ecu fault code check

Switch ignition on but don't start the engine. In the grey plug under the fuse box, connect the two right pins (chk and ign) with a paper clip for example, for 3 seconds (the engine check light will turn off while you are shorting them out). The engine check light will flash a series which will indicate a code -
Long long long long long (pause) Short short short short short - indicates 55 which is no fault.

If it flashes 3 long and 4 short for example it's the Det sensor.

To clear the ECU codes, short the wires out again while it is flashing the code.