Engine Management

A technician runs a scan and receives a fault code indicating a problem in the MAF sensor circuit. Technician A says this could be caused by a loose wire or an intermittent open. Technician B says this could be caused by a faulty MAF sensor. Who is correct?

• Technician A
• Technician B
• Both A and B
• Neither A or B

The MAF sensor is what type of device to the engines computer?

• Controlled

• Input

• Memory

• Diode retronic memory

The higher the octane rating is used in gas engines with?

• Higher compression ratios

• Older engines

• Economy engines

• Fuel Injected Engines

Tech A says that APP sensors get a signal from the H02S to help with idle controls. Tech B say APP sensors have multiple potentiometers that communicate with the engines computer. Whos correct?

• Tech A

• Tech B

• Both A & B

• Neither A nor B

Sensor used to inform the ECM the position of the throttle valve?

• ECT

• TCP

• TPS

• APP

Sensor used to tell the computer the amount of O₂ in the exhaust stream?

• ECT

• EST

• TP

• HO2S

Sensor used to tell the computer the temperature of the engine coolant?

• ECT

• EST

• TP

• HO2S

Sensor used to tell the computer how much air the engine is taking in through the throttle?

• MAP

• MAF

• AFS

• IAT

Extremely high altitude will cause a naturally aspirated engine to run?

• Fast

• Smooth

• Rich

• Lean

What sensor or component in an electronic fuel injection system would detect a defective fuel pressure regulator?

• Post Cat - HO2S

• TP Sensor

• Pre Cat - HO2S

• IAC