Primary/Secondary Ignition Testing 2. Where does this voltage come from? __________________________________________ 3. The ignition coil connector terminals B and A are grounds and go to the ground studs located at the rear of the engine. Hook up a voltmeter set to read Hz (frequency) to terminal C (IC signal circuit) of the ignition coil connector. Start the engine and read the frequency of the IC circuit. A properly working circuit should read 3-20 Hz. What is the reading of the circuit being tested? __________ Hz 4. Shut engine down. 5. If the reading was 0 Hz, what could be wrong? __________________________________ ______________________________________________________________________ 6. Can the ignition coil primary circuit be tested for an open circuit with an Ohmmeter? _____________________________________________________________________ 7. Reconnect the injector and ignition coil. Start engine and ensure proper engine operation and clear any DTC’s with the scan tool.
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