Micro Trainer CAN Basic
Micro Trainer CAN Basic
Simulated CAN Bus Trainer for Multimeter Diagnostics
Important: This is not a live CAN bus. The Micro Trainer CAN Basic produces static DC voltage levels that simulate what a digital multimeter reads on an active CAN bus. You will not see toggling CAN frames on an oscilloscope - this board is purpose-built for teaching multimeter-based CAN bus diagnostics, the first step in any roadside or flightline troubleshooting workflow.
What It Does
The Micro Trainer CAN Basic gives students a safe, battery-powered circuit board to practice the voltage and resistance measurements used to diagnose CAN bus faults - without needing a vehicle, aircraft, or expensive bench equipment. Students learn to identify normal bus voltages, correct termination resistance, and five common fault conditions using only a standard multimeter.
Key Features
- Realistic CAN bus voltages - CAN_H reads ~2.7V, CAN_L reads ~2.2V, differential ~0.5V (matches real-world multimeter-averaged values)
- 5 fault injection switches - CAN_H shorted to ground, CAN_L shorted to ground, CAN_H-CAN_L short, open bus segment, and incorrect termination (60 ohm vs 120 ohm)
- LED status indicators - Green/red module status LEDs for ECM, TCM, and BCM, plus COMM DEGRADED and NO COMM indicators show students the system-level impact of each fault
- 11 labeled test points - Large pads sized for multimeter probe tips, clearly marked with expected readings
- Battery powered - Single CR2032 coin cell, no external power needed. Low-battery LED warns when replacement is needed
- Compact and portable - Flat SMD construction, fits in a tool bag or classroom kit
Designed For
- Automotive and aviation maintenance training programs
- Trade schools and community college electronics courses
- Self-study for ASE, A&P, or military MOS certification prep
What Students Will Measure
| Measurement | Normal Reading |
|---|---|
| CAN_H to GND | ~2.7V |
| CAN_L to GND | ~2.2V |
| CAN_H - CAN_L (differential) | ~0.5V |
| Termination resistance (correct) | 60 ohm |
| Termination resistance (fault) | 120 ohm |
Interactive CAN Diagnostic Simulator
A free browser-based demo that mirrors this board. Pick any of the five faults and see exactly what a multimeter would show you, measurement by measurement.
- Watch the live waveform and the averaged meter readings side by side
- See where the leads go for every reading, and why the differential is measured across the pair instead of to ground
- Flip the key between on and off to see why voltage and resistance are never measured at the same time
- Compare each reading against its known-good value, with out-of-spec readings flagged
▶ Open the CAN Diagnostic Simulator in your browser
How to use offline: Use the download button on that page to save the demo as a single HTML file. Double-click it to open in any browser — no internet needed.
What's Included
- Micro Trainer CAN Basic PCB (fully assembled and tested)
- CR2032 battery (installed)
Multimeter not included. Any standard digital multimeter with DC voltage and resistance modes will work.