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Sera diagnostics

If your check engine light comes on, it means one of the sensors has detected a fault, or there is a fault with a sensor. 

With a bent metal paper clip, bridging terminals T1/TE1 and E1 on the diagnostics socket near the dashboard, the engine warning light will flash a code which can be looked up to see what fault has occurred.

Check the image below – click for full size.

Check the positions of T1/TE1  and E1 on the underside of the lid of the diagnostics port, the graphic below relates to another model of Toyota.