(Table 74, contd)
Troubleshooting Test Steps
Values Results
11. Electronic Unit Injectors
A. Use the electronic service tool to perform the automatic “Cylin-
der Cut Out Test” .
Note: If the compression test that was performed in Test Step 9
was satisfactory, the “Cylinder Cut Out Test” will identify any faulty
injectors.
Electronic Unit
Injectors
Result: A faulty injector is indicated.
Repair: Remove any faulty electronic unit injectors. Refer
to Disassembly and Assembly, “Electronic Unit Injector -
Remove”.
Install new electronic unit injectors. Refer to Disassembly
and Assembly, “Electronic Unit Injector - Install”.
Repeat the automatic “Cylinder Cut Out Test” . If the fault
is still apparent, remove the replacement electronic unit
injector and install the original electronic unit injector. Re-
fer to Disassembly and Assembly, “Electronic Unit Injector
- Remove” and Disassembly and Assembly, “Electronic
Unit Injector - Install”.
Result: All injectors are OK.
Proceed to Test Step 12.
12. Individual Malfunctioning Cylinders
A. With the engine speed at a fast idle, use the electronic service
tool to perform the manual “Cylinder Cut Out Test” .
As each cylinder is cut out, listen for a change in the sound from
the engine. When a cylinder is cut out, there should be a notice-
able change in the sound of the engine.
If a change in the sound of the engine is not noted, the isolated
cylinder is not operating under normal conditions. If the isolation of
a cylinder results in a change in the sound that is less noticeable,
the cylinder may be operating below normal performance.
Cylinders Result: The test indicates a faulty cylinder.
Repair: 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.
Result: The test indicates that all cylinders are OK.
Contact the Dealer Solutions Network (DSN).
i08481015
Engine Overspeeds
This procedure covers the following diagnostic
trouble codes:
UENR4469-36 153
Symptom Troubleshooting
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