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ELECTRONIC FUEL INJECTION FINAL STUDY GUIDE QUIZZES & ANS!!
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ELECTRONIC FUEL INJECTION FINAL STUDY GUIDE QUIZZES & ANS!!
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ELECTRONICFUEL INJECTION
FINAL STUDY
GUIDE QUIZZES
& ANS!!
Evatee 10/20/24 ELECTRONIC FUEL INJECTION
, ELECTRONIC FUEL INJECTION FINAL STUDY
GUIDE QUIZZES & ANS!!
ISC (idle speed control) Answer - - PCM uses inputs to determine the idle
speed
- a dirty passage can cause low idle speeds
MAF (mass air flow) sensor Answer - - measures the volume of air by weight
entering the engine
- uses a heated wire that is cooled by the incoming air to measure the volume
- hot film GM meters can be tested by tapping on them
- meters can be tested by unplugging and driving to see if issues go away
O2 (oxygen) sensor Answer - - measures O2 in the exhaust stream
- pre OBD-II use one in the exhaust stream
- post OBD-II use one before the catalyst converter and one after
- post OBD-II sensors have a heating element to speed the sensor to operation
temperature, they use 4 wires
- operation is checked with a volt meter or lab scope
MAP (manifold absolute pressure) sensor Answer - - measures pressure in the
intake manifold
- voltage goes low if vacuum is high
PFI (port fuel injection) Answer - - uses one injector for each cylinder
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