Using Scan Tools to Read OBD-II Codes
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Objective
I can use a scan tool to connect to the DLC, retrieve specific DTCs, and determine the readiness status of OBD-II monitors.
Part 1 of 4
Warm-up video
1A Auto: Repair Tips & Secrets Only Mechanics Know · 3:03
We don't generate video — this one is by 1A Auto: Repair Tips & Secrets Only Mechanics Know on YouTube. The practice questions and exit ticket below were drafted by AI for this objective, and every question is editable in the teacher guide.
Part 2 of 4
Key concepts
3 concepts
- 1
When the battery is disconnected, all monitors are cleared, which can affect emission inspections.
- 2
A scan tool can be used to check if the monitors are ready before going to a shop for a state inspection.
- 3
The DLC connector is typically located underneath the driver's side and is used to connect the scan tool to the car's computer.
Part 3 of 4
Practice
11 questions
What is the primary function of OBD-II monitors?
Where is the DLC connector typically located in most cars?
Part 4 of 4
Exit ticket
Quick comprehension check
“Using a scan tool, connect to the DLC of a car with the ignition on. After the scan tool has checked the monitors, what information is displayed regarding DTCs, the number of completed readiness monitors, and the number of non-completed readiness monitors?”
Sample answer included in the free materials
Get the materials
Teacher guide, student handout, and slides — free, in Google Docs format
Teacher Guide
Complete lesson plan with answer keys and alternate activities
Student Handout
Printable worksheet
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