ASE T1 Domain 5: Ignition System Diagnosis and Repair Welcome to your ASE T1 Domain 5: Ignition System Diagnosis and Repair 1. ASE T1: Ignition System Diagnosis and Repair A vehicle with a distributor-less ignition system (DIS) has a misfire on one cylinder. The spark plugs and wires appear to be in good condition. What should be the technician's NEXT step? A. Replace the ignition coil for the misfiring cylinder. B. Swap the ignition coils between two cylinders to see if the misfire follows the coil. C. Perform a compression test on the misfiring cylinder. D. Check for a faulty crankshaft position sensor. None 2. ASE T1: Ignition System Diagnosis and Repair A technician is diagnosing a Direct Ignition System (DIS) that has no spark at any of the cylinders. Which of the following could be the cause? A. A single faulty spark plug B. A bad camshaft position sensor C. An open in the secondary ignition circuit D. Defective fuel injector None 3. ASE T1: Ignition System Diagnosis and Repair During the inspection of an ignition system, a technician finds oil in the spark plug tube of an overhead cam engine. What is the MOST likely cause? A. Worn valve guides B. Cracked spark plug insulator C. Leaking spark plug tube seals D. Faulty oil pump None 4. ASE T1: Ignition System Diagnosis and Repair An engine has a random misfire code, and the technician has determined that it is not fuel-related. Which of the following ignition system checks should be performed FIRST? A. Inspect the spark plugs and spark plug wires. B. Test the ignition coil resistance. C. Check the ignition module's power and ground. D. Scope the crankshaft and camshaft position sensors. None 5. ASE T1: Ignition System Diagnosis and Repair A vehicle with coil-on-plug ignition has an intermittent misfire. The spark plugs, ignition coils, and fuel system have been checked and are functioning properly. What should the technician inspect NEXT? A. Ignition coil connectors and harness B. EGR system operation C. Compression in the misfiring cylinder D. Powertrain Control Module (PCM) None 6. ASE T1: Ignition System Diagnosis and Repair When diagnosing an engine with a wasted spark ignition system that misfires only on one pair of companion cylinders, what should be the technician's FIRST action? A. Replace the ignition module. B. Check for a faulty ignition coil. C. Perform a cylinder leak-down test. D. Inspect the crankshaft position sensor. None 7. ASE T1: Ignition System Diagnosis and Repair A technician has confirmed that an engine with a coil-on-plug ignition system has no spark at all cylinders. Which of the following is the MOST likely cause? A. All spark plugs have fouled. B. The ignition switch is faulty. C. The powertrain control module has failed. D. There is a problem with the engine's ground strap. None 8. ASE T1: Ignition System Diagnosis and Repair If an ignition coil on a modern distributor-less ignition system has excessive primary resistance, what is the likely result? A. Increased fuel consumption B. Engine overheating C. Weak spark and potential misfire D. Damage to the crankshaft position sensor None 9. ASE T1: Ignition System Diagnosis and Repair After replacing an engine control unit on a vehicle with a distributor ignition system, the engine has a high-speed misfire. What should be the technician's FIRST step? A. Re-check the base ignition timing. B. Replace the distributor cap and rotor. C. Conduct a secondary ignition scope test. D. Perform a fuel pressure test. None 10. ASE T1: Ignition System Diagnosis and Repair A technician uses an oscilloscope and notices a high firing line with reduced spark duration during an ignition system test. What does this suggest? A. The spark plug gap is too wide. B. There is low secondary resistance. C. The ignition coil is overcharging. D. The spark plug gap is too narrow. None 1 out of 10 Time is Up! Time's up
