Make Ford Model KA 1100cc Year 2003
1.0 Locate Oxygen Sensor
1.1 Locate oxygen sensor on your vehicle. Describe it is located:
The oxygen sensor located above inlet manifold in this vehicle.
1.2 How many wires for this sensor? 4 wires.
1.3 Record the colors for each of the wires at the sensor side of the connector. Then list the use of the wires.
Color Use or Purpose
white Heater supply
Black Signal
Grey Sensor ground
White Heater ground
1.4 What type of Oxygen Sensor is this? Titania switching sensor.
2.0 Back probe the Oxygen Signal Wire with a pin and connected to an oscilloscope.
Run the engine and check that you are seeing a signal Connected OK? Yes connect OK
3.0 Watch and record Oxygen Signal pattern at 2500 rpm.Let the engine warm up and enter close loop so see a normal cylinder pattern.
3.1 Freeze your pattern and draw or photo graph.
3.2 How high does the voltage go? 0.95 V
3.3 How low does the voltage go? 0.19 V
3.4 What is the average voltage? (Some oscilloscopes have function that calculate the average for you . If not, just guess.) 0.5 V.
3.5 How many "Cross Count" does the signal have in 10 seconds? from low to high or high to low.
3.4
3.6 If the signal is not cycling normally , describe what the signal does:
It may go to negative (-0.2 v) on the graph.
Watch and Record Oxygen Signal pattern at idle rpm. you may have to hold the rpm abut 2500 for half minute to go into closed loop. Then let the RPM come down to idle.
4.3 How low does the voltage go? 0.5 volt
4.4 What is the average voltage? 0.4 V
4.5 How many "Cross Counts" does the signal have in 10 seconds? 14
4.6 If the signal is not cycling normally, describe what the signal does?
These may have negative pattern on the graph (- 0.2 V)
5.0 Make this Oxygen Sensor go rich by accelerating once or twice. Push on the accelerator quickly . The signal should go over 0.85 V.
5.1 Freeze the pattern as it goes rich photograph.
5.3 If the signal is not going high normally , describe what signal does: It will have very low voltage and it will be lower than 1.0 volt.
6.0 Make this Oxygen Sensor go lean by doing sudden deceleraton. Gently run the rpm to about 3000 , and let the rpm drop suddenly. The fuel system should make the system go lean on deceleration. The signal should go below 0.2 V
6.1 Freeze your pattern as it goes rich .
6.1 How low does the oxygen sensor voltage go? 0.015 V
6.2 If this signal is not going low normally , describe what the signal does:
The signal will be above zero volt.
7.0 Measure the Response Time of the sensor. freeze the pattern and measure how long it took the sensor to go from lean to reach.
7.1 freeze your pattern as it goes suddenly rich from a lean condition and draw it into the graph below . Normally you want the voltage to go from below 0.2 V to above 0.8V. In less than 100 ms .
7.2 Measure how long the sensor took to go from lean to rich. Use the sensors coursers on the scope if necessary. Record how long the sensor took here: 40 ms
8.0 Discusses how a normal Zirconium oxygen sensor works: draw a picture below to help show how it works?
Zirconium oxygen sensor has two electrodes which provide an output voltage corresponding to the quality of oxygen in the exhaust in relation to the atmosphere. The output of 0.2 V represent a lean mixture.
9.0 Discuss how good or bad this oxygen sensor is. What about it function well or is faulty? Use detail and specific voltage in your discussion. Can it accuratelly tell the ECU how rich or lean the exhaust is?
This sensor elements the rich - lean cycling allowing the control unit to adjust the fuel delivery and ignition timing of the engine much more rapidly, but less sensitive to either rich or lean. 0.2 volts represent lean and 1 volt represent rich mixture.
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