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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 351 (Engine Controls Self-Diagnostics - 2.2L Bi-Fuel) >> Self-Diagnostic System >> Diagnostic System Check - Engine Controls (Alternative Fuels) >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
  1. Install a scan tool. Does the scan tool turn ON? If yes, go to next step. If no, see SCAN TOOL DOES NOT POWER UP under SYSTEM TESTS in appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  2. Attempt to establish communication with the listed control modules. If you are using a Tech 2, obtain the information with the Class 2 MESSAGE MONITOR feature:
    • The Instrument Panel Cluster (IPC)
    • The Powertrain Control Module (PCM)
    • Body Control Module (BCM)

    Does the scan tool communicate with all the listed control modules? If yes, go to next step. If no, go to SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS in appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.

  3. Verify the vehicle is operating on CNG. Attempt to start the engine. Does the engine start and idle? If yes, go to next step. If no, go to DTC P1204: VEHICLE DOES NOT OPERATE IN CNG MODE  under DIAGNOSTIC TESTS.
  4. Select the DTC display function for the following control modules:
    • The Body Control Module (BCM).
    • The Electronic Brake Control Module (EBCM).
    • The Instrument Panel Cluster (IPC).
    • The Powertrain Control Module (PCM).
    • The HVAC module.

    Does the scan tool display any DTCs? If yes, go to next step. If no, go to step  9.

  5. Using a scan tool, select CAPTURED INFO to store the powertrain DTC information. Did you complete the action? If yes, go to next step.
  6. Does the scan tool display DTCs which begin with a "U"? If yes, go to SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS in appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT. If no, go to next step.
  7. Were any of the PCM DTCs P0601, P0602, P1209 or P1621 set? If yes, perform appropriate diagnostic procedure. Go to DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, go to next step.
  8. Does the scan tool display DTC P0562, P0563, P0621 or P0622? If yes, see appropriate GENERATORS & REGULATORS article in STARTING & CHARGING SYSTEMS. If no, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS .
  9. Start and idle the engine. Force a switch over to gasoline operation with the scan tool in the SPECIAL FUNCTIONS, OUTPUT CONTROLS menu. Does the engine continue to idle? If yes, go to next step. If no, go to next step.
  10. Is the customer's concern with the Transmission? If yes, see appropriate DIAGNOSIS article in AUTOMATIC TRANSMISSIONS. If no, go to next step.
  11. Is the customer's concern with the Inspection/Maintenance (I/M) testing? If yes, go to INSPECTION/MAINTENANCE SYSTEM CHECK  under DRIVE CYCLES. If no, go to next step.
  12. If the customer's concern is a MIL related symptom, refer to appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. Repair as necessary. Did you complete the action? If yes, system is okay. If no, problem is intermittent. See INTERMITTENTS in TROUBLE SHOOTING - 2.2L CAVALIER - BI-FUEL - CNG/GASOLINE article.
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