KENR6933 47
Troubleshooting Section
6. Check for air in the fuel system. Refer to Testing
and Adjusting,
“Air in Fuel - Test”.
7. Ensure that the fuel system has been primed.
Refer to Testi
ng and Adjusting, “Fuel System -
Prime”.
8. Attempt to sta
rt the engine. If the engine will not
start, continue with this procedure.
9. Replace the pr
imary fuel filter and the secondary
fuel filter. Refer to the Operation and Maintenance
Manual, “Fuel System Primary Filter (W ater
Separator) E
lement - Replace”.
10. Attempt to start the engine. If the engine will not
start, conti
nue with this procedure.
11. Check the flow of fuel through the transfer pump.
If the flow of f
uel through the transfer pump is
less than 250 mL per minute at 150 rpm, replace
the transfer pump. Refer to Disassembly and
Assembly, “
Fuel Transfer Pump - Remove” and
Disassembly and Assembly, “Fuel Transfer Pump
-Install”.
12. Attempt to start the engine. If the engine will not
start, proceed to “Electronic Control System”.
Electronic Control System
1. Connect th
e electronic service tool to the
diagnostic connector.
2. Check that
the pressure demand for the fuel rail
is at least 20 MPa (2900 psi) when the engine is
cranking.
3. Ifthepressuredemandforthefuelrailisless
than 20 MPa (2900 psi), perform the following
procedur
e:
a. Use the electronic service tool to check the
signal fr
om the secondary speed/timing sensor
while the engine is cranking.
b. If the sig
nal from the secondary speed/timing
sensor is 0 rpm, investigate the secondary
speed/timing sensor. Refer to Troubleshooting,
“Engine
Speed/Timing Sensor Circuit - Test”.
c. If a fault is identified in the circuit for the
seconda
ry speed/timing sensor, repair the fault
and then attempt to start the engine. If the
engine will not start, proceed to “High Pressure
Fuel Sys
tem”.
d. If the signal from the secondary speed/timing
sensor is great
er than 0 rpm, connect a test
ECM and then attempt to start the engine. If
the engine starts, install a replacement ECM.
If the engine w
ill not start, install the original
ECM and then proceed to “High Pressure Fuel
System”.
4. If the pressure demand for the fuel rail is greater
than 20 MPa (2900 psi), proceed to “High
Pressure Fue
l System”.
High Pressure Fuel System
1. Use the electronic service tool to check for
stable pressure in the fuel rail while the engine is
cranking at a
minimum speed of 150 rpm.
2. If the actual pressure in the fuel rail is less than
2 MPa (290 ps
i), perform the following procedure:
a. Connect a test ECM and then attempt to start
the engine.
b. If the engine starts, install a replacement ECM.
Refer to Tro
ubleshooting, “Replacing the ECM”.
c. If the engine will not start, install the original
ECM and cont
inue with this procedure.
d. Use the electronic service tool to perform a
solenoid t
est on the fuel rail pump.
e. If the fuel rail pump fails the solenoid test,
replace th
e fuel rail pump and then attempt to
start the engine. If the engine will not start,
repeat the diagnostic process from “Machine
Faults”.
f. If the fuel rail pump passes the solenoid test,
check the
timing of the fuel rail pump. Refer
to Systems Operation, Testing and Adjusting,
“Fuel Injection Timing - Check”.
g. If the timing of the fuel rail pump is correct,
replace the fuel rail pump and then attempt to
start the
engine. If the engine will not start,
repeat the diagnostic process from “Machine
Faults”.
h. If the timing of the fuel rail pump is incorrect,
adjust the timing. Refer to Systems Operation,
Testi n g
and Adjusting, “Fuel Injection Timing
- Check”. Attempt to start the engine. If the
engine will not start, replace the fuel rail pump.
i. Attempt to start the engine. If the engine will
not start, repeat the diagnostic process from
“Machi
ne Faults”.
3. If the actual pressure in the fuel rail is between
2MPa(2
90 psi) and 20 MPa (2900 psi), perform
the following procedure:
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