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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 P0089: Fuel Rail Pressure Out Of Range >> 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. Did DTC P0090 also set? If yes, see DTC P0090: FUEL RAIL PRESSURE SENSOR CURRENT OUT OF RANGE . If no, go to next step.
  3. Did DTC P1093 also set? If yes, see DTC P1093: FUEL RAIL PRESSURE OUT OF RANGE . If no, go to next step.
  4. Start and run the engine at 2000 RPM. Observe the Actual Fuel Rail Pressure and the Desired Fuel Rail Pressure with a scan tool. Does the fuel pressure difference measure less than 20 MPa? If yes, see INTERMITTENT CONDITIONS  under SELF-DIAGNOSTIC SYSTEM. If no, go to next step.
  5. Perform the Fuel Return System Diagnosis. See appropriate SYSTEM & COMPONENT TESTING article. Did you find and correct the condition? If yes, go to step  7. If no, go to next step.
  6. Replace the FRP regulator. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. After repairs, go to next step.
  7. 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.
  8. 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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