684 Auto Electricity and Electronics Copyright by Goodheart-Willcox Co., Inc. 16. Which of the following test measures the spark plug fi ring voltages when engine speed is rapidly increased? (A) Load test. (B) Cylinder balance test. (C) Ignition coil test. (D) EFI injector test. 17. What is a rotten egg smell from the exhaust an indication of? 18. What can cause higher-than-normal hydrocarbon readings? 19. What are typical causes of high carbon monoxide readings? 20. When using a four- or fi ve-gas exhaust analyzer, oxygen readings should be between _____ and _____. ASE-Type Questions—Chapter 34 1. An engine misses when cold. Technician A says all parts that aff ect cold engine operation should be checked until the problem is found. Technician B says the coolant temperature sensor should be replaced. Who is right? (A) A only. (B) B only. (C) Both A and B. (D) Neither A nor B. 2. Th e OBD II drive cycle must be performed before an emissions test. Technician A says the drive cycle generally takes between 20 and 30 minutes to complete. Technician B says you should allow the engine to reach normal operating temperature before starting the drive cycle. Who is right? (A) A only. (B) B only. (C) Both A and B. (D) Neither A nor B. 3. Technician A says freeze spray can be used when checking electronic parts for temperature-related performance problems. Technician B says a heat gun and a digital thermometer can be used when checking electronic components for temperature-related performance problems. Who is right? (A) A only. (B) B only. (C) Both A and B. (D) Neither A nor B. 4. Technician A says low circuit resistance can aff ect a square waveform. Technician B says high circuit resistance can aff ect a square waveform. Who is right? (A) A only. (B) B only. (C) Both A and B. (D) Neither A nor B. 5. Technician A says a cylinder balance test can be used to check cylinders for low compression. Technician B says a cranking balance test can be used to check cylinders for low compression. Who is right? (A) A only. (B) B only. (C) Both A and B. (D) Neither A nor B. 6. Scope sweep rate is commonly given in: (A) seconds. (B) milliseconds. (C) microseconds. (D) nanoseconds. 7. An oscilloscope is being used to check for ignition system problems. Technician A says the secondary scope pattern is generally used to check system operation. Technician B says the primary scope pattern is generally used to check system operation. Who is right? (A) A only. (B) B only. (C) Both A and B. (D) Neither A nor B. 8. Technician A says the intermediate section of the secondary pattern shows voltage fl uctuations aft er the plug stops fi ring. Technician B says voltage in the intermediate section should swing up and down four times at low engine speeds. Who is right? (A) A only. (B) B only. (C) Both A and B. (D) Neither A nor B. 9. A four-gas exhaust analyzer can be used to measure each of the following except: (A) hydrocarbons. (B) oxides of nitrogen. (C) carbon monoxide. (D) oxygen. 10. An exhaust gas analyzer reveals a high carbon monoxide reading. Technician A says a leaking fuel injector could be causing the problem. Technician B says a defective input sensor could be causing the problem. Who is right? (A) A only. (B) B only. (C) Both A and B. (D) Neither A nor B.