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Home >> Pontiac >> 1985 >> 1000 4D Hatchback, Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> Adjustment >> Tune-Up - 1.6L/98" Gas 2BBL In-Line 4 VIN [C] >> Computerized Engine Control System >> A-Chart Identification/Availability

A-Chart Identification/Availability

The following table lists only those A-charts available for this engine, as well as their identifications.

The A-charts are used to find and repair problems which the Diagnostic Circuit Check has found. If the initial steps in the Diagnostic Circuit Check reveal a problem, or if the engine does not start, you will be using one or more A-charts for diagnosis. Consider them the "fundamental problem" charts.

These charts are not contained in this article. They can be found in the appropriate article in the ENGINE PERFORMANCE section.

A-CHART IDENTIFICATION/AVAILABILITY

Chart Identification/Purpose
A-2 Dwell Fixed Between 10° and 50° (Open Coolant or Oxygen Sensor Circuit)
A-3 Dwell Fixed Over 50° (Rich Exhaust Indication)
A-4 "Check Engine" Light Inoperative
A-5 "Check Engine" Light ON At All Times or Won't Flash Code 12