TM 5-3895-385-23-1
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Table 1. SPN#729, FMI#3 ― High Voltage at Intake Air Heater Signal Circuit -- Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
5. Measure resistance between
1. If resistance is more than 10 Ω,
pin 2 on W16 J4 (WP 0443, Vol
replace engine interface wiring
3).
harness (WP 0388, Vol 2).
2. If resistance is less than 10 Ω,
replace grid heater wiring
harness (WP 0392, Vol 2).
6. Open circuit in engine interface
Measure resistance between
1. If resistance is more than 10 Ω,
wiring harness.
engine interface wiring harness
replace engine interface wiring
ECM connector W16 J2 intake air
harness (WP 0388, Vol 2).
heater relay SIGNAL pin (pin 40)
and intake air heater lines SIGNAL
line (WP 0443, Vol 3 and WP
0448, Vol 3, Figure 29).
2. If resistance is less than 10 Ω,
proceed to next malfunction.
7. Pin to pin short circuit in engine
1. Measure resistance between
1. If resistance is greater than 100
interface wiring harness.
intake air heater relay SIGNAL
kiloOhms (kΩ), restore
pin (pin 40) in engine interface
equipment to original condition,
wiring harness connector W16
and proceed to next test.
J2 and all other pins in engine
interface wiring harness ECM
connector W16 J2 (WP 0443,
Vol 3 and WP 0448, Vol 3,
Figure 30).
2. If resistance is less than 100
kΩ, replace engine interface
wiring harness (WP 0388, Vol
2).
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#3 is
screen for fault code SPN#729,
displayed, turn keyless engine
FMI#3.
switch to OFF (TM 5-3895-385-
10), and replace ECM (WP
0332, Vol 2).
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