13 Oxygen (O2) Sensor – signal stays low (“lean”) during warm engine cruise
14 Coolant Temperature Sensor (CTS) – signal voltage is low
15 Coolant Temperature Sensor (CTS) – signal voltage is high
16 High battery voltage
OR Direct Ignition System (DIS) fault – line open or shorted to ground
17 RPM signal problem
21 Throttle Position Sensor (TPS) – signal voltage is high during engine idle or deceleration
22 Throttle Position Sensor (TPS) – signal voltage is low during engine idle
OR Fuel cutoff relay circuit – open or shorted to ground
23 Manifold Air Temperature (MAT) Sensor – signal voltage is low
OR Throttle Position Sensor (TPS) error
24 Vehicle Speed Sensor (VSS) – signal is constant (no pulsing) during engine deceleration Continue reading “ECM Error Codes”