(Table 74, contd)
Troubleshooting Test Steps
Values Results
8. High-Pressure Fuel Pump SCV
A. Use the electronic service tool to perform a solenoid test on the
fuel injection pump. Refer to Troubleshooting, “Solenoid Valve -
Test”.
HP fuel pump Result: The solenoid valve test fails.
Repair: Replace the HP fuel pump SCV and solenoid
assembly.
Result: The solenoid valve test passes successfully.
Proceed to Test Step 9.
9. High-Pressure Fuel Pump
Note: The fuel injection pump that is installed by the factory is a
nonserviceable item. If any fault occurs within the fuel injection
pump, the fuel injection pump must be replaced.
A. Use the electronic service tool to select the correct screen to
display any diagnostic trouble codes that relate to the fuel injection
pump.
HP fuel pump Result: There are diagnostic codes associated with the
high-pressure fuel pump.
Repair: Diagnose the codes. Refer to Troubleshooting,
“Troubleshooting with a Diagnostic Code”.
If necessary, replace the high-pressure fuel pump.
Result: The high-pressure fuel pump is OK.
Proceed to Test Step 10.
10. Low Compression (Cylinder Pressure)
A. Perform a compression test. Refer to Systems Operation, Test-
ing, and Adjusting, “Compression - Test”.
Cylinder
compression
Result: The results of the compression test are outside
the specifications.
Repair: Investigate the cause and rectify any faults.
Note: Possible causes of low compression are shown in
the following list:
· Loose glow plugs
· Faulty piston
· Faulty piston rings
· Worn cylinder bores
· Worn valves
· Faulty cylinder head gasket
· Damaged cylinder head
Result: The results of the compression test are OK.
Proceed to Test Step 11.
(continued)
152 UENR4469-36
Symptom Troubleshooting
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