TM 5-3895-385-23-1
0038
Table 1. SPN#157, FMI#4 ― Low Signal Voltage at Rail Fuel Pressure Sensor Circuit -- Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2. Inspect the rail fuel pressure
1. If damaged, replace the rail fuel
sensor and connector pins (WP
pressure sensor (WP 0337, Vol
0334, Vol 2).
2).
2. If not damaged, proceed to next
test.
3. Inspect the W25 engine ECM
1. If damaged, replace the W25
wiring harness and rail fuel
engine ECM wiring harness
pressure sensor connector W25
(WP 0334, Vol 2).
C1 and connector pins for
damage or loose pins (WP
0334, Vol 2).
2. If not damaged, proceed to next
malfunction.
3. Sensor supply voltage or return
1. Turn keyless engine switch to
circuit error.
the AUX position (TM 5-3895-
385-10), but do not start engine.
2. Measure the voltage between
1. If voltage is between 4.75 Volts
W25 C6 rail fuel pressure
Direct Current (VDC) and 5.25
connector +5 volt SUPPLY pin
VDC, turn keyless engine
(pin 3) and W25 C6 rail fuel
switch to the OFF position (TM
pressure connector RETURN
5-3895-385-10), and proceed to
pin (pin 1) (WP 0443, Vol 3 and
next test.
WP 0448, Vol 3, Figure 1).
2. If voltage is not between 4.75
VDC and 5.25 VDC, turn
keyless engine switch to the
OFF position (TM 5-3895-385-
10), and proceed to next
malfunction.
3. Turn keyless engine switch to
the AUX position (TM 5-3895-
385-10), but do not start engine.
Wait 30 seconds.
4. Check active engine faults
1. If fault code SPN#157, FMI#3 is
screen for fault code SPN#157,
displayed, turn keyless engine
FMI#3.
switch to the OFF position (TM
5-3895-385-10), and proceed to
next test.
0038-3