Fuel Injector Pulse Tester – 4-Mode 12V Diagnostic Tool

Test a Suspect Fuel Injector Before Replacing Parts Rough idle, hard starting, poor acceleration, or suspected injector trouble? This compact 12V fuel injector tester sends controlled electrical pulses directly to a compatible injector with the engine off, helping you check its response one injector at a time. Connect. Select a pulse mode. Test the injector. Why Choose This Fuel Injector Tester? Test individual injectors directly instead of relying on guesswork 4 selectable pulse modes for different testing patterns Powered by your vehicle's 12V battery — no separate power supply Digital mode display makes the selected test easy to see Signal indicator shows when a pulse is being sent Compact enough for your toolbox, garage, or workshop Check Injector Response Before Replacing It When you suspect a fuel injector problem, replacing parts without testing can get expensive quickly. This tester lets you electrically activate a compatible injector with the engine off, helping you determine whether it responds to a controlled pulse signal. Use it to help troubleshoot suspected: Injectors that fail to respond electrically Non-responsive injectors Uneven injector behavior Injector-related starting or idle problems For more complete diagnosis, combine injector activation testing with the appropriate vehicle service procedure and, where applicable, a compatible fuel-pressure or flow test. 4 Pulse Modes for More Flexible Testing Different test situations may require different pulse patterns. The tester provides four selectable modes: Mode 1 — Single Pulse One pulse with an approximate width of 255 ms. Mode 2 — Short Pulse Sequence 50 pulses, approximately 7 ms per pulse. Mode 3 — Long Pulse Sequence 100 pulses, approximately 3.5 ms per pulse. Mode 4 — Continuous Pulse Continuous output at approximately 50 pulses per 1450 ms, with an approximate 7 ms pulse width. Simply press MODE SET to select your test pattern and PULSE to activate the injector. Simple Controls. No Complicated Menus. No laptop. No app. No complicated scanner interface. The front panel gives you three straightforward controls: MODE SET — select the pulse pattern PULSE — send the test signal RESET — reset the tester before changing modes The digital display shows the selected mode, while the indicator light confirms pulse output. Powered Directly From a 12V Car Battery Connect the supplied red and black battery clips to a standard 12V automotive battery. That makes the tester convenient for: Garage troubleshooting Workshop use On-vehicle troubleshooting DIY automotive diagnostics No wall outlet or separate power adapter is required. Know Exactly What This Tool Does This is an injector pulse tester, not an OBD scanner. It does not: Read or clear fault codes Measure fuel pressure by itself Automatically identify the exact cause of an injector fault Clean or flush an injector by itself Its job is to send controlled electrical pulse signals to a compatible fuel injector so you can test its response. That makes it a useful complement to other diagnostic tools rather than a replacement for full fuel-system testing. Perfect For DIY vehicle owners Professional mechanics Automotive workshops Injector troubleshooting Rough-idle diagnosis Hard-start troubleshooting Suspected injector-response problems Comparing individual injector behavior Use alongside compatible fuel-pressure testing equipment How to Use 1. Turn the Engine Off The vehicle engine must be completely off before testing. Work in a well-ventilated area and keep fuel away from sparks, flames, and hot engine components. 2. Disconnect the Injector Connector Disconnect the electrical connector from the injector you want to test. Connect the tester's pulse output leads to the compatible injector terminals according to the appropriate vehicle/injector procedure. 3. Connect the 12V Battery Connect: Red battery clip → Positive (+) Black battery clip → Negative (–) 4. Select Your Pulse Mode Press MODE SET until the desired mode appears on the display. 5. Send the Test Pulse Press PULSE. The signal indicator illuminates while the tester sends the selected pulse pattern to the injector. After testing, use RESET before selecting another mode when required. Product Details & Specifications Specification Details Product Type Automotive Fuel Injector Pulse Tester Model CNBJ-620 Main Function Direct individual injector pulse testing Power Supply 12V automobile battery Number of Test Modes 4 Mode 1 Single pulse, approx. 255 ms Mode 2 50 pulses, approx. 7 ms each Mode 3 100 pulses, approx. 3.5 ms each Mode 4 Continuous, approx. 50 pulses / 1450 ms, 7 ms pulse width Controls Mode Set / Pulse / Reset Display Digital mode display Pulse Indicator Yes Working Temperature 0°C to 40°C / 32°F to 104°F Working Humidity ≤80% RH Storage Temperature -20°C to 50°C / -4°F to 122°F Storage Humidity ≤85% RH Main Unit Size Approx. 125 × 72 × 25 mm Imperial Size Approx. 4.92 × 2.83 × 0.98 in Weight Approx. 162 g / 5.7 oz Injector Compatibility Compatible 12V gasoline fuel injectors What's Included 1 × Fuel injector pulse tester Integrated red/black 12V battery power leads Injector pulse output leads 1 × Instruction manual