KENR9126 45
Troubleshooting Section
•
Use the electronic service tool to check the
average cranki
ng speed of the engine. If the
cranking speed is less than 150 rpm, investigate
the cause of the low cranking speed.
•
Make sure that all fuel filters are correctly
installed.
•
Drain any water from the primary fuel filter/water
separator.
3. Rectify any faults that are found during the visual
checks.
4. Attempt to start the engine. If the engine will not
start, proceed to “Air Intake and Exhaust System”.
Air Intake and Exhaust System
1. Check the a
ir filter restriction indicator, if equipped.
2. Ensure that the air filter is clean and serviceable.
3. Check the air intake and exhaust systems for the
following defects:
•
Blockages
•
Restric
tions
•
Damage to lines or hoses
4. Repair any defects before attempting to restart
the engine.
5. Attempt to start the engine. If the engine will not
start, proceed to “Primary Speed/timing Sensor”.
Primary Speed/timing Sensor
1. Dis co
nnect connector A-C4 from the primary
speed/timing sensor.
2. Atte
mpt to start the engine.
3. If the engine starts, check for a fault in the circuit
for t
he primary speed/timing sensor. Refer to
Troubleshooting, “Engine Speed/Timing Sensor
Circuit - Test”.
4. If the engine does not start, inspect the timing ring
on the crankshaft for misalignment.
5. If necessary, replace the crankshaft timing ring.
6. At
tempt to start the engine. If the engine will not
start, proceed to “Low Pressure Fuel System”.
Lo
w P ressure Fuel S ystem
1. If the temperature is below 0 °C (32 °F), check
f
or solidified fuel (wax).
2. Check for fuel supply lines that are restricted.
3. Check that the low-pressure fuel lines are correctly
installed.
4. Check the diesel fuel for contamination.
5. Check for air
in the fuel system.
6. Ensure that the fuel system has been primed.
7. Attempt to start the engine. If the engine will not
start, continue with this procedure.
8. Replace the primary fuel filter and the secondary
fuel filter.
9. Attempt to start the engine. If the engine will not
start, continue with this procedure.
10. Check the flow of fuel through the transfer pump.
If the flow of fuel through the transfer pump is less
than 250 m
L per minute at 150 rpm, replace the
transfer pump.
11. Attempt t
o start the engine. If the engine will
not start, proceed to “Secondary Speed/timing
Sensor”.
Secondary Speed/timing Sensor
1. Connec
t the electronic service tool to the
diagnostic connector.
2. Check t
hat the desired fuel rail pressure is at least
25 MPa (3625 psi) when the engine is cranking.
3. If the
desired fuel rail pressure is less than 25 MPa
(3625 psi), perform the following procedure:
a. Use th
e electronic service tool to check the
signal from the secondary speed/timing sensor
while the engine is cranking.
b. If the signal from the secondary speed/timing
sensor is 0 rpm, investigate the secondary
spee
d/timing sensor. Refer to Troubleshooting,
“Engine Speed/Timing Sensor Circuit - Test”.
c. If a
fault is identified in the circuit for the
secondary speed/timing sensor, repair the fault
and then attempt to start the engine. If the
eng
ine will not start, proceed to “High Pressure
Fuel System”.
d. If
the signal from the secondary speed/timing
sensor is greater than 0 rpm and the engine
will not start, proceed to “High Pressure Fuel
Sy
stem”.
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