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Engine Controls - Tests W/Codes Expand All (for easy ctrl-f) Collapse All Introduction Self-Diagnostic System Diagnostic Code Charts Notes Diagnostic Circuit Check Chart A-1, No Malfunction Indicator Light (Mil) Chart A-2, Won't Flash Code 12, Or Any Codes, Mil On Steady Code 13, Oxygen Sensor CKT, Signal Voltage Does Not Change Code 14, ECT Sensor CKT, Low Temperature Indicated Code 15, ECT Sensor Circuit, High Temperature Indicated Code 21, TP Sensor CKT, Signal Voltage High Code 22, TP Sensor Circuit, Signal Voltage Low Code 23, IAT Sensor Circuit, Low Temperature Indicate Code 24, Vehicle Speed Sensor Circuit Code 25, IAT Sensor Circuit, High Temperature Indicated Code 31, Map Sensor Circuit, Low Voltage Input - Low Vacuum Code 32, Map Sensor Circuit, High Voltage Input - High Vacuum Code 41, Ignition Signal Circuit, No Signal Code 42, Camshaft Position Sens CKT, No Signal For 2 Seconds Code 51, Exhaust Gas RECIRCULATION (EGR) Circuit Summary