signal Circuit -- Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2. If not damaged, proceed to next
malfunction.
5. Inspect intake air heater wiring
1. If damaged, replace intake air
for damage.
heater wiring (WP 0392, Vol 2).
2. If not damaged, proceed to next
malfunction.
2. Circuit response incorrect.
1. Install fuse box (WP 0277, Vol
2).
2. Connect battery cables (WP
0357, Vol 2).
.
3. Turn keyless engine switch to
AUX position (TM 5-3895-385-
10), but do not start engine.
Wait for 30 seconds.
4. Check active engine faults
1. If SPN#729, FMI#3 is
screen for fault code SPN#729,
displayed, turn keyless engine
FMI#3.
switch to OFF position (TM 5-
3895-385-10), and proceed to
next malfunction.
2. If SPN#729, FMI#3 is not
displayed, turn keyless engine
switch to OFF position (TM 5-
3895-385-10), and proceed to
malfunction 4.
3. Failed intake air heater relay.
1. Restore equipment to original
condition.
2. Turn keyless engine switch to
AUX position (TM 5-3895-385-
10), but do not start engine.
Wait for 30 seconds.
3. Check active engine faults
1. If fault code SPN#729, FMI#4 is
screen for fault code SPN#729,
active, turn keyless engine
FMI#4.
switch to OFF position (TM 5-
3895-385-10), and replace
intake air heater relays (WP
0392, Vol 2).
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