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Engine Controls - Tests W/Codes Expand All (for easy ctrl-f) Collapse All Introduction Self-Diagnostic System Diagnostic Code Charts (Standard Emissions) Notes On-Board Diagnostic (OBD) System Check (Standard Emissions) Chart A1-1 (Standard Emissions) - No Malfunction Indicator (Mil) On Steady Chart A1-2 (Standard Emissions) - Won't Flash Any Codes, Or (Mil) On Steady Code 13 (Standard Emissions) - Oxygen Sensor, Signal Voltage Does Not Change Code 14 (Standard Emissions) - Engine Coolant Temperature Sensor, Low Temperature Indicated Code 15 (Standard Emissions) - Engine Coolant Temperature Sensor, High Temperature Indicated Code 21 (Standard Emissions) - Throttle Position (TP) Sensor, Signal Voltage High Code 22 (Standard Emissions) - Throttle Position (TP) Sensor, Signal Voltage Low Code 23 (Standard Emissions) - Intake Air Temperature Sensor, Low Temperature Indicated Code 24 (Standard Emissions) - Vehicle Speed Sensor Code 25 (Standard Emissions) - Intake Air Temperature Sensor, High Temperature Indicated Code 31 (Standard Emissions) - Manifold Absolute Pressure Sensor, Low Voltage - Low Vacuum Code 32 (Standard Emissions) - Manifold Absolute Pressure Sensor, High Voltage - High Vacuum Code 41 (Standard Emissions) - Ignition Signal Circuit Code 42 (Standard Emissions) - Camshaft Position Sensor Circuit, No Signal For 2 Seconds Code 51 (Standard Emissions) - Exhaust Gas RECIRCULATION Diagnostic Code Charts (Upgraded Emissions) Notes On-Board Diagnostic (OBD) System Check (Upgraded Emissions) Chart A2-1 (Upgraded Emissions) - No Malfunction Indicator Light (Mil) Chart A2-2 (Upgraded Emissions) - Won't Flash Any Codes, Or (Mil) On Steady Code 13 (Upgraded Emissions) - Heated Oxygen Sensor, Signal Voltage Does Not Change Code 14 (Upgraded Emissions) - Engine Coolant Temperature Sensor, Low Temperature Indicated Code 15 (Upgraded Emissions) - Engine Coolant Temperature Sensor, High Temperature Indicated Code 21 (Upgraded Emissions) - Throttle Position Sensor, Signal Voltage High Code 22 (Upgraded Emissions) - Throttle Position Sensor, Signal Voltage Low Code 23 (Upgraded Emissions) - Intake Air Temperature Sensor, Low Temperature Indicated Code 24 (Upgraded Emissions) - Vehicle Speed Sensor Code 25 (Upgraded Emissions) - Intake Air Temperature Sensor, High Temperature Indicated Code 31 (Upgraded Emissions) - Manifold Absolute Pressure Sensor, Low Voltage - Low Vacuum Code 32 (Upgraded Emissions) - Manifold Absolute Pressure Sensor, High Voltage - High Vacuum Code 41 (Upgraded Emissions) - No Ignition Signal Code 42 (Upgraded Emissions) - Camshaft Position Sensor, No Signal For 2 Seconds Code 46, (Upgraded Emissions) - Idle Speed Control Motor Code 51 (Upgraded Emissions) - Exhaust Gas RECIRCULATION Summary