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Home >> Chevrolet >> 2006 >> Cobalt LTZ >> Repair and Diagnosis >> External Pages >> Different car >> Section 780 (Engine Controls And Fuel - 2.0L - DTC P0010 To DTC P0299) >> DTC P0087, P0088, or P0089 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: Circuit/System Verification must be performed first or misdiagnosis may result.
  1. Verify the correct low side fuel system pressure. Refer to Fuel System Diagnosis .
  2. Remove the high pressure pump assembly and visually inspect the lobes on the camshaft for wear.
    • If the lobes are normal, replace the mechanical fuel pump assembly.
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