The use of exhaust gas recirculation to assist in emissions control is common to most manufacturers. Technician B says that the root cause of a converter failure should be diagnosed and repaired before a replacement converter is installed.Drivability EGR Ford EGR exhaust gas recirculation exhaust greenhouse gases emissions repair shop training technician training automotive aftermarket Technician A says that a converter that rattles when tapped with a mallet should be replaced.
Engine exhaust gas recirculation system monitor code#
While servicing a vehicle, you retrieve the diagnostic code P0401, "EGR (exhaust gas recirculation) flow insufficient." Which of these is the most likely cause?Ģ0. Technician B says that if a PCV valve rattles, it's working properly. Technician A says that a 3 × 5 card should be held against the oil fill opening if the positive crankcase ventilation (PCV) system is operating correctly. Technician B says that the catalytic converter should be positioned as far away from the engine as possible. Technician A says that the location of the catalytic converter isn't important. Technician B says that the engine computer will run the EVAP monitor when fuel level is within 15 to 25 percent and the TP sensor position is between 9 and 10 percent. Technician A says that serious monitor faults cause a blinking malfunction indicator lamp (MIL) or even an engine shutdown. Two technicians are discussing the evaporative emission monitor. Technician B says that a defective drive belt may cause AIR system problems. Technician A says that carbon monoxide (CO) and hydrocarbon (HC) levels should increase if the air injection reactor (AIR) hoses are pinched off. Technician B says that you should repair engine problems such as dieseling, misfiring, or stumbling as soon as possible. To avoid excessive catalyst temperatures and the possibility of fuel vapors reaching the converter, the following rules are being discussed: Technician A says that it's okay to use any fuel additives or cleaners in the fuel system. Technician B says that nitrogen gas pressurization uses nitrogen gas under a very low pressure (lower than 1 psi) in the fuel system you listen for escaping air with amplified headphones. Technician A says that the most efficient method of EVAP system leak detection is introducing smoke under low pressure from a machine specifically designed for this purpose. What effect will this have on 5-Gas Analyzer gas readings?ġ2. A vehicle has a crimped fuel return line. Technician B says that CO2 levels of 20 to 25 percent are considered acceptable.ġ1.
Technician A says that the higher the level of CO2 in the exhaust stream, the more efficiently the engine is operating. Two technicians are explaining what exhaust gas emissions tell you about engine operation.
EGR temperature sensor voltage during cruiseġ0. EGR valve operation during decelerationĬ. EGR valve operation during accelerationī. Which one of the following is the best parameter to monitor with a scan tool?Ī. You're using a scan tool to evaluate the overall exhaust gas recirculation (EGR) system operation on a vacuum-type EGR system.
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