TM 5-3895-385-23-1
0067
Table 1. SPN#729, FMI#3 ― High Voltage at Intake Air Heater Signal Circuit -- Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2. Inspect engine interface wiring
1. If damaged, replace engine
harness connector and ECM
interface wiring harness (WP
connector W16 J2 for damage
0388, Vol 2).
and loose pins.
2. If not damaged, proceed to next
test.
3. Inspect ECM and ECM pins for
1. If damaged, replace engine
damage.
ECM (WP 0332, Vol 2).
2. If not damaged, proceed to next
malfunction.
5. Open circuit in intake air heater
1. Measure resistance between
1. If resistance is more than 10 Ω,
relay return circuit.
intake air heater RETURN and
proceed to next test.
ground (WP 0443, Vol 3 and
WP 0448, Vol 3, Figure 57).
2. If resistance is less than 10 Ω,
proceed to next malfunction.
2. Disconnect grid heater wiring
harness W17 J1 from engine
interface wiring harness W16
J4 (WP 0451, Vol 3, Figure 35
and Figure 37).
3. Inspect grid heater wiring
1. If W17 damaged, replace grid
harness connector W17 J1 and
heater wiring harness (WP
engine interface harness W16
0392, Vol 2).
J2 for damage and loose pins.
2. If W16 damaged, replace
engine interface harness (WP
0388, Vol 2).
3. If not damaged, proceed to next
test.
4. Measure resistance between
1. If resistance is more than 10 Ω,
intake air heater RETURN and
replace grid heater wiring
pin B on W17 J1 (WP 0443, Vol
harness W17 (WP 0392, Vol 2).
3).
2. If resistance is less than 10 Ω,
proceed to next test.
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