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Engine Controls - Tests W/Codes Expand All (for easy ctrl-f) Collapse All Introduction Self-Diagnostic System Diagnostic Code Charts Notes Diagnostic Circuit Check Chart A-1, No Malfunction Indicator Light (Mil) Chart A-2, Wont Flash Code 12 Or Any Codes, Mil On Steady Code 13, Heated Oxygen Sensor Circuit, Open Circuit Code 14, ECT Sensor Circuit, Low Temperature Indicated Code 15, ECT Sensor Circuit, High Temperature Indicated Code 21, TP Sensor Circuit, Signal Voltage High Code 22, TP Sensor Circuit, Signal Voltage Low Code 23, IAT Sensor Circuit, Low Temperature Indicated Code 24, Vehicle Speed Sensor (VSS) Circuit Code 25, IAT Sensor Circuit, High Temperature Indicated Code 31, Map Sensor Circuit, High Voltage Input - High Vacuum Code 32, Map Sensor Circuit, Low Voltage Input - Low Vacuum Code 41, Ignition Signal Circuit, No Signal (1 Of 2) Code 42, Camshaft Position Sens CKT, No Signal For 2 Seconds Code 44, Idle Switch Circuit, Open Circuit Or MISADJUSTED Code 45, Idle Switch Circuit, Circuit Grounded Or MISADJUSTED Code 51, EGR Circuit (CALIF. Only) Code 53, Ground Circuit, Circuit Open (CALIF. Only) Summary