52 KENR9126
Troubleshooting Section
Malfunctioning Individual Cylinder
1. With the engine speed at a fast idle, use the
electronic service tool to isolate one cylinder at
atime.Noteif
there is any reduction in engine
speed. If a reduction in engine speed is not noted,
the isolated cylinder is not operating under normal
conditions.
If the isolation of a particular cylinder
results in a reduction of engine speed that is less
than normal. The reduction in engine speed may
indicate th
at the cylinder is operating below normal
performance. Investigate the cause of the fault on
any cylinder that is not operating. Investigate the
cause of the
fault on any cylinder that is operating
below normal performance.
2. If all cyli
nders have been checked and there are
no faults with the cylinders, proceed to “Electronic
Unit Injectors”.
Electronic Unit Injectors
1. With the e
ngine speed at a f ast idle, use the
electronic service tool to isolate one cylinder at
a time. Note if there is any reduction in engine
speed. I
f a reduction in engine speed is not noted,
the isolated electronic unit injector is not operating
under normal conditions. If the isolation of a
particu
lar cylinder results in a reduction of engine
speed that is less than normal, this may indicate
that the electronic unit injector is operating below
normal
performance.
2. Remove the electronic unit injector from the
suspec
t cylinder.
3. Install a new electronic unit injector.
4. Repeat the test in 1. If the fault is still apparent,
remove the replacement electronic unit injector
and in
stall the original electronic unit injector.
i04010459
Engine Will Not C rank
Probable Causes
•
Battery cables and/or batteries
•
Starting motor solenoid
•
Starting circuit
•
Starting motor and/or flywheel ring gear
•
Electrical power supply
•
Internal engine fault
Recommended Re
pairs
Battery Cables and/or Batteries
1. Inspect the main power switch, battery posts,
and battery cables for loose connections and
corrosion. If
the battery cables are corroded,
remove the battery cables and clean the battery
cables. Clean the battery posts. Replace the
cables. Tigh
ten any loose connections.
2. Inspect the batteries.
a. Charge the batteries.
b. Load test th
e batteries.
Starting Motor Solenoid or Starting
Circuit
1. Test the operation of the starting motor solenoid.
2. Check the wiring to the starting motor solenoid.
Starting
Motor and/or Flywheel Ring Gear
1. Test the operation of the starting motor. Check the
wiring f
or the starting motor.
2. Inspect the pinion on the starting motor and the
flywheel
ring gear for damage.
Electrical Power Supply
Check the electrical power supply. Refer to
Troubleshooting, “Electrical Power Supply Circuit -
Test”
.
Internal Engine Fault
1. Remove the glow plugs.
2. Atte
mpt to rotate the crankshaft through 360
degrees in both directions. If the crankshaft
rotates correctly but fluid is expelled from the hole
for t
he glow plug, investigate the cause of the fluid
in the cylinder.
3. If t
he crankshaft does not rotate through 360
degrees in both directions, perform the following
procedure:
a. Disassemble the engine.
b. In
spect the internal components for the
following conditions:
•
Se
izure
•
Broken components
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