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Home >> Chevrolet >> 2003 >> Cavalier Base, 4D Sedan, L61/KL6 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics - 2.2L Bi-Fuel >> Self-Diagnostic System >> Diagnostic Starting Point - Engine Controls

Diagnostic Starting Point - Engine Controls

Begin the system diagnosis with the Diagnostic System Check - Engine Controls (Alternative Fuels). See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS (ALTERNATIVE FUELS) . The use of the Diagnostic System Check - Engine Controls will identify the correct procedure for diagnosing the system and where the procedure is located. The Diagnostic System Check - Engine Controls will provide the following information:

  1. The identification of the control modules which command the system.
  2. The ability of the control modules to communicate through the serial data circuit.
  3. The identification of any stored Diagnostic Trouble Codes (DTCs) and the status of the codes.

Ensure all engine systems not related to computer system are operating properly. DO NOT proceed with testing unless all other problems have been repaired. Diagnostic system check must be performed before using specific DTC testing procedure. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS (ALTERNATIVE FUELS) .

If no DTCs are present and a driveability problem exists, refer to SYMPTOMS in TROUBLE SHOOTING - NO CODES - 2.2L CAVALIER - BI-FUEL - CNG/GASOLINE article. Doing so will help identify proper system or component to check in TROUBLE SHOOTING - NO CODES - 2.2L CAVALIER - BI-FUEL - CNG/GASOLINE article.

After necessary repairs are made, clear DTCs, verify vehicle will enter "closed loop" operation and ensure DTC does not reset.

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