Toyota Corolla (E170): If a warning light turns on or a warning buzzer sounds

Calmly perform the following actions if any of the warning lights comes on or flashes. If a light comes on or flashes, but then goes off, this does not necessarily indicate a malfunction in the system. However, if this continues to occur, have the vehicle inspected by your Toyota dealer.

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System description
The ecm uses the signals from the throttle position sensor, air–flow meter and crankshaft position sensor to monitor the engagement condition of the lock–up clutch. Then the ecm compares the engagement condition of the lock–up clutch with the lock–up schedule in the ecm memory to de ...

Monitor description
While the engine is being cranked, the battery positive voltage is applied to terminal sta of the ecm. If the ecm detects the starter control signal (sta) while the vehicle is driving, it will conclude that there is a fault in the starter control circuit. The ecm will turn on the mil and a d ...

Inspection procedure
1 Input signal check See input signal check on page 05–745. check indicator light operation when driving with vehicle speed above 40 km/h (25 mph), and with vehicle speed below 40 km/h (25 mph). Ok: vehicle speed above 40 km/h (25 mph): indicator light blinks vehicle speed be ...