FNIRSI Oscilloscopes for
Automotive DIYers.
Diagnose your car or motorcycle like a pro. Test sensors, analyze CAN bus signals, troubleshoot charging systems, and check ignition waveforms. Portable enough for the garage, powerful enough for real diagnostics.
What You Can Diagnose
Sensor Testing
Check crankshaft position sensors, camshaft sensors, MAF, MAP, and oxygen sensors. See the actual waveforms to verify they’re working correctly.
Ignition Analysis
View primary and secondary ignition waveforms. Diagnose coil problems, spark plug issues, and timing faults that cause misfires.
CAN Bus Diagnostics
Analyze CAN High and CAN Low signals. Find communication faults, verify bus integrity, diagnose module issues that set cryptic fault codes.
Charging System
Test alternator output for AC ripple. Diagnose bad diodes, worn brushes, and voltage regulator problems. Check battery health under load.
Fuel Injector Testing
Check injector pulse width and waveforms. Find stuck, clogged, or electrically faulty injectors causing rough running or poor fuel economy.
ABS & Wheel Sensors
Test wheel speed sensors and ABS reluctor rings. Diagnose intermittent faults that trigger warning lights but don’t set clear codes.
Recommended for Automotive DIY
FNIRSI DSO510 Mini 2-in-1
50MHz • 200MSa/s • Portable • 2.4″ LCD • Built-in Signal Generator
FNIRSI DST-210 3-in-1
10MHz Scope • 50MSa/s • 10000 Counts DMM • Signal Generator • 2.8″ Display
FNIRSI 2C53T 3-in-1
50MHz • 250MSa/s • 2 Channels • 20000 Counts DMM • Signal Generator
FNIRSI 1014D 7″ Touchscreen
100MHz • 1GSa/s • 2 Channels • DDS Generator • 7″ Touch Screen
Why DIY Mechanics Need an Oscilloscope
Your OBD2 scanner shows fault codes. An oscilloscope shows you why. When you get “P0340 – Camshaft Position Sensor Circuit Malfunction”, is it the sensor, the wiring, or the ECU? The scope tells you in seconds.
Professional mechanics use oscilloscopes because many faults don’t set codes, and codes don’t tell the whole story. For DIY diagnostics, it’s the difference between parts-cannon guessing and actually fixing the problem.
- Test sensors directly instead of guessing from fault codes
- Find intermittent faults that don’t set codes
- Verify repairs worked before reassembly
- Save money by not replacing good parts
Fault code: P0335
“Crankshaft Position Sensor Circuit”
Parts cannon approach:
New sensor = £45
Still has fault → New wiring?
Still has fault → ECU? £400+
Oscilloscope approach:
Scope shows good waveform
But signal drops at 3000rpm
→ Reluctor ring damaged
Fix: Clean debris from ring
What You Need for Car Diagnostics
| Diagnostic Task | Signal Type | Bandwidth Needed | Channels |
|---|---|---|---|
| Alternator ripple test | AC on DC | 10MHz plenty | 1 |
| Crankshaft/camshaft sensors | Variable reluctance / Hall | 20MHz | 1 (2 better) |
| Fuel injector waveforms | Inductive kick | 20MHz | 1 |
| CAN bus diagnostics | Differential pair | 50MHz | 2 (CAN-H + CAN-L) |
| Ignition primary | Coil signal | 50MHz | 1 |
| Oxygen sensors | 0-1V switching | 10MHz plenty | 1 |
What DIY Mechanics Say
“Intermittent misfire on my E46 BMW. Code reader said coil pack, but new coils didn’t fix it. Scope showed the crank sensor signal dropping out at high RPM. £15 sensor vs £200 in coils I didn’t need.”
“Use it for my classic bike collection. The dual channel is perfect for checking ignition timing on twin-cylinder engines. Much easier than strobe timing and way more accurate.”
“The handheld size is brilliant for working under the bonnet. Battery powered, no trailing wires. Checked my alternator diodes in 2 minutes—one was leaky. Saved me buying a new alternator.”
Automotive FAQ
Common questions from DIY car and motorcycle enthusiasts about using oscilloscopes for diagnostics.
Ask Us AnythingStop Guessing.
Start Diagnosing.
Professional mechanics use oscilloscopes because they work. Now you can too—without the professional price tag. From £38, delivered to your garage in 1-2 days.