Code #12: Normal No Codes.
       Code #13: Open Oxygen Sensor Circuit.
       Code #14: Coolant Sensor Circuit Low.
       Code #15: Coolant Sensor Circuit High.
       Code #21: Throttle Position Sensor High.
       Code #22: Throttle Position Sensor Low.
       Code #23: Manifold Air Temperature Circuit High.
       Code #24: Vehicle Speed Sensor.
       Code #25: Manifold Air Temperature Circuit Low.
       Code #32: EGR System Failure.
       Code #33: Mass Air Flow Sensor High.
       Code #34: Mass Air Flow Sensor Low.
       Code #36: Mas Air Flow Sensor Burn-Off Function Fault.
       Code #41: Cylinder Select Error.
       Code #42: Electronic Spark Timing.
       Code #43: Electronic Spark Control.
       Code #44: Lean Exhaust indication.
       Code #45: Rich Exhaust Indication.
       Code #46: Vehicle Anti Theft Fault.
       Code #51: Faulty Mem-Cal.
       Code #52: Fuel Calpak Missing.
       Code #52: (1990-91 Corvette Only): Engine Oil Temperature Sensor Low.
       Code #53: System Over Voltage.
       Code #54: Fuel Pump Circuit Low Voltage.
       Code #55: Defective ECM.
       Code #62: Engine Oil Temperature Sensor Circuit High.