ASE4 Computerized Engine Controls 3

Question 1

When using a scan tool to monitor freeze frame data, the technician can determine:

Accepted Answer

The engine operating conditions at the moment a fault code was set

Answer

The exact cause of the fault code

Answer

Which sensor failed based on voltage readings

Answer

The repair procedure for the stored code

Question 2

A knock sensor DTC is set and the engine has excessive spark retard. The knock sensor circuit tests good. The NEXT step is to:

Accepted Answer

Check for carbon deposits causing actual detonation

Answer

Replace the knock sensor

Answer

Listen for actual detonation under load with a stethoscope

Answer

Replace the ECM

Question 3

The VVT (Variable Valve Timing) system uses which parameter to control camshaft advance?

Accepted Answer

Oil pressure delivered via ECM-controlled solenoids

Answer

Throttle position and coolant temperature

Answer

Ignition timing angle

Answer

MAF sensor grams per second

Question 4

A P0016 code (Crankshaft/Camshaft Correlation Bank 1, Sensor A) is stored. This indicates:

Accepted Answer

The camshaft is not in the expected position relative to the crankshaft

Answer

The crankshaft position sensor is faulty

Answer

The timing chain has broken

Answer

The CMP sensor is shorted

Question 5

What is the purpose of the ECM's adaptive fuel strategy (long-term fuel trim)?

Accepted Answer

To learn and compensate for long-term changes in engine components

Answer

To improve cold-start enrichment

Answer

To adjust fuel delivery only during acceleration

Answer

To replace the oxygen sensor's role in fuel control

Question 6

A vehicle communication fault occurs when connecting the scan tool. The FIRST thing to verify is:

Accepted Answer

Battery voltage and the integrity of the DLC (Data Link Connector) power and ground circuits

Answer

Whether the ECM needs reprogramming

Answer

The scan tool software version

Answer

Whether the CAN bus has a fault code