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Question 1
While diagnosing a rough idle on a vehicle equipped with an Electronic Fuel Injection (EFI) system, a technician connects an oscilloscope to a magnetic inductive crankshaft position (CKP) sensor. What waveform pattern should be observed on the screen as the engine runs?
Correct Answer:
An analog sine wave with amplitude and frequency that increase as engine speed increases
Question 2
A vehicle retrieves Diagnostic Trouble Code (DTC) P0171 (System Too Lean - Bank 1). The technician notes that the Short-Term Fuel Trim (STFT) is +18% at idle, but decreases to +2% at 2,500 RPM. What is the most likely cause of this condition?
Correct Answer:
A vacuum leak in the intake manifold downstream of the MAF sensor
Question 3
An oscilloscope is connected to a fuel injector ground control circuit. While monitoring the waveform, the technician observes that the injector pulse width is 1.8 milliseconds (ms) at normal idle, but increases to 12 ms when the throttle is snapped wide open. What does this change indicate?
Correct Answer:
Normal PCM operation providing enrichment during rapid acceleration
Question 4
A technician is testing a three-wire Throttle Position Sensor (TPS). With the ignition switch ON (engine off), the voltmeter connected to the signal wire shows 0.5V at closed throttle and sweep-tests smoothly up to 4.5V at wide-open throttle (WOT). How should the technician evaluate these readings?
Correct Answer:
The sensor is operating normally and is within typical specifications
Question 5
An Engine Coolant Temperature (ECT) sensor has a Negative Temperature Coefficient (NTC). How will the sensor's electrical resistance change as the engine warms up from a cold start to normal operating temperature?
Correct Answer:
The resistance will drop significantly as the temperature rises
Question 1
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About this Exam

Prepare with the Automotive Servicing NC III Practice Questions - TESDA Automotive Servicing NC III Competency Assessment Exam practice quiz. This question bank includes 100 questions covering technician, vehicle, engine, cause, and transmission. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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Automotive Servicing NC III Practice Questions - TESDA Automotive Servicing NC III Competency Assessment Exam

This practice set contains 100 questions from the matching question bank and focuses on technician, vehicle, engine, cause, and transmission. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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