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. Open circuit in intake air heater
1. Disconnect intake air heater
relay.
lines W17 from intake air heater
relay (WP 0392, Vol 2).
2. Measure resistance between
1. If resistance is 100 Ohm (Ω) or
intake air heater SIGNAL post
more, replace intake air heater
and intake air heater RETURN
relay (WP 0392, Vol 2).
post at intake air heater relay
(WP 0443, Vol 3 and WP 0448,
Vol 3, Figure 26).
2. If resistance is less than 100 Ω,
restore equipment to original
condition, and proceed to next
malfunction.
3. Voltage problem between
1. Disconnect intake air heater
SIGNAL line and RETURN line
lines from intake air heater (WP
on intake air heater circuit.
0392, Vol 2).
2. Install fuse box (WP 0277, Vol
2).
3. Connect battery cables (WP
0357, Vol 2).
4. Turn keyless engine switch to
AUX position (TM 5-3895-385-
10), but do not start engine.
5. Measure voltage between
1. If voltage is greater than 3.75
intake air heater relay SIGNAL
Volts Direct Current (VDC), turn
line (line 3) and intake air
keyless engine switch to OFF
heater relay RETURN line (line
position (TM 5-3895-385-10),
4) at intake air heater (WP
and proceed to malfunction 7.
0443, Vol 3 and WP 0448, Vol
3, Figure 27).
2. If voltage is less than 3.75
VDC, turn keyless engine
switch to OFF position (TM 5-
3895-385-10), and proceed to
next malfunction.
4. ECM connector pins or engine
1. Disconnect engine interface
interface wiring harness
wiring harness ECM connector
damaged.
W16 J2 from ECM (WP 0451,
Vol 3, Figure 36).
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