Deck 14: Chrysler Corporation Computerized Engine Controls

Question 1

Chrysler mass air flow (MAF)sensors are being discussed. Technician A says the sensor should be checked with a voltmeter set to DC volts. Technician B says the sensor produces a square wave digital signal. Who is correct?

A)Technician A only
B)Technician B only
C)Both A and B
D)Neither A nor B

Answer 1

B

Question 2

In a cable-operated system, which of the following is NOT required for the PCM to know to add additional fuel?

A)The driver must move the throttle pedal.
B)The throttle cable must move the throttle shaft.
C)The TPS must send the PCM a signal indicating that the throttle has opened the throttle plate.
D)The APP sensor must send a signal to the PCM to increase engine speed.

Answer 2

D

Question 3

The DIS ignition system is being discussed. Technician A says the camshaft position sensor (CMP)cannot identify individual cylinders. Technician B says the crankshaft position sensor (CKP)is driven by the torque converter drive plate. Who is correct?

A)Technician A only
B)Technician B only
C)Both A and B
D)Neither A nor B

Answer 3

B

Question 4

Which statement about the Chrysler direct ignition system (DIS)is NOT correct?

A)The system uses multiple coils.
B)The system connects each coil to the spark plugs of two companion cylinders.
C)The system is a waste spark ignition system.
D)The system uses an ignition module integrated in the PCM.

Question 5

Idle speed controls are being discussed. Technician A says the AIS actuator is pulse-width-modulated. Technician B says the PCM can move the AIS stepper motor through a total of 25 steps from fully closed to fully open. Who is correct?

A)Technician A only
B)Technician B only
C)Both A and B
D)Neither A nor B

Question 6

Which statement(s)about the Multi-Displacement System is/are correct?

A)During cruise, the PCM turns off the fuel injectors for four of the eight cylinders.
B)During cruise, the PCM simultaneously closes all of the valves on the disabled cylinders
C)During idle, the PCM will not disable the cylinders.
D)All of these statements are correct.

Question 7

Temperature sensors are being discussed. Technician A says the ECT sensor is a positive temperature coefficient (PTC)thermistor. Technician B says the IAT sensor is a negative temperature coefficient (NTC)thermistor. Who is correct?

A)Technician A only
B)Technician B only
C)Both A and B
D)Neither A nor B

Question 8

Manifold pressure is being discussed. Technician A says manifold pressure may be pressure that is lower than ambient pressure. Technician B says manifold pressure may be pressure that is higher than ambient pressure. Who is correct?

A)Technician A only
B)Technician B only
C)Both A and B
D)Neither A nor B

Question 9

A SBEC IIIA equipped vehicle comes into the shop with the MIL on. Technician A says the codes can be flashed on the MIL by cycling the ignition switch. Technician B says a scan tool must be used to extract the codes. Who is correct?

A)Technician A only
B)Technician B only
C)Both A and B
D)Neither A nor B

Question 10

What is the primary advantage that a Chrysler Multi Displacement System (MDS)offers over an engine that is not equipped with this system?

A)The MDS i ncreases the horsepower and torque ratings for a given engine
B)The MDS i ncreases the potential fuel economy during cruise conditions
C)The MDS s implifies the engine's overall design
D)The MDS i ncreases the overall durability of the engine

Question 11

Where is the fuel pressure regulator located in the Chrysler returnless system?

A)At the inlet to the fuel rail at the engine
B)At the outlet of the fuel rail at the engine
C)On the fuel pump module in the fuel tank
D)On the fuel pressure line coming from the fuel tank

Question 12

In 1996and newer SBEC systems, which of the following components are powered by the ASD relay?

A)The fuel pump
B)The fuel injectors
C)The heated oxygen sensors
D)The alternator field windings

Question 13

The A/C cutout relay is being discussed. Technician A says the PCM keeps the compressor engagement circuit open when the engine is operated at WOT. Technician B says the compressor cutout relay closes immediately after the engine starts. Who is correct?

A)Technician A only
B)Technician B only
C)Both A and B
D)Neither A nor B

Question 14

All of the following statements about the Programmable Communication Interface system are true EXCEPT that:

A)it is Chrysler's first multiplexing system.
B)it is an OBD II standardized protocol.
C)it is a medium-speed variable-pulse-width protocol.
D)its data bus is similar to General Motors' Class 2 data bus.

Question 15

The TMAP sensor used on some Chrysler engines combines which two sensors into one unit?

A)The TPS and MAP
B)The APP and MAP
C)The IAT and MAP
D)The ECT and MAP

Question 16

Ignition timing calculations by the PCM are made by monitoring all of the following sensors EXCEPT:

A)The tach reference pulse (CKP/CMP sensors)
B)The manifold absolute pressure (MAP)sensor
C)The coolant temperature (ECT)sensor
D)The intake air temperature (IAT)sensor

Question 17

Which statement is NOT true about the Fiat MultiAir system?

A)The PCM controls discharge valve opening.
B)Oil pressure is used to control valve opening.
C)The system has a constant oil feed of 20 to 30 PSI.
D)None of these statements are correct.

Question 18

EVAP systems are being discussed. Technician A says nearly all engines use a pulse width modulated purge solenoid valve. Technician B says the purge solenoid valve is controlled by the Evaporative Emissions Module. Who is correct?

A)Technician A only
B)Technician B only
C)Both A and B
D)Neither A nor B

Question 19

Which statement(s)is/are true about the Dodge Hemi V8 Ignition System?

A)The system uses 16 spark plugs
B)The system uses waste spark ignition
C)The system uses 8 coils
D)All of these statements are correct.

Question 20

Which of the following statements is true about Hall effect sensors?

A)The Hall effect sensor produces an analog signal
B)The Hall effect sensor generates its own voltage signal
C)The Hall effect sensor generates an AC signal
D)The Hall effect sensor generates a digital signal