The final step in any diagnosis and repair is a quality control check to confirm that the original customer complaint has been corrected and that the system is functioning normally. In the case of the engine electronic control system, the Quality Control Check should consist of the following items:
• Clear any stored diagnostic codes.
• Confirm closed loop operation.
• Confirm normal air/fuel ratio calibration.
• Confirm codes do not reset.
Three of these confirmations can be performed using the VF terminal of the check connector.
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