TM 5-3895-385-23-1
0039
Table 1. SPN#157, FMI#16 ― Fuel Pressure Higher Than Commanded Pressure -- Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
7. Check active engine faults
1. If fault code SPN#633, FMI#31
screen for fault code SPN#633,
is displayed, turn keyless
FMI#31.
engine switch to OFF (TM 5-
3895-385-10), and proceed to
SPN#633, FMI#31
troubleshooting procedure.
2. If fault code SPN#633, FMI#31
is not displayed, proceed to
next malfunction.
2. Fuel pressure sensor
1. Disconnect the engine
malfunction.
Electronic Control Module
(ECM) wiring harness fuel
pressure sensor connector W25
C6 from fuel pressure sensor
(WP 0451, Vol 3, Figure 45).
2. Inspect the fuel pressure sensor
1. If damaged, replace the rail fuel
for damage or leaking.
pressure sensor (WP 0337, Vol
2).
2. If not damaged, proceed to next
test.
3. Inspect the engine ECM wiring
1. If damaged, replace the engine
harness connector W25 C6 and
ECM wiring harness W25 (WP
connector pins for damage.
0334, Vol 2).
2. If not damaged, restore
equipment to original condition,
and proceed to next
malfunction.
3. Restricted fuel drain line.
1. Inspect fuel lines for proper
1. If damaged, replace lines and
size, leaks, bends, or clogs and
fittings as needed (WP 0331,
damage (WP 0331, Vol 2).
Vol 2).
2. If not damaged, proceed to next
test.
2. Disconnect the fuel drain line
connecting the fuel pump drain
to the fuel return manifold (WP
0448, Vol 3, Figure 54).
0039-3
