The Auto Signal Generator XH-2A is a handheld diagnostic simulator specifically designed to mimic the output of automotive sensors, particularly Hall effect and magnetoelectric (magnetic) crankshaft and camshaft position sensors. It allows technicians to test Engine Control Units (ECUs), ignition modules, and fuel injection systems without a running engine. Key Signal Simulation Features Crankshaft Pattern Simulation: Includes 9 pre-embedded missing tooth patterns for crankshaft signals (e.g., 58 2/60-2, 58 1, 57 2, 57 1, 37 1, 36 2, 35 1, 34 2, and 22 1). Custom Waveform Editing: Allows users to manually modify the number of teeth and missing teeth to match specific vehicle requirements. Dual Signal Output: Can generate Hall signals (5V square wave) and magnetoelectric signals (1-5V AC sine wave) simultaneously. Broad Frequency Range: Offers adjustable output from 2Hz to 8KHz (some variants up to 10KHz), covering speeds from idle to high RPM. Odometer & ABS Testing: Can simulate standard 60 0 signals to drive odometers, test speedometers, or inspect ABS wheel speed sensors. Technical Specifications Feature Range / Value Power Supply DC 12V – 24V Frequency Range 2Hz to 8,000Hz (divided into 9 selectable ranges) Hall Signal Output 5V TTL-level square wave Magnetoelectric Output 1V to 5V AC (voltage varies with frequency) Display LED/Digital Tube screen for parameter selection Circuit Protection 12V-24V wide voltage support (recommend 150Ω resistor for long 24V use) Professional Use Cases for BHT Store Customers ECU Repair & Testing: Inject a 58 2 signal to see if the ECU triggers the fuel pump and ignition coils. Odometer Calibration: Drive the speedometer signal to verify cluster functionality after a repair. Intermittent Fault Finding: Bypass a suspect sensor to see if a “misfire” or “no-start” condition clears up. Circuit Integrity Testing: Bypass a suspected faulty sensor to determine if a signal issue is caused by the sensor itself or the vehicle’s wiring harness. XH-2A AUTO SIGNAL GENERATOR: QUICK START GUIDE Your Essential Guide to Sensor Simulation & ECU Testing 1. Safety & Power Connection Voltage Range: The device operates on 12V to 24V DC. Connection: Connect the Red clip to the battery positive ( ) and the Black clip to the battery negative (–) or a clean chassis ground. Warning: Do not connect to AC mains. Always ensure the vehicle battery is stable before testing. 2. Understanding the Output Modes The XH-2A features two primary signal outputs. Choose the correct one for the sensor you are simulating: Magnetoelectric (Analog/Sine Wave): Usually 2-wire sensors. Use this for older ABS sensors or magnetic crank sensors. Hall Effect (Digital/Square Wave): Usually 3-wire sensors (Power, Ground, Signal). Use this for modern camshaft and crankshaft sensors. 3. Simulating Crankshaft Signals (Missing Tooth) The XH-2A is famous for its “Missing Tooth” simulation, essential for starting an engine on the bench or testing an ECU. Step 1: Use the Mode/Function button to cycle to the missing tooth patterns. Step 2: Select the pattern that matches the vehicle (e.g., 58 2 is standard for many Toyota and GM engines). Step 3: Adjust the Frequency knob to simulate RPM. Start low (around 10Hz–20Hz) to mimic “cranking” speed. 4. Testing Speedometers & Odometers Pattern: Select the 60 0 (Continuous) signal. Connection: Connect the signal lead to the instrument cluster’s speed signal input pin. Testing: Slowly turn the frequency knob clockwise. You should see the speedometer needle rise steadily. 5. Common Troubleshooting Issue Possible Solution No Signal Output Check the LED display. If off, verify your 12V battery clips are tight. ECU Not “Waking Up” Ensure you are using the correct signal type (Hall vs. Magnetic) and that your frequency isn’t too high. Distorted Signal Ensure the ground connection (Black clip) is shared between the XH-2A and the ECU you are testing. Support Note: For further technical assistance or to browse our full range of ECU tools, visit or contact us via WhatsApp.
