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1985 - 1991 Corvette: ECM Codes

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:  Mass 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.

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