03_Pressure Transducer Testing

An absolute pressure transducer measures pressure relative to atmospheric pressure.*

True
False

Which of the following best describes the function of a piezoelectric pressure sensor?*

It uses a diaphragm to measure the difference between two pressures.
It generates voltage when pressure is applied to a crystal element.
It requires atmospheric pressure as a reference.
It converts vacuum into differential pressure.

Technician A says in-cylinder pressure waveforms can identify valve timing events. Technician B says a traditional compression gauge can reveal intake valve closing. Who is correct?*

Technician A only
Technician B only
Both Technician A and B
Neither Technician A nor B

The compression tower on an in-cylinder waveform represents the piston reaching TDC on the compression stroke.*

True
False

Which of the following is MOST likely indicated if the waveform shows a flat exhaust plateau with no distinct release event?*

Early intake valve closing
Worn crankshaft reluctor teeth
Exhaust valve not opening
Late ignition timing

Which conditions can be diagnosed using in-cylinder pressure waveform analysis? (Check all that apply)*

Ignition coil resistance
Retarded intake camshaft timing
Worn camshaft lobes
Exhaust restriction

On a typical non-VVT engine, the intake valve closing (IVC) occurs approximately:*

90° ABDC
590° crankshaft rotation
5–16° ATDC
40–50° BBDC

Waveform overlays allow technicians to compare a suspect cylinder against a known good reference to identify timing differences.*

True
False

Technician A says ignition timing measured on a scan tool always reflects actual timing inside the cylinder. Technician B says ignition timing must be confirmed by comparing ignition traces to the compression waveform. Who is correct?*

Technician A only
Technician B only
Both Technician A and B
Neither Technician A nor B

Which waveform feature indicates valve overlap?*

Compression tower
Exhaust plateau
Intake valley
The transition between exhaust closing and intake opening

Which of the following are limitations of traditional cranking compression tests? (Check all that apply)*

Cannot detect camshaft timing shifts
Cannot reveal exhaust restrictions
Cannot measure peak cylinder pressure
Cannot show valve overlap

During testing, a cylinder shows normal compression at idle but the measured compression drops significantly at higher RPM, while other cylinders remain stable. Which is the most likely cause?*

Retarded camshaft timing
Worn intake rocker arm or cam lobe
Crankshaft reluctor misalignment
Exhaust valve not opening

Ignition events occurring at or after TDC may be normal for turbocharged GDI engines to prevent knock.*

True
False

Technician A says injector timing can be observed in in-cylinder waveforms. Technician B says injector timing strategies are identical for MPI and GDI systems. Who is correct?*

Technician A only
Technician B only
Both Technician A and B
Neither Technician A nor B

If a waveform shows the intake valley missing entirely, what is the most likely cause?*

Late ignition timing
Intake valve not opening
Excessive valve overlap
Exhaust restriction

Please provide us with your email address in order to receive your test results and certificate of completion.*

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Pressure Transducer Testing – 4 Hours

Course Evaluation