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Engine Controls - Tests W/Codes Expand All (for easy ctrl-f) Collapse All Introduction Self-Diagnostic System Diagnostic Code Charts Diagnostic Circuit Check Chart A-1, No Check Engine Light Diagnostic Aids Chart A-2, Won't Flash Code 12 Check Engine Light On Steady Code 13, O2 Sensor Circuit Signal Voltage Doesn't Change Code 14, Coolant Temp. Circuit Low Temp. Indicated Code 15, Coolant Temp. Sensor Circuit High Temp. Indicated Code 21, Throttle Switch Circuit (M/T Only) Idle Switch & Wot Switch Indicated On Code 21, Throttle Position Sensor Circuit (A/T) Signal Voltage High Code 22, Throttle Position Sensor Circuit (A/T) Signal Voltage Low Code 23, Intake Air Temp Sensor Circuit Low Temp Indicated Code 24, Vehicle Speed Sensor Circuit Code 25, Intake Air Temp Sensor Circuit High Temp Indicated Code 31, Map Sensor CKT Signal Voltage Low W/High Vacuum Code 32, Map Sensor CKT Signal Voltage High W/Low Vacuum CODE 41, IGNITION SIGNAL CKT, LSi STD IGN W/VAC ADVANCE CODE 41, IGN SIGNAL CKT NO SIGNAL, XFi W/ESC IGN SYSTEM CODE 42, CRANK ANGLE SENSOR CKT NO SIGNAL FOR 2 SEC. XFi W/ESA IGNITION CODE 51, EGR CIRCUIT (CALIFORNIA & XFi ONLY) Summary