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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 (Except GSI) Notes Diagnostic Circuit Check Chart A-1, No Check Engine Light Chart A-2, Check Engine Light Won't Flash, On All The Time Codes 12 &/Or 13, No Rpm Signal, No Signal For 2 Seconds Code 14, Ignition Signal Circuit, No Signal Code 21, Oxygen Sensor Circuit, Open Or Shorted Circuit Code 22, Coolant Temperature Sensor, Open Or Shorted Circuit Code 24, Intake Air Temp Sensor CKT, Open Or Shorted CKT Code 25, Oxygen Sensor Circuit Lean Exhaust Indicated Code 26, Oxygen Sensor Circuit Rich Exhaust Indicated Code 31, Map Sensor, Open Or Shorted Circuit Code 41, Throttle Switch Circuit Code 42, Vehicle Speed Sensor Circuit Code 43, No Crank Signal From Starter Code 51, Switch Condition Signal Code 71, EGR Temperature Sensor Circuit (CALIF. Only) Diagnostic Code Charts (GSI) Notes Diagnostic Circuit Check Chart A-1, No Check Engine Light Chart A-2, Check Engine Light, Won't Flash, On All The Time Codes 12 &/Or 13, No Rpm Signal, No Signal For 2 Seconds Code 14, Ignition Signal Circuit, No Signal Code 21, Oxygen Sensor Circuit Open Or Short Circuit (CALIF.) Code 21, Oxygen Sensor CKT Open Or Short CKT (Federal) Code 22, Coolant Temp Sensor (Cts) CKT, Open Or Shorted CKT Code 24, Intake Air Temp (IAT) Sensor CKT, Open Or Shorted Code 25, Oxygen Sensor Circuit, Lean Exhaust Indicated Code 26, Oxygen Sensor Circuit, Rich Exhaust Indicated Code 27, Sub-Oxygen Sensor CKT, Open Or Shorted CKT (CALIF.) Code 31, Mass Airflow Sensor, Short Circuit Code 41, Throttle Position Sensor (TPS), Open Or Short CKT Code 42, Vehicle Speed Sensor Circuit Code 43, No Crank Signal, No Signal From Starter Code 51, Switch Condition Signal Code 52, Knock Sensor Signal, Open Or Short Circuit Code 53, Knock Control Signal, Faulty ECM Code 71, EGR Temperature Sensor Circuit (CALIF. Only)