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Engine Controls - Tests W/Codes Expand All (for easy ctrl-f) Collapse All Introduction Self-Diagnostic System DIAGNOSTIC CODE CHARTS (EXCEPT LSi) Notes Diagnostic Circuit Check Chart A1-1, No Malfunction Indicator Light Chart A1-2, Mil Won't Flash Any Codes, On Steady Code 12, No Rpm Signal Code 13, No Rpm Signal Code 14, Ignition Signal Circuit, No Signal Code 21, Oxygen Sensor Circuit, Open Or Shorted Circuit Code 22, Engine Coolant Temp Sensor, Open Or Shorted CKT Code 24, IAT Sensor Circuit, Open Or Shorted Circuit Code 25, O2 Sensor Circuit, Lean Exhaust Indicated Code 26, Oxygen Sensor Circuit, Rich Exhaust Indicated Code 27, Sub-O2 Sens CKT, Open Or Shorted CKT (Ca EMIS Only) Code 31, Map Sensor, Open Or Shorted Circuit Code 41, TP Sensor Circuit, Open Or Shorted Circuit Code 42, Vehicle Speed Sensor CKT, Open Or Shorted CKT Code 43, Crank Signal, No Signal Code 51, Switch Condition Signal Code 71, Exhaust Gas RECIRCULATION (EGR) SYS (Ca Emissions) (VIN 8) CODE CHARTS (PRIZM LSi) Diagnostic Circuit Check Chart A2-1, No Malfunction Indicator Light (Mil) Chart A2-2, Mil Won't Flash Any Codes, On Steady Code 12, No Rpm Signal Code 13, No Rpm Signal Code 14, Ignition Signal Circuit, No Signal Code 16, Pcm Control Signal, Pcm Failure Code 21, Oxygen Sensor Circuit, Open Or Shorted Circuit Code 22, Engine Coolant Temp Sensor, Open Or Shorted CKT Code 24, IAT Sensor Circuit, Open Or Shorted Circuit Code 25, O2 Sensor CKT, Lean Exhaust Indicated Code 26, O2 Sensor CKT, Rich Exhaust Indicated Code 27, Sub-O2 Sens CKT, Open Or Shorted CKT (Ca Emissions) Code 31, Map Sensor, Open Or Shorted Circuit Code 41, TP Sensor Circuit, Open Or Shorted Circuit Code 42, Vehicle Speed Sensor CKT, Open Or Shorted CKT Code 43, Crank Signal, No Signal Code 51, Switch Condition Signal Code 52, Knock Sensor Circuit, Open Or Shorted Circuit Code 71, EGR System (CALIF Emissions Only) Summary