DTC: ECT-123 Diagnostic Socket A2
Engine Coolant Temperature Sensor Code
The diagnostic trouble code EFI-123 is stored in the Engine Control Unit (ECU). The code, if set will be in diagnostic socket A2. A code will be set if the signal received at the ECU is below -44 C or above 148 C. When the engine is started a theoretical temperature is assumed and once that temperature reaches 75 C it is compared to the actual reading from the ECT. If the ECT temperature is lower than 58 C the code will be set. Should the code be set idle air trim adaptation is disabled, long-term fuel trim is disabled, leakage diagnostics is disabled and initial boost pressure is adopted. Replacement of the sensor can be done by following the instructions for replacing the thermostat. If you haven't replaced your thermostat in 60K or notice that it takes a while for the temp gauge to get to the 3:00 position, you might want to replace it while you are doing the ECT sensor.
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