ALOA CMAL Practice Questions - ALOA Certified Master Automotive Locksmith (CMAL) - Top Automotive Credential Exam - ALOA CMAL Practice Questions - ALOA Certified Master Automotive Locksmith (CMAL)

Question 1

In the ISO 11898 CAN bus standard, what is the dominant voltage differential between CAN-High and CAN-Low on a typical high-speed automotive bus?

Approximately 5V (CAN-H ~5V, CAN-L ~0V) Approximately 2V (CAN-H ~3.5V, CAN-L ~1.5V) Approximately 12V (matches vehicle battery) 0V (both lines at 2.5V)

Correct Answer:

Approximately 2V (CAN-H ~3.5V, CAN-L ~1.5V)

Question 2

Which ISO standard defines Unified Diagnostic Services (UDS) used by modern OEMs for secured key programming?

ISO 11784 (RFID) ISO 15765 / ISO 14229 (UDS) ISO 9141-2 ISO 14230 (KWP2000)

Correct Answer:

ISO 15765 / ISO 14229 (UDS)

Question 3

A K-line (ISO 9141/KWP2000) diagnostic interface operates at what logical voltage level idle?

Battery voltage (~12V) idle, pulled low to transmit 3.3V LVTTL 5V TTL 0V (ground)

Correct Answer:

Battery voltage (~12V) idle, pulled low to transmit

Question 4

On OBD-II (J1962) connectors, which pins carry high-speed CAN?

Pins 6 and 14 (CAN-H and CAN-L) Pins 7 and 15 (K-line and L-line) Pins 2 and 10 (SAE J1850) Pins 4 and 5 (chassis/signal ground)

Correct Answer:

Pins 6 and 14 (CAN-H and CAN-L)

Question 5

What is a 'gateway module' in a modern vehicle network, and why does it matter to a locksmith?

A central ECU that routes messages between sub-buses and may block unauthenticated diagnostic access A Wi-Fi bridge to the infotainment unit The ECU that validates tire pressure sensor data A physical anti-theft lock on the OBD port

Correct Answer:

A central ECU that routes messages between sub-buses and may block unauthenticated diagnostic access

Question 1

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Prepare with the ALOA CMAL Practice Questions - ALOA Certified Master Automotive Locksmith (CMAL) - Top Automotive Credential Exam practice quiz. This question bank includes 100 questions covering immobilizer, vehicles, cmal, eeprom, and programming. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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ALOA CMAL Practice Questions - ALOA Certified Master Automotive Locksmith (CMAL) - Top Automotive Credential Exam

This practice set contains 100 questions from the matching question bank and focuses on immobilizer, vehicles, cmal, eeprom, and programming. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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ALOA CMAL Practice Questions - ALOA Certified Master Automotive Locksmith (CMAL) - Top Automotive Credential Exam

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