Engine Performance 1, Week 8

The __________ section of a PCM contains the software for the computer, as well as a place to retain diagnostic trouble codes (DTC's), freeze-frame data, and learned data.

• Memory and storage

• Sensor input/output signal processing

• Data processing

• Output drivers

Tech A states that the PCM also communicates with other electronic control modules on the vehicle. Tech B states that the PCM is a gateway node that is connected to each of the other networks. Who is correct?

• Tech A

• Tech B

• Both A and B

• Neither A nor B

The                 of a PCM typically sends either simple on/off signals or pulse width-modulated signals to the actuators, depending on the actuator being controlled.

• Output drivers section

• Memory and storage section

• Data processing section

• Signal processing section

The data processor function of a PCM receives the data from the input signal processing section and compares it to           in the memory.

• Control module charts

• Adaptive learning

• Data maps

• Self-diagnostics

The                is hardware related and makes up the physical portion of the PCM.

• Output drivers section

• Memory and storage section

• Data processing section

• Signal processing section

In an engine management system, work is done by the actuators, which consist of all of the following EXCEPT:

• relays.

• solenoids

• modules

• capacitors

In an engine management system,                monitor various operating conditions.

 

• Memory devices

• Sensors

• Control modules

• Data processors

A variation in pulse width at a fixed frequency is called:

• duty cycle.

• analog cycle

• pulse-width modulation

• digital cycle.

When the oxygen sensor reaches its operating temperature, around          , it sends an output voltage to the control unit to signal whether the mixture is richer or leaner than a lambda value of 1.

• 350°F

• 400°F

• 600°F

• 750°F

The on and off time of a stepper motor relates to its duty cycle, which is generally expressed as a:

• percentage.

• numeric value.

• binary number.

• hexi-decimal value.