Where is the engine reset button on a 2001 yaris 1.3

run fault codes and look for an ambient temp sensor fault.

Low power:
1. Spark plugs.
2. Fuel pump control circuit.
3. Ignition system.
4. Injectors.
5. Mass air flow sensor.
6. Variable valve timing system.
7. Engine compression.
8. Back pressure.

EOBD II Error Code: P0117
Fault Location:
Engine Coolant Temperature (ECT) Sensor (G62) - Low Input
Possible Cause:
Malfunction Indicator Lamp (MIL) Triggered on first occurrence.
Coolant thermostat.
Wiring short to earth.
Engine coolant temperature (ECT) sensor.

EOBD II Error Code: P0340
Fault Location:
Camshaft Position (CMP) Sensor A (G40), Bank 1 - Circuit Malfunction
Possible Cause:
Malfunction Indicator Lamp (MIL) active.
Wiring from/to Camshaft Position Sensor (CMP) faulty.
Camshaft position (CMP) sensor faulty.
Timing misaligned.
Possible Solutions:
Check Wiring from/to Camshaft Position Sensor.
Check Camshaft Position Sensor.
Check Timing.

EOBD II Error Code: P0500
Fault Location:
Vehicle Speed Sensor (VSS) - Circuit Malfunction
Possible Cause:
Malfunction Indicator Lamp (MIL) Non Emission Fault - No warning light.
Wiring.
Vehicle speed sensor (VSS).
Engine control module (ECM).

That the temperature gauge,you engine is cold,and goes off when the engine is warm and at its optimal performance temperature,now if it goes red when your driving then thats a warning its overheating,

The blue light stays on till the engine is cold. It goes off when the engine warms up. It is normal phenomena.

Instructions

1. • 1 Insert the key into the ignition. Turn the switch to the "On" position.
     
   • 2 Press the odometer reset button repeatedly until "Trip A" is displayed.
     
   • 3 Turn the ignition to the "OFF" position.
     
   • 4 Press and hold the odometer reset button. Turn the ignition switch to the "ON" position.
     
   • 5 Release the odometer reset button after the indicator displays "000000." The maintenance service light turns off.
     

Read more: How to Reset the Maintenance Service Light on a Toyota Yaris ' eHow.com http://www.ehow.com/how_7211378_reset-service-light-toyota-yaris.html#ixzz1QfXJpIaWI do hope you meant the maintenance required light and NOT the check engine light as you said.

Check your owner's manual. Then try the other button? This is a new car, though. Try disconnecting the negative battery terminal for about 15-minutes to reset 'all'.

You can take the car to autozone and ask them to run a test. When they are done ask them If you can clear the code. You have to do it because they are not allowed. You just have hit erase and confirm.

Turn the key on.

Observe the odometer

Is it displaying ODO/total miles traveled? If not, depress the trip reset button until ODO is displayed

Key off

Press & hold the trip reset button, keep pressing it until advised to release it.

Key on

Observe the odometer display

you should see 5 dashes, then 4, then 3, then 2, then 1, and then 5 zeros, and then the mileage you started with.

Release the button.

You are done,

If you do NOT see 5 dashes, 4-3-2-1, set the trip meter to "trip 'A'"
and retry as instructed above. Some Toyotas use either method.

its possible u may have done some damage to engine