(Table 92, contd)
Troubleshooting Test Steps
Values Results
9. Cooling Fan
Note: Excessive operation of the cooling fan or damage to the
cooling fan will increase fuel consumption.
A. Check the operation and condition of the cooling fan.
Cooling fan Result: The cooling fan is operating excessively.
Repair: Repair or replace the faulty cooling fan
components.
Result: The cooling fan is damaged excessively.
Repair: Repair or replace the faulty cooling fan
components.
Result: The cooling fan is not operating excessively and is
not damaged.
Proceed to Test Step 10.
10. Reduced Pressure of Intake Air
Note: If the air pressure is lower than normal, the same power
can only be achieved by the following:
· Higher engine speed
· Injection of more fuel
Either of these conditions will increase the fuel consumption.
A. Check all pipes from the outlets of the turbocharger compres-
sor to the inlet manifold for leaks.
B. Check for the correct operation of the wastegate in the
turbocharger.
Intake air Result: There is a leak in the intake air system.
Repair: Repair the leak or replace the component that is
causing the leak.
Result: The turbocharger wastegate is not operating
correctly.
Repair: Replace the turbocharger.
Result: The air intake system and the wastegate are OK.
Proceed to Test Step 11.
11. Excessive Valve Lash
A. Check for excessive valve lash.
Valve lash Result: The valve lash is incorrect.
Repair: Check the valve lash. Refer to Systems Operation,
Testing, and Adjusting, “Engine Valve Lash - Inspect” for
the correct procedure.
Result: The valve lash is correct.
Proceed to Test Step 12.
12. Failure of the Primary Speed/Timing Sensor
A. Crank the engine and observe the engine speed on the elec-
tronic service tool status screen.
Upon initial cranking, the status for engine speed may indicate
that the engine speed signal is abnormal. This message will be
replaced with an engine speed once the ECM is able to calcu-
late a speed from the signal.
Primary Speed/
Timing Sensor
Result: The primary speed/timing sensor is not operating
correctly.
Repair: Test the primary speed/timing sensor. Refer to
Troubleshooting, “Speed/Timing - Test”.
Result: The primary speed/timing sensor is operating
correctly.
Contact the Dealer Solutions Network (DSN).
UENR4469-36 189
Symptom Troubleshooting
Copyright of Perkins Engine Company Limited. NOT FOR REPRINTING OR RESALE
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