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Home >> Chevrolet >> 1984 >> S10 Blazer 2.8 B, RWD, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> 1.9L CEC Tests W/Codes >> Description >> Diagnostic Circuit Check - Basic Procedures

Diagnostic Circuit Check - Basic Procedures

  1. Ensure all engine systems NOT related to the system are fully operational. DO NOT  proceed with testing unless all other problems have been corrected. Ensure that all electrical and vacuum connections are correct and in good condition.
  2. Enter diagnostic mode and record trouble codes flashed by "CHECK ENGINE" lamp. Exit diagnostic mode.
  3. Distinguish between "hard" and "intermittent" trouble codes.
  4. If trouble codes were displayed, go to DIAGNOSTIC CIRCUIT CHECK CHART. Follow instructions given there.
  5. If no trouble codes were recorded, go to DRIVER COMPLAINT CHECK CHART and follow instructions given there.
  6. After any repairs are made, perform SYSTEM PERFORMANCE CHECK. Clear any trouble codes.
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