Ignition System Servicing Flashcards
7 cards from real CAL practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Ignition System Servicing flashcards as text
What does OBD-II programming of a transponder key involve in terms of the locksmith's connection to the vehicle?
Answer: Connecting a programmer to the 16-pin OBD-II port under the dashboard to communicate with the vehicle's ECU
OBD-II programming uses a specialized tool plugged into the standardized 16-pin diagnostic port, which provides access to the ECU or BCM for writing transponder key codes.
A locksmith observes that an ignition keyway has significant wear and causes keys to bind. What is the recommended service solution?
Answer: Replace the ignition cylinder with a new or refurbished unit and rekey to the existing key
A worn keyway compromises security and smooth operation; replacing the cylinder with a rekeyed unit restores proper function without requiring the customer to get all-new keys.
When a locksmith uses an 'all-keys-lost' procedure on a modern vehicle, what is a critical prerequisite before programming new keys?
Answer: The vehicle battery must be fully charged or a battery support unit must be connected
Programming procedures draw significant power and communicate with sensitive ECUs; low voltage during programming can corrupt module data or cause incomplete key writes.
Which term describes the bitting specification that a manufacturer assigns to each key blank, indicating the maximum and minimum cut depths and their increments?
Answer: Depth and space specification
Depth and space specifications define the exact dimensions (depths and spacing between cuts) a manufacturer uses for a key series, ensuring cuts fall within tolerances the lock can operate.
A customer's push-to-start vehicle won't recognize the smart key fob near the start button. After confirming the fob battery is good, what should the locksmith check next?
Answer: Whether the fob is programmed/paired to the vehicle's PKE (Passive Keyless Entry) system
Smart fobs must be paired to the vehicle's Passive Keyless Entry system; a replacement or unprogrammed fob will not be recognized by the antenna array even with a fresh battery.
When should a locksmith use a key gauge or depth gauge during ignition servicing?
Answer: To verify that a cut key's depths match the required specification before attempting to use it in the cylinder
A key gauge allows the locksmith to precisely measure each cut depth on a newly cut key, confirming it matches the target bitting before risking damage to the lock or the key.
Which professional practice best protects a locksmith when performing ignition work on a vehicle that a customer claims ownership of?
Answer: Asking the customer to sign a work authorization form and verifying their ID against the vehicle registration or title
Documenting customer identity, vehicle ownership, and obtaining signed authorization protects the locksmith legally and establishes a clear chain of consent for the work performed.