DIESEL & HEAVY-DUTY DIAGNOSTIC TRAINING

Don’t guess the part.
Prove the fault.

Use simulated meters on heavy-duty circuits. Follow the evidence, find the fault and verify your repair.

No signup · No payment · Works on your phone.

The actual No-Crank workspace: a 12 V battery, diesel engine, labelled starter relay, red and black probes and a live 6.74 V voltage-drop reading. — Real simulator. Live readings. You choose the test.Start with the guided work-lamp circuit, then work up to a truck that won’t crank.

THINK LIKE A DIAGNOSTIC TECH

A complaint. A test. Proof.

01Read the complaint
02Choose a test
03Use the tool
04Prove the fault
05Verify the repair

The first circuit guides you through a lamp that won’t light. Make your own measurements and see your result before you create an account.

A WORKSHOP YOU CAN OPEN ANYWHERE

There’s a lot to put to the test.

Progressive circuits: 30
Fault variantsAcross 23 work-order families: 74
Practical lessons: 50
Sensor families: 16
Skill levelsPlus independent exam practice: 6

Build the method.
Then test your skills.

Place probes. Compare measurements. Inspect the wiring. Choose a repair and check that it solves the original complaint.

Read the electrical practice guides →

Multimeter & circuit diagnosisSupply, return paths, open circuits and voltage drop.
SensorsMagnetic pickups, Hall effect and temperature sensors.
Starting & chargingWork through the No-Crank case and starter, battery and charging work orders.
CAN / J1939Generic network fundamentals and fault finding.
Skill & Red Seal-style practiceIndependent assessments and answer reviews to target your next practice.

START FREE. KEEP PRACTISING.

Free to try. Free to save.

Play the first guided circuit without an account. All current training is free. Create an account to save your results, XP and progress. No payment details or paid plans in this version.

BEFORE YOU START

A few straight answers

Is it free?

Yes. The first circuit is available without signup, and all current training is free. An account is needed to save progress and XP. There are no paid plans in this version.

Does it work on my phone?

Yes. The free circuit has touch controls and a phone layout. Use a current browser; no app download or physical meter is needed. A larger screen gives you more room for complex wiring diagrams.

Is this an official certification?

No. DieselBench is independent educational training. It does not award a trade licence or certification, and it is not manufacturer service information. Actual vehicle testing and specifications must come from the correct service information.

What do I need to sign up?

Start the first circuit without an account. To save your result, use the sign-in method offered and keep access to that email address or account. You’ll review the Terms and Privacy Policy before saving. No payment details are required.

Don’t guess the part.Prove the fault.