The ECU codes are displayed as pulses of the Check Engine Light. If they have not been used before they are usually taped quite high up & can be difficult to find, but they are there, once untaped they dangle down and are quite easy to use. The connectors are located under the dash up by the steering column. When the ECU has been reset the Check Engine Light will flashĪs indicated above, the Black Read Memory Connectors & the Green Test mode Connectors are required to perform diagnostic & ECU resets.Until warm (don't push it and take it easy like a grandpa!) If no fault is detected - drive the car sensible for a couple of minutes.If a fault is detected - Check ECU Code.Then return it to the half-throttle position and hold it there for two seconds.Connect Read Memory Connectors & Test Mode Connectors.It is possible to reset the ECU by following steps: Note that on the early Subaru models (especially pre 1997) the ECU purposely retards the ignition when any knock is detected, however, and it takes its time to advance the timing again. This will remove any stored fault codes and restore ignition advance. If there is a fault Check Appropriate SensorĪn ECU reset will restore the car to factory default settings.Turn ignition OFF & Disconnect Connectors.If Code is OK then Turn ignition OFF & Disconnect Connectors.(scroll down to "Finding Those Connectors" section to help you locate them) It is possible to find which sensor(s) is faulty by following these steps:
ECU DIAGNOSTICS DRIVER
The ECU will then signal the driver via the Check Engine in the instrument console if there is a problem with any of the computers inputs. The stock ECU on a 92-97 Subaru Impreza can diagnose any fault that may arise that are sent from the various sensors in the engine bay to the electronic controller unit (ECU). All the details below would hep anyone Diagnose when their Check Engine light stays one and geared towards WRX, STI owners. All the below information is for the first generation Subaru Impreza, which is the pre-facelift model covering years from 1992 to 1997.