ASE L1 Test Prep: BUS circuit testing on The Type 3 Composite Vehicle

ASE L1 Test Prep: BUS circuit testing on The Type 3 Composite Vehicle

The Advanced Engine

The Advanced Engine ­Performance Specialist (L1) test contains 50 scored questions focused on the diagnosis of general powertrain, computerized powertrain controls (including OBD II), ignition systems, fuel and air induction systems, emission control systems and I/M test failures.
 Section B of the Task List on computerized powertrain controls states that you should be able to perform the following items on circuits:
• Voltage Drop
• Current Flow
• Continuity/Resistance
• Waveform Analysis
Many of the circuit testing questions relate to a sample vehicle using a composite ­powertrain control system featuring computerized engine control technology used by most manufacturers. This vehicle is described in the Composite Vehicle Type 3 Reference Booklet that is provided both before and at the time of testing.
The Type 3 vehicle was introduced in 2006. This vehicle has several serial data buses and multiple modules. There will be question on the test concerning how different conditions like shorts, opens and changes in resistance can alter serial data bus traffic. You also have to be able to understand the test results from voltage drop, resistance and scope analysis.
Most of all you need to understand how a serial data bus network shares information by just changing voltages over two wires.
Good luck!

You May Also Like

GSP Releases New CV Axle Part Numbers

GSP said 14 new CV axle part numbers are in stock and ready to ship.

GSP released 14 new CV axle part numbers. These parts are compatible with select Chevy, Chrysler, Subaru, BMW, Land Rover, Dodge and Hyundai vehicles.

The parts are in stock and ready to ship. Visit for more information.

Nissan CVT Clutch Point Relearn Procedure

The Adaptive Shift Control delivers responsive and powerful acceleration.

Diagnostic Test Drive For Drivetrain

A driveshaft center bearing can fail due to the bearing and the rubber isolator.

Constant-Velocity Axle Options

Whether new or remanufactured, complete CV axle assemblies can throw you a curveball from time to time.

10 Timing Belt Tips

Here are the some key installation and service tips to make your next timing belt job just a little easier.

Other Posts

BCA Bearings Unveils 2024 Endless Summer Promotion

The Endless Summer promotion runs from May 1 through June 30, 2024.

PRT Launches 30 New Complete Strut Assemblies

The new items represent more than 10 million vehicles in new coverage, PRT said.

RNR Tire Express Hosts Mother’s Day Giveaway

The eighth-annual event promises $100,000 in prizes, as well as a brand new 2024 Buick Encore for one select nominee.

Brand Refresh for Tires Plus, Hibdon Tires Plus Begins

Logo updates include a single-color tire mark; a logo palette comprised of Tires Plus yellow, black and red; and refined typefaces.