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Engine Controls - Tests W/Codes Expand All (for easy ctrl-f) Collapse All Introduction Self-Diagnostic System PRIZM GSi CODE CHARTS (VIN 5) Diagnostic Circuit Check Chart A1, No Check Engine Light Diagnostic Aids Chart A2, Check Engine Light Won't Flash On Steady Codes 12 & 13, No Rpm Signal/No Signal For 2 Seconds Code 14, IGN Signal Circuit/No Signal Code 21, O2 Sensor Circuit/Open Or Short Circuit Code 22, Coolant Temp Sensor/Open Or Short Circuit Code 24, Intake Air Temp Sensor CKT/Low Temp Indicated Code 25, O2 Circuit/Lean Exhaust Indicated Code 26, O2 Sensor Circuit/Rich Exhaust Indicated Code 27, Sub-O2 Sensor/Open Or Shorted CKT (CALIF. Only) Code 31, Mass Airflow Sensor/Short Circuit Code 41, Throttle Position Sensor/Open Or Short Circuit Code 42, Vehicle Speed Sensor (VSS) Circuit Code 43, No Crank Signal From Starter Code 51, No A/C Signal Code 52, Knock Sensor Signal/Open Or Short CKT Code 53, Knock Control Signal/Faulty ECM Code 71, EGR Gas Temp Sensor CKT (CALIFORNIA Only) PRIZM EXCEPT GSi CODE CHARTS (VIN 6) Diagnostic Circuit Check Chart A1, No Check Engine Light Diagnostic Aids Chart A2, Check Engine Light Won't Flash On Steady Codes 12 & 13, No Rpm Signal/No Signal For 2 Seconds Code 14, IGN Signal CKT, Open Or Short CKT Code 21, O2 Sensor CKT/Open Or Short CKT Code 22, Coolant Temp Sensor CKT/Open Or Shorted CKT Code 24, Intake Air Temp Sensor CKT/Low Temp Indicated Code 25, O2 CKT/Lean Exhaust Indicated Code 26, O2 Sensor CKT/Rich Exhaust Indicated Code 31, Map Sensor/Open Or Short CKT Code 41, Throttle Switch Circuit Code 42, Vehicle Speed Sensor Circuit Code 43, No Crank Signal From Starter Code 51, No A/C Signal Code 71, EGR Gas Temp Sensor CKT (CALIFORNIA Only) Summary