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Engine Controls - Tests W/Codes Expand All (for easy ctrl-f) Collapse All Introduction Self-Diagnostic System Diagnostic Tests Notes Code 13, Open Oxygen Sensor Circuit Code 14, Coolant Temperature Sensor Signal Voltage Low Code 15, Coolant Temperature Sensor Signal Voltage High Code 21, Throttle Position Sensor Signal Voltage High Code 22, Throttle Position Sensor Signal Voltage Low Code 23, Mat Sensor Signal Voltage High Code 24, Vehicle Speed Sensor (VSS) Code 25, (IAT) Mat Sensor Signal Voltage Low Code 33, Map Sensor Signal Voltage High Code 34, Map Sensor Signal Voltage Low Code 41, Cylinder Select Error Code 42, Est Circuit Open Or Grounded Code 43, ESC Error Without ESC Module Code 44, Lean Exhaust Indication Code 45, Rich Exhaust Indication Code 46, Pass-Key System Code 51, Faulty Prom/Mem-Cal Code 52, Low Engine Oil Temperature Code 53, System OVERVOLTAGE Code 54, Fuel Pump Voltage Low Code 62, High Engine Oil Temperature