6.0 Located the ECT sensor on vehicle.
6.1 With the engine not ruining, back probe a likely wire for the ECT supply by inserting a pin down the rubber insulation enough to connect with the metal wire terminal on the inside. Setup the voltmeter to read DC Volts.
6.2 Make sure all students and meter leads are clear of the engine. Turn the ignition "ON", but do not start the engine.
6.3 Record the reading from the meter: 1.55 V If you not get a reading on the meter, you may have to check for a good connection or try different wires until get a good reading to record above.
6.4 Is the engine cold, between cold and normal temperature (warming up) or at normal operating temperature? warm.
6.5 Does the voltage reading above seem right for the temperature of the engine? (yes or no) YES.
6.6 Make sure all students and meter leads are real of the engine. Start the engine.Left the engine warm up for abut two more minutes, and record the voltage of the ECT sensor now: 0.95 V
6.7 A warmer engine should usually show a lower voltage. Is the reading above lower than the first reading? (yes or no): YES
6.8 Di scribe how an ECT sensor works.
When the engine warm up the voltage drops, this is a variable resistor as the temperature rises the resistance decrease as we read an the meter the voltage drop according ohms law V=IR
6.9 Describe how the ECT sensor voltage affects the fuel injection output from the ECU.
As the temperature of the engine increase the voltage and resistance drops. The signal to the computer indicates there is less fuel demand and less fuel will be consumed.
6.10 Describe what could go wrong to create an incorrect voltage for the ECU:
If it is give wrong signal to computer, so the computer will give wrong guidance for fuel, according to the signal there for the engine will run rich or lean.
7.0 Ground Coolant Temperature Sensor
7.1 Located the ground or earth wire:
7.2 Back probe the sensor ground or earth wire by inserting a pin down the rubber insulation far enough to connect with metal wire terminal on the inside. Hook up the multimeter red lead to DC volt. Set the meter scale to 4 v or less. Make sure the meter black lead is grounded on engine block or battery.
7.3 Start the engine.
7.4 Record the voltage on the meter: 0.03 V (A good ground will usually read less than 0.05v. Some manufacturers say 0.10v)
6.11 Draw the circuit diagram for the ECT sensor for this vehicle. Include some detail inside the ECU.
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