Auto 161 Final Exam

When checking the ECT sensor with a scan tool, about what temperature should be displayed if the connector is removed from the sensor with the key on, engine off?

-40ºF(-40ºC)

Typical primary coil resistance specifications usually range from ______ohms.

1-3

How much compressed natural gas (CNG) does it require to achieve the energy of one gallon of gasoline?

122 cubic feet

Ultra-Low-Sulfur diesel fuel has how much sulfur content?

15 PPM

OBD II has been on all passenger cars in the United States since _______.

1996

The computer will automatically clear a DTC if there is no additional detected faults after ______.

40 consecutive warm up cycles

Typical secondary coil resistance specifications usually range from _______ ohms.

6,000-30,000

A typical IAT of ECT sensor reads about 3000 ohms when tested using a DMM. This resistance represents a temperature of about _______.

70ºF (20ºC)

B20 biodiesel has how much regular diesel fuel?

80%

E85 means that the fuel is made from ________.

85% ethanol, 15% gasoline

The specific gravity of diesel fuel is measured in what units?

API gravity

A waste-spark ignition system ______.

All of the above

An ion sensing ignition system allows the ignition system itself to be able to ______.

All of the above

Methanol is also called ________.

All of the above

The comprehensive component monitor checks computer controlled devices for ____.

All of the above

The ignition module has direct control over the firing of the coil(s) of an EI system. Which component(s) triggers (controls) the module?

All of the above

A P0122 DTC is retrieved using a scan tool. This DTC means ______.

All of the above are correct

Winter blind gasoline ______.

All of the above.

A flex-fuel vehicle can be identified by ______

Any of the above

Ethanol can be produced from what products?

Any of the above

Most manufacturers of vehicles equipped with Diesel engines allow what type of biodiesel?

B5

The secondary ignition circuit can be tested using _______.

Both A and B

Technician A says that a tracked distributor cap can cause an engine misfire during acceleration. Technician B says that a defective spark plug wire can cause an engine misfire during acceleration. Which technician is correct?

Both Tech A and B

Tech A says that in going to high altitudes, engines produce lower power. Tech B says that most engine control systems can compensate the air- fuel mixture fo changes in altitude. Which tech is correct

Both Techs

Tech A says that spark knock, ping, and detonation are different names for abnormal combustion. Tech B says that any abnormal combustion raises the temperature and pressure inside the combustion chamber and can cause severe engine damage. Which tech is correct?

Both Techs

Two technicians are discussing distributor ignition. Technician A says that the pickup coil or optical sensor in the distributor is used to pulse the ignition module (igniter). Technician B says that some distributor ignition systems have the ignition coil inside the distributor cap. Which technician is correct?

Both Techs

Two technicians are discussing a no-start condition. Technician A says that an open pickup-coil could be the cause. Technician B says that a defective ignition control module (ICM) could be the Cause. Which Technician is correct?

Both Techs A and B

Technician A says that a defective spark plug wire or boot can cause an engine misfire. Technician B says that a tracked ignition coil can cause an engine to misfire. Which technician is correct?

Both tech A and B

Tech A says that the research octane number is higher then the motor octane number. Tech B says that the octane rating posted on fuel pumps is an average of the two ratings. Which Tech is correct?

Both techs

What rating of diesel fuel indicates how well a Diesel engine will start?

Cetane rating

When testing an ECT sensor on a vehicle, a digital multimeter can be used and the signal wire back probed. What setting should the technician use to test the sensor?

DC volts

Coil polarity is determined by the ________.

Direction of rotation of the coil windings

Vapor lock can occur ________.

During both A & B

The sensor that most determines fuel delivery when a fuel injected engine is first started is the ...

ECT (engine coolant temperature) sensor

What can be used to measure the alcohol content in gasoline?

Either A or B

E-diesel is diesel fuel with what additive?

Ethanol

Biodiesel is regular diesel fuel with vegetable oil added. True or false?

False

Producing liquid fuel from coal or natural gas usually uses which process?

Fischer-Tropsch

Which of these is a continuous monitor?

Fuel system monitor

DTC P0302 is a _______.

Generic DTC

Most diesel fuel is what grade?

Grade #2

Which sensor produces a square wave signal?

Hall Effect sensor

Global (generic) OBD II contains some data is what format?

Hexadecimal

Which method of blending ethanol with gasoline is the most accurate?

In-line

What happens to the voltage measured at the ECT sensor when the thermostat opens?

Increases slightly

To avoid problems with the variation of gasoline, all government testing uses _________ as a fuel during testing procedures.

Indolene

Because of _______, an ignition coil cannot be fully charged (reach magnetic saturation) until after a delay of about 10 ms.

Inductive reactance

Avoid topping off the fuel tank because ________.

It can saturate the charcoal canister

Which alcohol is dangerous (toxic)?

Methanol

A reluctor is a _______.

Notched ring or pointed wheel

When testing the ECT sensor with the connector disconnected, the technician should select what position on the DMM?

Ohms

By looking at the way diagnostic trouble codes are formatted, which DTC could indicate the gas cap is loose or defective?

P0442

The CKP sensor sends a signal to the _______ in an up-integrated ignition system.

PCM

The ______ sends a pulse signal to an electronic ignition module.

Pickup coil

A TP sensor is what type of sensor?

Potentiometer

Liquified petroleum gas (LPG) is also called _______.

Propane

Which is the most widely used alternative fuel?

Propane

What color diesel fuel dyed if it is for off-road use only?

Red

The pulse generator _______.

Signals the electronic control unit (module)

The primary (low- voltage) ignition system must be working correctly before any spark occurs from a coil. Which component is NOT in the primary ignition circuit?

Spark plug wiring

A P0118 DTC is being discussed. Technician A says that the ECT sensor could be shorted internally. Technician B says the signal wire could be open. Which Technician is correct?

Tech B only

A scan tool shows zero RPM while the engine is cranking. Technician A says that the RPM sender is bad. Technician B says that the crankshaft position sensor could be bad. Which Tech is correct?

Tech B only

Technician A says that an engine will not start and run if the ignition coil is tracked. Technician B says that the engine will not start if the crankshaft position sensor fails. Which Technician is correct?

Tech B only

Two technicians are discussing a stepped ECT circuit. Technician A says that the sensor used for a stepped circuit is different then one used in a non-stepped circuit. Technician B says that a stepped ECT circuit uses different internal resistance inside the PCM. Which Technician is correct?

Technician B only

Two technicians are discussing the IAT sensor. Technician A says that the IAT sensor is more important to the operation of the engine (higher Authority) then the ECT sensor. Technician B says that the PCM will add fuel if the IAT indicates the incoming air temperature is cold. Which Technician is correct?

Technician B only

A pending code is set when a fault is detected on ______.

The first fault of a two trip failure

When refueling a CNG vehicle, why is it recommended that the tank be filed to a high pressure?

The range of the vehicle is increased

Using ethanol- enhanced or reformulated gasoline can result in reduced fuel economy. True or false?

True

An ignition misfire or fuel mixture problem is an example of what type of DTC?

Type A

A freeze frame is generated on an OBD-II vehicle ______.

WHen a type A or B diagnostic trouble code is set.

What clogs fuel filters when the temperature is low on a vehicle that uses diesel fuel?

Wax