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Brigham Young University, Idaho *

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131

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Mechanical Engineering

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Oct 30, 2023

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AUTO 131 — Voltmeter Diagnosis Instructions: Use the diagram to answer the following questions. Assume you are using a voltmeter to complete the diagnostic tests. Scenario: The back-up lights do not come on when the gear selector is placed in reverse. You will use a voltmeter to complete your diagnostic tests. Keep in mind that if an electrical component isn’t working (in this case, either lightbulb), the problem must be in the bulb itself, or one of the wires connecting to the bulb has the wrong voltage. 1. Identify which points in the diagram you would connect the voltmeter leads to in order to determine if the problem is with the bulb, the power side, or the ground side of the circuit. The ignition switch to the On position and the gear selector to the Reverse position. How would you test whether the problem is with the bulb? I would place a voltmeter between and , and it should provide a reading of approximately __12.6_ volts. What does it indicate if the voltmeter matches your predicted voltage? It would show that the battery is charged How would you test whether the problem is with the power side of the circuit? I would place a voltmeter between and , and it should provide a reading of approximately _12.6__ volts. What does it indicate if the voltmeter matches your predicted voltage? That the power side is not the cause of issue How would you test whether the problem is with the ground side I would place a voltmeter between and , and it should provide a reading of approximately __12.6_ volts.

of the circuit? What does it indicate if the voltmeter matches your predicted voltage? That the ground side is not the cause 2. With the ignition switch turned On and the transmission in Reverse, the voltmeter is placed between point N and point O , and it provides a reading of 2.4 volts. Remember that you have already tested the power side of the circuit, and it is in spec. What does this reading indicate? There is unwanted resistance in the line somewhere, either on the negative side or the positive side 3. Consider the results from testing the reverse light bulbs and answer the following question. Why do they not illuminate when placing the gear selector in reverse? A faulty component or loose connection 4. To identify the faulty component, the voltmeter will be used between several points in the circuit. The ignition switch is in the On position and the gear selector is in the Reverse position. Complete the following chart with the values the voltmeter should return with the leads at those points. Red Lead Point Black Lead Point Expected Voltage Point M Point P __12.6__ volts Point O Point P __12.6__ volts 5. With the ignition switch turned On and the transmission in Reverse, the voltmeter is placed between point O and point P , and it provides a reading of 9.8 volts. Which component has failed? The wire could have failed, or the splice. You could narrow the issue down by testing M to P to see if it is the shared portion. Along with that you could test this with a bypass, just to make sure that the wire from O to P has failed. 6. Identify which electrical problem has occurred. Which of the three types of electrical problems has occurred? This electrical problem is interesting because it is not a completely open circuit because the load is getting voltage, 2.4 volts, just not enough to illuminate the bulb. I believe this is an example of unwanted resistance.

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