Assessment and Evaluation Flashcards

A misfire code P0302 follows the ignition coil when it is swapped to cylinder 3. What has been confirmed?

Answer: The ignition coil is faulty

When the misfire moves with the coil, the coil itself is the cause.

Before condemning a mass airflow sensor, what should the technician evaluate?

Answer: Intake leaks, the air filter condition, and MAF readings compared to specifications

Unmetered air or restrictions can skew MAF readings, so check them before replacing the sensor.

What is the purpose of a readiness code check before a US emissions inspection?

Answer: To verify the OBD monitors have completed their self-tests

Emissions programs need the OBD-II monitors to show complete, which proves the system has tested itself.

A carbon buildup problem is suspected on the intake valves of a direct-injection TSI engine. What is the best evaluation method?

Answer: Inspect the valves with a borescope through the intake ports

A borescope shows the actual carbon deposits on the back of the intake valves.

While evaluating a customer's no-start concern, the technician finds that the immobilizer is active in ODIS. What is the next logical step?

Answer: Check the key's recognition and immobilizer status in the relevant control module

An active immobilizer blocks starting, so check key recognition and immobilizer status before anything else.

When evaluating a timing chain stretch concern on an EA888 engine, which data is commonly used?

Answer: Camshaft-to-crankshaft phase deviation (the camshaft adjustment measured value)

The phase deviation between the camshaft and crankshaft in measured values shows how far the chain has stretched against the limit.

After a repair, why should the technician recheck all control modules for fault codes?

Answer: To find new or related faults set during the repair before delivery

Disconnecting components can set new codes, so a final scan makes sure the car leaves fault-free.