46 KENR9126
Troubleshooting Section
High Pressure Fu el System
1. Use the electronic service tool to check the
absolute fuel rail pressure while the engine is
cranking at a m
inimum speed of 150 rpm.
2. If the absolute fuel rail pressure is less than
25 MPa (3625 p
si), perform the following
procedure:
a. Check that t
he inlet pressure at the fuel rail
pump is greater than 50 kPa (7.25 psi). If the
inlet pressure is less than 50 kPa (7.25 psi),
repeat the d
iagnostic process from “Low
Pressure Fuel System”.
b. Chec k for f
uel leaks in the high-pressure
fuel system. Rectify any fuel leaks and then
recheck the pressure in the fuel rail. If the fuel
rail press
ure is greater than 25 MPa (3625 psi),
proceed to test step 3.
c. Use the el
ectronic service tool to perform a
solenoid test on the fuel rail pump. Refer to
Troubleshooting, “Fuel Rail Pump Solenoid -
Test”.
d. If any service has been performed as a result
of Step 2
.c, attempt to start the engine. If the
engine will not start, repeat the diagnostic
process from “Diagnostic Codes”.
e. Check the pressure relief valve in the fuel
rail for leakage. If the pressure relief valve is
leakin
g, replace the valve and recheck the
pressure in the fuel rail.
f. If the
pressure relief valve in the fuel rail is not
leaking, check for fuel in the engine oil system.
If fuel is suspected in the oil system, take an
engin
e oil sample for analysis. If the analysis
confirms that there is fuel in the engine oil
system, investigate the cause.
g. If fuel is not found in the oil system, check the
electronic unit injectors for excessive fuel leak
off.
h. If the leak off is greater than 38 mL (1.3 oz) in
30 s
econds for a 6 cylinder engine, replace the
electronic unit injectors.
Not
e: The fault is not in the fuel rail pump. Do not
replace the pump.
i. If
the leak off is less than 38 mL (1.3 oz) in 30
seconds for a 6 cylinder engine, proceed to
Test Step 3.d.
3. If the absolute fuel rail pressure is greater
than 25 MPa (3625 psi), perform the following
p
rocedure:
a. Use the electronic service tool to make sure
that the status
of the electronic unit injectors
is not “Disabled”. If the injectors are disabled
but the injectors were not intentionally disabled
with the elect
ronic service tool, proceed to test
step 3.d.
b. If the electr
onic unit injectors are not disabled,
use the electronic service tool to perform an
injector solenoid test. Refer to Troubleshooting,
“Injector S
olenoid Circuit - Test”.
c. If any service has been performed as a result
of Step 3.b,
attempt to start the engine. If the
engine will no t start, proceed to “Glow Plugs”.
d. Make sure t
hat the latest flash file for the
application is installed in the ECM. Refer to
Troubleshooting, “Flash Programming”.
e. Consult a Perkins dealer.
Note: Thi
s consultation can greatly reduce the repair
time.
f. If the Per
kins dealer recommends the use
ofatestECM,installatestECM.Referto
Troubleshooting, “Replacing the ECM”.
g. Attempt to start the engine. If the engine will not
start, install the original ECM and then proceed
to
Tes
t S
tep 3.l.
h. If the engine starts normally, stop the engine
and the
n attempt to start the engine again. If
the engine will not start at the second attempt,
proceed to Test Step 3.k.
i. If the engine starts normally, reconnect the
suspect ECM and then verify that the fault
retur
ns when the suspect ECM is installed.
j. If the engine will not start with the suspect
ECM,
replace the ECM. Check that the engine
starts normally. If the engine starts normally, no
further testing is required.
k. Replace the ECM again and then replace the
fuel rail pump. Verify that the fault has been
eli
minated. If the engine will not start, proceed
to “Glow Plugs”.
l. Che
ck the timing of the fuel rail pump.
m. If the timing of the fuel rail pump required
ad
justment and the engine will not start,
proceed to “Glow Plugs”.
n. If
the timing of the fuel rail pump was correct,
replace the fuel rail pump. If the engine will not
start, proceed to “Glow Plugs”.
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