Mixed Deck — All CPT Topics Flashcards

When should assessment & evaluation be conducted in Certified Performance Technician?

Answer: At regular intervals and whenever significant changes occur

Regular assessments combined with trigger-based reviews ensure ongoing monitoring while capturing the impact of significant changes.

What is the PRIMARY purpose of documentation & reporting in Certified Performance Technician?

Answer: To provide accurate, accessible information for decision-making and compliance

Data and documentation exist primarily to provide accurate, accessible information that supports both decision-making and regulatory compliance.

A performance modification that removes the EGR system on a street-driven vehicle in the US will most directly cause what regulatory issue?

Answer: A federal emissions tampering violation under the Clean Air Act, subject to fines, and the vehicle will fail OBD-II readiness checks for EGR monitoring

Removing an OEM emission control device violates the Clean Air Act's tampering provisions and will trigger OBD-II faults as EGR monitors fail to complete.

Which data parameter is MOST useful for identifying knock (detonation) events during performance testing?

Answer: Knock sensor retard counts or ignition timing pull

Knock sensor retard data directly shows how much timing the ECU is pulling to protect against detonation events.

Why is the firing order of an engine important for performance technicians?

Answer: It ensures that power strokes are evenly spaced to minimize vibration and heat buildup in adjacent cylinders

The firing order is engineered to distribute power strokes evenly around the crankshaft and prevent adjacent cylinders from firing consecutively, which reduces vibration and avoids heat concentration in one area of the engine.

What factor MOST affects the validity of assessment & evaluation outcomes in Certified Performance Technician?

Answer: The consistency and appropriateness of assessment methods used

Validity depends primarily on using consistent, appropriate methods that actually measure what they are intended to measure.

When reviewing dyno pull data, a technician sees consistent power loss at the same RPM point across multiple runs. What should be investigated first?

Answer: A repeatable event such as fuel cut, ignition retard, or shift point activation at that RPM

A consistent power loss at the same RPM across multiple runs points to a programmed event such as a rev limiter, fuel cut, or timing pull triggering at that point.

A parasitic draw test is performed to identify:

Answer: Excessive battery drain

A parasitic draw test is conducted to measure the amount of electrical current being drawn from the battery when the vehicle is turned off and all systems should be inactive. An excessive parasitic draw indicates that a component or circuit is continuously consuming power, even when not in use. This slow, continuous drain can lead to a dead battery over time, preventing the vehicle from starting.

Under US EPA regulations, what is the primary purpose of the On-Board Diagnostics II (OBD-II) system in relation to emissions?

Answer: To continuously monitor emission-related components and alert the driver via the MIL when thresholds are exceeded

OBD-II continuously monitors emission-related systems and illuminates the MIL when a fault could cause emissions to exceed 1.5 times the applicable standard.

How should technology & tools upgrades be managed in a Certified Performance Technician environment?

Answer: Through a structured change management process with testing and rollback plans

A structured change management process with testing and rollback plans minimizes risk and ensures upgrades do not disrupt operations.

In Certified Performance Technician, which technology & tools practice BEST ensures system reliability?

Answer: Implementing redundancy, regular testing, and documented recovery procedures

Redundancy, regular testing, and documented recovery procedures create a robust environment that minimizes downtime and data loss.

What is the primary function of the Evaporative Emission Control (EVAP) system on modern US vehicles?

Answer: To capture fuel vapors from the tank and purge them into the intake for combustion rather than releasing them to the atmosphere

The EVAP system uses a charcoal canister to capture fuel vapors from the fuel tank and purges them through the intake manifold for combustion, preventing HC emissions.

Which tool is most commonly used to measure system vibration levels?

Answer: Vibration analyzer

A vibration analyzer is a specialized tool specifically designed to detect, measure, and analyze vibration levels in machinery. It helps technicians identify mechanical issues such as imbalances, misalignments, loose components, or bearing faults that cause excessive vibration. While other tools measure different parameters, the vibration analyzer provides precise data for diagnosing these specific problems.

Which barrier MOST commonly hinders effective communication & collaboration in Certified Performance Technician?

Answer: Lack of active listening and assumptions about understanding

Failure to actively listen and making assumptions about understanding are the most common barriers to effective communication.

Which of the following is used to analyze exhaust emissions?

Answer: Exhaust gas analyzer

An exhaust gas analyzer is a specialized diagnostic tool used to measure the concentration of various gases in a vehicle's exhaust emissions, such as hydrocarbons, carbon monoxide, and nitrogen oxides. This analysis helps technicians identify issues with combustion efficiency, catalytic converter performance, and overall engine health. It is crucial for emissions testing and fine-tuning engine performance.

What is the primary purpose of performance testing in a mechanical system?

Answer: To validate system efficiency and output

The primary purpose of performance testing in a mechanical system is to objectively measure and validate its efficiency, output, and overall operational effectiveness. This process ensures that the system meets its design specifications, operates optimally under various conditions, and delivers the expected results. It helps identify any deviations from desired performance and areas for improvement.

What is typically the first step in diagnosing engine performance issues?

Answer: Read diagnostic codes

When diagnosing engine performance issues, the initial and most crucial step is typically to connect a scan tool to the vehicle's OBD-II port and read any stored diagnostic trouble codes (DTCs). These codes provide specific information about detected malfunctions, guiding the technician towards the problematic system or component. This first step significantly streamlines the diagnostic process.

On a data log, a technician observes that throttle position is at 100% but MAP sensor reads only 9 psi on a naturally aspirated engine. What does this suggest?

Answer: A restriction in the intake tract reducing volumetric efficiency

On a NA engine at WOT, MAP should approach atmospheric pressure (~14.7 psi); a low MAP indicates an intake restriction reducing cylinder filling.

In Certified Performance Technician, how does core principles & fundamentals contribute to professional credibility?

Answer: By demonstrating competence, maintaining standards, and delivering consistent results

Professional credibility is built through demonstrated competence, consistent adherence to standards, and reliable delivery of quality results.

What is the role of a relay in an electrical circuit?

Answer: Act as a switch for high current

A relay acts as an electromagnetic switch, allowing a low-current signal to control a high-current circuit. This protects sensitive switches from high electrical loads and enables the activation of powerful components, like starter motors or headlights, with a smaller, less robust control switch. The low current energizes a coil, which then closes contacts to complete the high-current path.