ECU and EEPROM Programming 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 ECU and EEPROM Programming flashcards as text
When an automotive ECU is described as 'virginized,' what has been done to it?
Answer: All vehicle-specific data has been erased, returning it to an unprogrammed factory state
Virginizing an ECU erases all vehicle-specific data from its EEPROM, returning it to an unprogrammed factory state ready for fresh programming.
Which vehicle manufacturer uses the 'Motorola HC05' or 'HC11' microcontroller family, commonly found in older ECU EEPROM programming scenarios?
Answer: General Motors vehicles from the 1990s–2000s
General Motors widely used Motorola HC05 and HC11 microcontrollers in their ECUs from the 1990s through the early 2000s.
A customer's Toyota has a locked ECU due to failed key programming attempts. Which approach is most appropriate?
Answer: Perform an EEPROM dump to extract and reset the attempt counter, then retry programming
Performing an EEPROM dump to locate and reset the attempt counter is the professional approach to recovering from a locked ECU state.
What is the significance of the 'seed and key' algorithm in ECU security systems?
Answer: It is a challenge-response authentication mechanism used to grant programming access to the ECU
The seed-and-key algorithm is a challenge-response security mechanism where the ECU sends a random 'seed' and requires a calculated 'key' response before allowing programming access.
When desoldering an EEPROM chip for off-board programming, which technique minimizes the risk of PCB damage?
Answer: Using hot air rework station with appropriate temperature and airflow settings
A hot air rework station with properly calibrated temperature and airflow settings provides even heating that minimizes the risk of PCB trace or component damage.
What does the term 'key learning' mean in the context of immobilizer EEPROM data?
Answer: The process of storing a new transponder's crypto value into the ECU or immobilizer EEPROM
Key learning is the process of writing a new transponder's cryptographic identity into the ECU or immobilizer module's EEPROM so it is recognized as valid.
Which of the following EEPROM chip sizes is most commonly encountered in automotive immobilizer modules?
Answer: 93C46 (64 bytes)
The 93C46 with 64 bytes of storage is among the most commonly encountered EEPROM sizes in automotive immobilizer and BCM applications.