ASE A6 Electrical Electronics Practice Test
47. The #2 and #3 cylinders of a four-cylinder engine are producing less secondary voltage than the #1 and #4 cylinders. According to the diagram above, which of the following is causing this condition?
- A. There is an open at point A of the ignition system.
- B. There is an open at point C of the ignition system.
- C. There is resistance at point C of the ignition system.
- D. There is resistance at point D of the ignition system.
Answer A is wrong. Answer C is correct.
Answer B is wrong. An open at point C results in no spark at the #2 and #3 cylinders.
Answer C is correct. Resistance at point C in the 2-3 coil’s power circuit will result in low output at the 2-3 coil only. This is because reduced primary voltage caused by electrical resistance results in low secondary voltage output. Perform a voltage drop test to confirm.
Answer D is wrong. Resistance in the crankshaft position sensor’s circuit will result in a corrupt signal and a likely no-spark condition at both coils.