TM 5-3895-385-23-1
0025
Table 1. SPN#108, FMI#4 ― Low Voltage at Barometric Pressure Circuit -- Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
4. Check active engine faults
1. If fault code SPN#3509, FMI#4
screen for fault code SPN#3509,
is displayed, turn keyless
FMI#4.
engine switch to the OFF
position (TM 5-3895-385-10),
and proceed to SPN#3509,
FMI#4 troubleshooting
procedure.
2. If fault code SPN#3509, FMI#4
is not displayed, turn keyless
engine switch to the OFF
position (TM 5-3895-385-10),
and proceed to next
malfunction.
2. Air pressure sensor fault.
1. Disconnect engine ECM wiring
harness connector W25 C10
from air pressure sensor (WP
0451, Vol 3, Figure 46).
2. Inspect air pressure sensor and
1. If damaged, replace air
connector pins for damage.
pressure sensor (WP 337, Vol
2).
2. If not damaged, proceed to
next test.
3. Inspect engine ECM wiring
1. If damaged, replace engine
harness connector W25 C10 for
ECM wiring harness (WP 0334,
damage.
Vol 2).
2. If not damaged, proceed to
next test.
4. Turn keyless engine switch to
the AUX position (TM 5-3895-
385-10), but do not start engine.
5. Measure voltage with multimeter
1. If voltage is between 4.75 to
from the engine ECM wiring
5.25 Volts Direct Current
harness connector W25 C10 +5
(VDC), turn keyless engine
volt SUPPLY pin (pin 1) to
switch to the OFF position (TM
engine ECM wiring harness
5-3895-385-10), and proceed
connector W25 C10 RETURN
to next test.
pin (pin 2) (WP 0443, Vol 3 and
WP 0451, Vol 3, Figure 46).
0025-2