Troubleshooting
Table 24
Troubleshooting Test Steps Values Results
7. Fuel Rail Pressure Relief Valve (PRV)
A. Turn the keyswitch to the OFF position.
B. Disconnect plastic tube assembly (4) from fuel manifold (1).
Refer to Disassembly and Assembly, “Fuel Manifold (Rail) -
Remove and Install”.
C. Securely seal the end of plastic tube assembly (4).
Note: Plastic tube assembly (4) must be sealed to prevent air
ingress into the fuel system.
D. Attach a length of hose to fuel manifold (1) and secure with
a clip at position (3).
E. Place the other end of the hose into a container that is suit-
able for fuel. Ensure that the hose is secure and will not come
out of the container while the engine is running.
F. Turn the keyswitch to the ON position.
G. Crank the engine for a maximum of 30 seconds.
H. After the engine has stopped, check the container for fuel.
Fuel in container Result: Fuel is present in the container.
Repair: Install a replacement fuel manifold. Refer to Dis-
assembly and Assembly, “Fuel Manifold (Rail) - Remove
and Install”. When the fuel manifold has been replaced,
use the electronic service tool to perform the “Rail Pres-
sure Sensor Replacement Reset” .
Result: No fuel is present in the container.
Proceed to Test Step 8.
8. Fuel Pump Timing
A. Check the timing of the high-pressure fuel pump. Refer to
Systems Operation, Testing, and Adjusting, “Fuel Injection
Timing - Check”.
Fuel pump timing Result: The fuel pump timing is incorrect.
Repair: Make any necessary adjustments.
Attempt to start the engine. If the engine will not start, pro-
ceed to Test Step 9.
Result: The fuel pump timing is OK.
Proceed to Test Step 9.
9. Low Compression (Cylinder Pressure)
A. Perform a compression test. Refer to Systems Operation,
Testing, and Adjusting, “Compression - Test ”.
Low compression Result: Low compression is recorded on one or more
cylinders.
Possible causes of low compression are shown in the fol-
lowing list:
·Loose glow plugs
·Faulty piston
·Faulty piston rings
·Worn cylinder bores
·Worn valves
·Faulty cylinder head gasket
·Damaged cylinder head
Repair: Make any repairs, as necessary.
Attempt to start the engine. If the engine will not start, con-
tact the Dealer Solution Network (DSN).
Result: No faults found.
Contact the Dealer Solutions Network (DSN).
62 UENR0612-07
Symptom Troubleshooting
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