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Engine Controls - Tests W/Codes Expand All (for easy ctrl-f) Collapse All Introduction Self-Diagnostic System Summary Diagnostic Code Charts Notes Diagnostic Circuit Check Chart A-1, No "Check Engine" Light Chart A-2, Won't Flash Code 12/Check Engine Light On Steady Code 13, Oxygen Sensor Circuit, Signal Voltage Doesn't Change Code 14, Coolant Temp Sensor (Cts) CKT, Low Temp. Indicated Code 15, Coolant Temp Sensor (Cts) CKT, High Temp Indicated Code 21, Throttle Position Sensor CKT, Signal Voltage High Code 22, Throttle Position Sensor CKT, Signal Voltage Low CODE 23, INTAKE AIR TEMP (IAT) SENSOR CkT, LOW TEMP INDICATED Code 24, Vehicle Speed Sensor Circuit Code 25, Intake Air Temp Sensor CKT, High Temp Indicated Code 31, Map Sensor CKT, Low Voltage Input - Low Vacuum Code 32, Map Sensor Circuit, High Voltage Input - High Vacuum Code 41, Ignition Signal Circuit, No Signal Code 42, Crank Angle Sensor Circuit, No Signal For 3 Seconds Code 51, Exhaust Gas RECIRCULATION (EGR) Circuit