QDB-4A Auto Ignition Coil, Injector & Solenoid Tester

Get faster answers when ignition and fuel-system faults slow the job down. The QDB-4A gives you a clear way to check coils, injectors, solenoid valves, and stepper motors without wasting time on guesswork.

It keeps diagnosis focused, so you can confirm which component is responding and which one needs attention.

Make component testing clearer from the first check

✅ Pinpoint faulty ignition coils sooner and avoid replacing the wrong part

✅ Simulate fuel injector signals for quick confirmation before reinstalling components

✅ Test solenoid valves with adjustable duty cycles to see how they respond

✅ Evaluate stepper motors with controlled signals for smoother diagnosis

✅ Recreate real-world conditions with adjustable output to uncover hidden electrical faults

✅ Match different vehicle needs with support for 12V and 24V injector testing

✅ Stay protected during testing with reverse polarity and overcurrent protection

The QDB-4A suits workshop use where accuracy and speed matter. Its large screen and clean interface make it easier to follow each test, especially when moving between different automotive components.

When you need to check conditions like frequency changes, duty-cycle changes, or voltage output, the adjustable controls keep the process clear and repeatable. That makes it easier to trace intermittent issues and confirm how a part behaves under specific working conditions.

The tester covers independent, module-type, and coil-on-plug ignition coils, plus gasoline and diesel injectors at 12V or 24V. It also supports idle control motors, instrument panel motors, headlight adjustment motors, and adjustable Hall signal output for AC pressure systems and airflow meters.

With a working range of 12V–24V, driving current up to 3.5A, frequency from 1Hz to 100kHz, duty cycle from 1% to 100%, and voltage adjustment from 1.25V–11.5V, you get the control needed for detailed diagnosis. The 17 × 9.8 × 2.8 cm housing keeps the unit manageable on a crowded bench, and the included cables and adapters simplify setup across different systems.

Keep your diagnostic process organized and verify more components with less delay.