|1||Did you perform the Diagnostic System
Check - Vehicle?
|Go to Step 2||Go to
System Check -
|2||Are any DTCs set other than P0300, P0301- P0308?||Go to Diagnostic
(DTC) List -
|Go to Step 3|
|3||Does the customer concern occur at idle or during tip-in acceleration off-idle?||Go to Step 4||Go to Step 6|
|4||1. Start and run the engine until the
engine coolant temperature (ECT)
is more than 82°C (180°F).
2. Turn OFF all accessories.
3. Hold the brake pedal in the fully
applied position. A hiss will be
noticeable when the brake is fully
4. Place the transmission in Drive.
5. Idle the engine for more than 30
6. Record the Balancing Rate Cyl.1-8
parameters from the scan tool while
the engine is at idle speed.
7. Repeat steps 2-6 with the
transmission in Neutral.
Are all of the Balancing Rate parameters
within the first specified range in Drive, and
the second specified range in Neutral?
|Go to Step 6||Go to Step 5|
|5||Graph the Fuel Pressure Regulator. Refer to Fuel Pressure Regulator Diagnosis .Is the fuel pressure regulator graph normal?||Go to Step 7||Go to Step 9|
|6||IMPORTANT: The fuel Cylinder Power Balance Test must be performed under the conditions for which the concern occurred. The concern must be duplicated during the test. IMPORTANT: DO NOT operate the cruise control during this test. Cruise control reactivation after the test may cause a brief extreme increase in engine speed. 1. Observe the cylinder power contribution or other customer concern. 2. Perform the Cylinder Power Balance Test in Special Functions.Do any of the cylinders indicate a different cylinder power contribution than the others, or lessen the customer concern?||Go to Step 7||System OK|
|7||IMPORTANT: A fuel injector leak into the combustion chamber may result in mechanical damage to the cylinder. If any fuel spray comes out of a glow plug hole during the compression test, replace the fuel injector of the affected cylinder. Perform the Engine Compression test. Refer to Engine Compression Test in Engine Mechanical - 6.6L.Do any of the cylinders have low compression?||Go to Symptoms - Engine Mechanical in Engine Mechanical - 6.6L||Go to Step 8|
|8||IMPORTANT: Refer to Injection System Components in Engine Controls Component Views . Failure to correctly identify the cylinder positions may result in the replacement of the wrong fuel injector. Replace the fuel injectors on the cylinders that had poor cylinder power contribution, high balance rates, or a noise/smoke change. Refer to Fuel Injector Replacement (Left) or Fuel Injector Replacement (Right) .Did you complete the replacements?||Go to Step 10|
|9||Replace the fuel pressure regulator. Refer to Fuel Pressure Regulator Replacement. Did you complete the replacement?||Go to Step 10|
|10||Operate the vehicle under the conditions in which the concern occurred.Does the system operate normally, with no DTCs or symptoms?||System OK||Go to