Engine Controls - Revised DTC P0087 Diagnosis

File In Section: 06 - Engine/Propulsion System

Bulletin No.: 02-06-04-030

Date: June, 2002

SERVICE MANUAL UPDATE

Subject:
Revised DTC P0087 Table

Models:
2001 Chevrolet and GMC C/K Pickup Models (Sierra, Silverado) with 6.6L Engine (RPO LB7 - VIN Code 1)

This bulletin is being issued to revise the DTC P0087 table in the Engine Controls-6.6L sub-section of the Service Manual. Please replace the current information in the Service Manual with the following information.

The following information has been updated within SI. If you are using a paper version of this Service Manual, please make a reference to this bulletin on the affected page.

Test Description








The numbers below refer to the step numbers on the diagnostic table shown.

2. If the fuel temperature is high enough to set DTC P0168, the fuel may be thin enough to cause this DTC to set.

3. The engine will not start if the fuel leak is large enough.

4. This step checks for an inaccurate fuel rail pressure sensor.

5. This step checks for a restriction in the fuel system between the fuel injection pump and the fuel tank.

6. This test checks to see if the fuel injection pump is able to supply maximum fuel pressure at idle. The fuel injection pump should be able to create 158 MPa at idle.

7. This step checks for a restriction in the fuel system between the fuel injection pump and the fuel tank that may only cause symptoms at higher engine speed and load conditions.

9. This step checks to see if the fuel rail pressure sensor wiring and ECM are functioning normally.

11. If the vacuum is still too high in the fuel supply system after replacing the fuel filter, there is a restriction in the fuel supply lines or sending unit in the fuel tank.





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