Mixed Deck — All GM Topics Flashcards

A GM technician performs a leak test on an AC system using which preferred method per current GM service procedures?

Answer: Electronic refrigerant leak detector or UV dye with UV lamp

GM recommends using an electronic refrigerant leak detector or ultraviolet dye with a UV lamp to precisely locate leaks, as these methods can detect small leaks accurately.

What is the significance of documentation in Transmission and Drivetrain?

Answer: It provides a record for accountability, quality assurance, and legal compliance

Proper documentation supports accountability, enables quality review, and satisfies legal requirements.

What are the key regulatory requirements affecting Diagnostic Technology?

Answer: Compliance with applicable laws, industry standards, and licensing requirements specific to the field

Practitioners must comply with all applicable regulations, which may include federal, state, and industry-specific requirements.

What additional benefit often comes with a GM Approved Pre-Owned vehicle?

Answer: Extended warranty coverage

A significant additional benefit that often comes with a GM Approved Pre-Owned vehicle is extended warranty coverage. This warranty provides an extra layer of protection beyond any remaining factory warranty, covering major components and offering peace of mind to the buyer. It's a key differentiator that adds value and reduces potential ownership risks compared to standard used cars.

What role does continuing education play in Engine Systems?

Answer: Keeping practitioners current with evolving best practices and new developments

Continuing education ensures practitioners stay current with advances in their field.

Which GM system monitors fuel trim values to diagnose fuel delivery issues?

Answer: Powertrain Control Module (PCM)

The PCM continuously monitors short-term and long-term fuel trim values to adjust the air/fuel mixture and detect deviations that indicate fuel system faults.

Before opening a GM AC system for service, a technician must first perform which step?

Answer: Recover all refrigerant using a certified recovery machine

EPA regulations require all refrigerant to be recovered with certified recovery equipment before opening any part of the AC system to prevent atmospheric release.

On GM vehicles equipped with rear HVAC, where is the secondary expansion device typically located?

Answer: At the rear HVAC module under the rear cargo area or rear of the passenger compartment

The rear HVAC module contains its own expansion device (orifice tube or TXV) located within the rear heating/cooling unit, separate from the front system's expansion device.

When replacing a GM airbag inflator, technicians must follow which critical safety step first?

Answer: Disable the supplemental restraint system (SRS) and wait the specified time

Technicians must disable the SRS and wait the manufacturer-specified time (typically 1–3 minutes) to allow capacitors to discharge before handling airbag components.

Which approach is most effective for problem-solving in Engine Systems?

Answer: Systematic analysis followed by evidence-based decision making

Systematic, evidence-based approaches lead to more reliable solutions than ad hoc methods.

What quality metrics are most important in Electrical Systems?

Answer: Measurable outcomes, process compliance, and stakeholder satisfaction

Quality in Electrical Systems is measured through multiple dimensions including outcomes, processes, and satisfaction.

What is the typical PAG oil specification concern when servicing a GM system that has been converted from R-134a to R-1234yf?

Answer: R-1234yf requires PAG oil with a specific viscosity grade approved for use with that refrigerant — do not mix with R-134a PAG oil

R-1234yf systems require PAG oil certified compatible with R-1234yf; using R-134a-grade PAG oil can cause compatibility issues and void warranty on system components.

What is the primary purpose of the GM Direct Injection (GDI) fuel system compared to port fuel injection?

Answer: Inject fuel directly into the combustion chamber at high pressure for improved efficiency

GDI injects fuel directly into the combustion chamber at pressures up to 2,900 psi, enabling better fuel atomization, improved thermal efficiency, and reduced emissions.

What role does continuing education play in Transmission and Drivetrain?

Answer: Keeping practitioners current with evolving best practices and new developments

Continuing education ensures practitioners stay current with advances in their field.

What is the primary purpose of standardized procedures in Electrical Systems?

Answer: To ensure consistency, safety, and quality across all practitioners

Standardized procedures ensure that all practitioners deliver consistent, safe, and high-quality outcomes.

What makes a professional competent in Electrical Systems?

Answer: A combination of education, practical experience, ongoing learning, and adherence to professional standards

Competence requires the integration of knowledge, skills, experience, and professional conduct.

What does the acronym ADAS stand for in GM vehicles?

Answer: Advanced Driver Assistance Systems

ADAS stands for Advanced Driver Assistance Systems, which encompasses technologies like automatic emergency braking and lane keep assist.

What is the most important foundational concept in Engine Systems?

Answer: Understanding core principles and their practical application in Engine Systems

Core principles provide the foundation for all decision-making and practice in Engine Systems.

What tool might GM provide to accredited dealerships to enhance customer experience?

Answer: Customer relationship management (CRM) systems tailored to GM standards

GM often provides accredited dealerships with advanced tools like Customer Relationship Management (CRM) systems tailored to GM standards. These systems help dealerships manage customer interactions, track service history, and personalize communications, thereby enhancing the overall customer experience. By streamlining processes and improving customer engagement, these tools contribute to higher satisfaction and loyalty.

What is the function of GM's Lane Keep Assist (LKA) system?

Answer: Alerts the driver with a vibration when drifting and can apply corrective steering torque

Lane Keep Assist provides a steering wheel vibration alert when unintentional lane departure is detected and can apply gentle corrective steering torque to guide the vehicle back.