Page 272 - Understanding Automotive Electronics
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2735 | CH 7 Page 259 Tuesday, March 10, 1998 1:15 PM
DIGITAL ENGINE CONTROL SYSTEM 7
11. The secondary air management 13. Secondary functions of a digital
system is used engine control system may
a. to control EGR include
b. to avoid knock a. evaporative emissions canister
c. with low-octane fuels purge
d. to improve performance of b. torque converter lockup
the catalytic converter c. secondary air management
d. all of the above
12. When knock is detected in a
closed-loop ignition system, 14. In a direct electronic ignition
spark timing is control system
a. initially advanced then a. the distributor is not
retarded slowly required
b. always advanced to BDC b. spark plugs are not needed
c. retarded then advanced c. the coil is not needed
d. none of the above d. none of the above
UNDERSTANDING AUTOMOTIVE ELECTRONICS 259
