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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1987 (Engine Controls And Fuel - 3.6L (LCS) - DTC P0008 To DTC P0193) >> DTC P0087, P0088, or P0089 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Circuit/System Verification must be performed first or misdiagnosis may result.
  1. Ignition OFF, open the hood to disable the Auto-Stop function.
  2. Ignition ON, verify the scan tool hood position parameter displays Open.
    • If the hood position does not display Open, refer to DTC P254F .
    3. NOTE: This step only tests the supply pressure from the in-tank fuel pump.
  3. Ignition ON, observe the FPCM fuel line pressure sensor scan tool parameter. Command an increase in the fuel line pressure with a scan tool. Verify the fuel line pressure increases to greater than 410 kPa (60 psi) as commanded.
    4. NOTE: 2 Ω on either circuit of fuel pressure regulator (FRP) solenoid will set a DTC. Test the circuits of the FRP solenoid for a high resistance if you suspect a condition.
  4. Remove the high pressure fuel pump assembly and visually inspect the lobes on the camshaft for unusual wear.
    • If the lobes appear normal, replace the high pressure fuel pump assembly.
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