Chapter 72; ignition system diagnosis
and service questions with answers
A spark tester should be used to check for spark because ________. - ANS ✔✔a spark tester
requires at least 25,000 volts to fire
Technician A says that a defective spark plug wire or boot can cause an engine misfire.
Technician B says that a tracked ignition coil can cause an engine misfire. Which technician is
correct? - ANS ✔✔Both technicians
Poor engine performance could be the result of a ________. - ANS ✔✔defective coil, distributor
ignition with the CMP and CKP not correctly indexed, and a high-voltage spark leak
Typical primary coil resistance specifications usually range from ________ ohms. - ANS ✔✔Less
than 1-3 ohms
Typical secondary coil resistance specifications usually range from ________ ohms - ANS
✔✔6,000 - 30,000
What should be inspected as part of a visual inspection of the ignition system? - ANS ✔✔Spark
plug wires for proper routing
Which can be used to test for a fault with a cylinder on a waste-spark system? - ANS ✔✔Using
short sections of rubber hose attached to the coil terminals
Two technicians are discussing a no-start (no spark) condition. Technician A says that an open
CKP sensor could be the cause. Technician B says that a defective ignition control module (ICM)
could be the cause. Which technician is correct? - ANS ✔✔Both technicians
and service questions with answers
A spark tester should be used to check for spark because ________. - ANS ✔✔a spark tester
requires at least 25,000 volts to fire
Technician A says that a defective spark plug wire or boot can cause an engine misfire.
Technician B says that a tracked ignition coil can cause an engine misfire. Which technician is
correct? - ANS ✔✔Both technicians
Poor engine performance could be the result of a ________. - ANS ✔✔defective coil, distributor
ignition with the CMP and CKP not correctly indexed, and a high-voltage spark leak
Typical primary coil resistance specifications usually range from ________ ohms. - ANS ✔✔Less
than 1-3 ohms
Typical secondary coil resistance specifications usually range from ________ ohms - ANS
✔✔6,000 - 30,000
What should be inspected as part of a visual inspection of the ignition system? - ANS ✔✔Spark
plug wires for proper routing
Which can be used to test for a fault with a cylinder on a waste-spark system? - ANS ✔✔Using
short sections of rubber hose attached to the coil terminals
Two technicians are discussing a no-start (no spark) condition. Technician A says that an open
CKP sensor could be the cause. Technician B says that a defective ignition control module (ICM)
could be the cause. Which technician is correct? - ANS ✔✔Both technicians
