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Engine Controls - Tests W/Codes Expand All (for easy ctrl-f) Collapse All Introduction Self-Diagnostic System Diagnostic Flow Charts Diagnostic Code Charts Code 13, Oxygen Sensor Circuit Open Circuit Code 14, Coolant Temperature Sensor (Cts) Circuit Low Temperature Indicated Code 15, Coolant Temperature Sensor (Cts) Circuit High Temperature Indicated Code 21, Throttle Position Sensor (TPS) Circuit Signal Voltage High Code 22, Throttle Position Sensor (TPS) Circuit Signal Voltage Low Code 23, Manifold Air Temperature (Mat) Sensor Circuit Low Temperature Indicated Code 25, Manifold Air Temperature (Mat) Sensor Circuit High Temperature Indicated Code 31, Manifold Absolute Pressure (Map) Sensor Circuit Signal Voltage High - Low Vacuum Code 32, Manifold Absolute Pressure (Map) Sensor Circuit Signal Voltage Low - High Vacuum Code 41, Ignition Signal Circuit No Signal Code 42, 5TH Gear Switch Circuit Grounded Circuit M/T Only) Code 42, Torque Converter Clutch Lock-Up Signal Circuit Signal Voltage Remains On At All Times (A/T Only) Code 44, Idle Switch Circuit Open Or MISADJUSTED Code 45, Idle Switch Circuit Circuit Grounded Or MISADJUSTED Code 51, EGR System & Exhaust Gas Recirculated Temperature EGRTS) Temperature Too Low Or Too High (CALIF. Only) Code 53, Ground Circuit Open (CALIF. Only) Summary