Table 129
Troubleshooting Test Steps
Values Results
1. Fuel Injector Seals
A. Check for signs of damage to the seals for the fuel
injectors.
Fuel injector
seals
Result: Injector seals are damaged.
Repair: Replace any damaged injector seals.
Drain and refill the engine oil. Refer to the Operation and
Maintenance Manual, “Engine Oil and Filter - Change”.
Result: All injector seals are OK.
Proceed to Test Step 2.
2. Fuel Injector Tip
A. Check for signs of damage to the fuel injectors. Check the
fuel injector tip for cracks or breakage.
Fuel injector tip Result: A fuel injector is damaged.
Repair: Replace the fuel injector. Refer to Disassembly and
Assembly, “Electronic Unit Injector - Remove” and Disassem-
bly and Assembly, “Electronic Unit Injector - Install”.
Drain and refill the engine oil. Refer to the Operation and
Maintenance Manual, “Engine Oil and Filter - Change”.
Result: All fuel injectors are OK.
Proceed to Test Step 3.
3. Shaft Seal for the High Pressure Fuel Pump
A. Check for fuel leakage around the shaft seal for the high-
pressure fuel pump.
HP fuel pump
shaft seal
Result: Fuel is leaking past the shaft seal for the high-pres-
sure fuel pump.
Repair: There is a restriction in the return line to the fuel tank.
Investigate the cause of the restriction and then repair the fuel
line.
Replace the high-pressure fuel pump. Refer to Disassembly
and Assembly, “Fuel Injection Pump - Remove” and Disas-
sembly and Assembly, “Fuel Injection Pump - Install”.
Replace the primary fuel filter and the secondary fuel filters.
Refer to the Operation and Maintenance Manual for further
information.
Replace the Transfer Pump Inlet Regulator (TPIR).
Inspect the return pipe from the high-pressure fuel pump to
the fuel tank. replace any pipes that have been damaged or
distorted by hot fuel.
Drain and refill the engine oil. Refer to the Operation and
Maintenance Manual, “Engine Oil and Filter - Change”.
Result: The shaft seal for the high-pressure fuel pump is OK.
If the fault is still present, contact the Dealer Solutions Net-
work (DSN).
UENR4469-36 241
Symptom Troubleshooting
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