TM 5-3895-385-23-1
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Table 1. SPN#729, FMI#4 ― Low Voltage at Intake Air Heater Signal Circuit -- Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2. If fault code SPN#729, FMI#4 is
not active, turn keyless engine
switch to OFF position (TM 5-
3895-385-10). No fault present;
restore equipment to original
condition.
4. ECM and engine interface
1. Disconnect engine interface
wiring harness connector pins
wiring harness connector W16
damaged.
J2 from engine ECM (WP 0451,
Vol 3, Figure 36).
2. Inspect engine interface wiring
1. If damaged, replace engine
harness connector W16 J2 and
interface wiring harness (WP
connector pins for damage.
0388, Vol 2).
2. If not damaged, proceed to next
test.
3. Inspect engine ECM connector
1. If damaged, replace engine
and connector pins for damage.
ECM (WP 0332, Vol 2).
2. If not damaged, proceed to next
malfunction.
5. Harness relay pin short circuit
1. Disconnect engine interface
to ground.
wiring harness connector W16
J4 from intake air heater wiring
W17 J1 (WP 0451, Vol 3,
Figure 35).
2. Measure resistance between
1. If resistance is not more than
intake air heater relay SIGNAL
100 kiloOhms (kΩ), replace
pin (pin 40) at engine interface
engine interface wiring harness
harness connector W16 J2 and
(WP 0388, Vol 2).
ground (WP 0443, Vol 3 and
WP 0448, Vol 3, Figure 38).
2. If resistance is more than 100
kΩ, proceed to next
malfunction.
6. Pin to pin short circuit in engine
1. Measure resistance between
1. If resistance is more than 100
interface wiring harness.
intake air heater relay SIGNAL
kΩ, replace engine interface
pin (pin 40) at engine interface
wiring harness (WP 0388, Vol
wiring harness connector W16
2).
J2 and all other pins in
connector W16 J2 (WP 0443,
Vol 3 and WP 0448, Vol 3,
Figure 39).
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