66 KENR6933
Troubleshooting Section
•
Fuel supply
•
Low compression (cylinder pressure)
•
Individual mal
functioning cylinder
•
Electronic unit injectors
Recommended Actions
NOTICE
Do not crank the engine continuously for more than
30 seconds. All
ow the starting motor to cool for two
minutes before cranking the engine again.
Diagnostic Cod
es
Check for active diagnostic codes on the electronic
service tool.
Troubleshoot any active codes before
continuing with this procedure.
ECM Parameter
s
1. Use the electronic service tool to make sure that
the FLS and FTS
parameters have been correctly
entered.
2. Use the elect
ronic service tool to ensure that the
correct mode was selected.
3. Use the elect
ronic service tool to verify that the
correct engine rating has been provided.
4. Use the elect
ronic service tool to verify the
maximum engine speed limit.
5. Ensure that t
he repairs have eliminated the
performance problems.
6. If the repai
rs have not eliminated the faults
proceed to “Electrical Connectors”.
Electrical
Connectors
1. Turn the keyswitch to the ON position.
2. Use the electronic service tool to verify that
the intake manifold pressure is 0 ± 0.5 kPa
(00 ± 0.070 p
si). Check the 5 V sensor supply
for the intake manifold pressure. Refer to
Troubleshooting, “5 Volt Engine Pressure Sensor
Supply Cir
cuit - Test”.
3. Use the electronic service tool to verify the throttle
position s
tatus.
4. Run the engine until the speed is equal to the
maximum no
-load speed.
5. Use the electronic service tool to make sure that
the throttle is
set to reach the maximum no-load
speed.
6. If the maximum
no-load speed can not be obtained
refer to Troubleshooting, “Throttle Switch Circuit
- Test” and Troubleshooting, “Mode Selection
Circuit - Tes
t”.
7. If the engine speed is erratic refer to
Troubleshoo
ting, “Analog Throttle Position Sensor
Circuit - Test” or Troubleshooting, “Digital Throttle
Position Sensor Circuit - Test”.
8. If the fault has not been eliminated, proceed to
“Air Intake and Exhaust System”.
Air Intake and Exhaust System
1. Check the air
filter restriction indicator, if equipped.
2. Ensure that the air filter is clean and serviceable.
3. Check the air intake and the exhaust system for
the following defects:
•
Blockages
•
Restrictio
ns
•
Damage to the air intake and exhaust lines and
hoses
4. Make all necessary repairs to the engine.
5. If the fault has not been eliminated, proceed to
“Valve Lash”.
Valve Lash
1. Check the va
lve lash and reset the valve lash, if
necessary. Refer to Testing and Adjusting, “Engine
Valve lash - Inspect and Adjust”.
2. If the repair does not eliminate the fault proceed
to “Turbocharger”.
Turbocharger
Note: The t
urbocharger that is installed on this
engine is a nonserviceable item. If any mechanical
fault exists, except for the wastegate actuator, then
the turbo
charger must be replaced. The wastegate
actuator can be replaced.
1. Ensure th
at the mounting bolts for the turbocharger
are tight.
2. Check tha
t the oil drain for the turbocharger is not
blocked or restricted.
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