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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 87 (Engine Controls - Self-Diagnostics - 6.6L Diesel) >> Diagnostic Tests >> DTC P0088: Fuel Rail Pressure - High >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you perform the Diagnostic System Check-Engine Controls? If yes, go to next step. If no, see DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
  2. Perform the Fuel System Diagnosis to check for fuel system leaks before proceeding. See appropriate BASIC DIAGNOSTIC PROCEDURES article. Did you find and correct the condition? If yes, go to step  6. If no, go to next step.
  3. Did DTC P0090 also set? If yes, see DTC P0090: FUEL RAIL PRESSURE SENSOR CURRENT OUT OF RANGE . If no, go to next step.
  4. Start the engine. Observe the Actual Fuel Rail Pressure on the scan tool. Operate the vehicle within the Conditions for Running DTC or as close to the Freeze Frame/Failure Records data that you observed. Is the Actual Fuel Rail Pressure more 167 MPa? If yes, go to next step. If no, see DIAGNOSTIC AIDS .
  5. Replace the FRP regulator. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. After repairs, go to next step.
  6. Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running DTC. Does the DTC run and pass? If yes, go to next step. If no, go to step  2.
  7. Observe the stored information, Capture Info with a scan tool. Does the scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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