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1992 - 1993 Corvette: ECM Codes

Code #12:  Normal No Codes.
Code #13:  Left Oxygen Sensor Circuit.
Code #14:  Coolant Temperature Sensor Circuit High.
Code #15:  Coolant Temperature Sensor Circuit Low.
Code #16:  Opti-Spark Ignition Timing System.( Low Pulse)
Code #21:  Throttle Position Sensor Circuit High.
Code #22:  Throttle Position Sensor Circuit Low.
Code #23:  Intake Air Temperature Sensor Circuit Low.
Code #24:  Vehicle Speed Sensor Circuit.
Code #25:  Intake Temperature Sensor Circuit High.
Code #26:  Quad-Driver Module #1 Circuit.
Code #27:  Quad-Driver Module #2 Circuit.
Code #28:  Quad-Driver Module #3 Circuit.
Code #32:  Exhaust Gas Recirclation Circuit.
Code #33:  Manifold Absolute Pressure Sensor Circuit Low.
Code #34:  Manifold Absolute Pressure Sensor Circuit High.
Code #36:  Opti-Spark Ignition Timing System. (High Resolution Pulse.)
Code #41:  Electronic Spark Timing Circuit Open.
Code #42:  Electronic Spark Timing Circuit Grounded.
Code# 43:  Electronic Spark Control Circuit.
Code #44:  Left Oxygen Sensor Circuit Lean.
Code #45:  Left Oxygen Sensor Circuit Rich.
Code #51:  Mem-Cal Error.
Code #52:  Engine Oil Temperature Sensor Circuit Low.
Code #53:  System Voltage.
Code #55:  Fuel Lean Monitor.
Code #56:  Vacuum Sensor Circuit.
Code #61:  Secondary Port Throttle Valve System.
Code #62:  Engine Oil Temperature Sensor Circuit High.
Code #63:  Right Oxygen Sensor Circuit Open.
Code #64:  Right Oxygen Sensor Circuit Lean.
Code #65:  Right Oxygen Sensor Circuit Rich.
Code #66:  A/C Pressure Sensor Circuit Open.
Code #67:  A/C Pressure Sensor Circuit. (Sensor or A/C Clutch Circuit Problem)
Code #68:  A/C Relay Circuit Shorted.
Code #69:  A/C Clutch Circuit.
Code #72:  Gear Selector Switch Circuit.

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