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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, Check Engine Light On At All Times, Will Not Flash Code 12 Code 13, Oxygen Sensor Circuit Open Circuit 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 Sensor CKT, Low Temp Indicated Code 24, Vehicle Speed Sensor (VSS) Circuit Code 25, Intake Air Temp Sensor CKT, High Temp Indicated Code 31, Map Sensor Circuit, Signal Voltage High - Low Vacuum Code 32, Map Sensor Circuit, Signal Voltage Low - High Vacuum Code 41, Ignition Signal Circuit, No Signal Code 42, Crank Angle Sensor Circuit, No Signal For 3 Seconds Code 44, Idle Switch Circuit, Open Circuit Or MISADJUSTED TPS Code 45, Idle Switch CKT, CKT Grounded Or MISADJUSTED TPS Code 51, EGR System & EGR Temp Sensor (EGRTS) CKT, Temp Too Low Or Too High (CALIF. Only) Code 53, Ground Circuit Open (CALIF. Only)