Electronic Fuel Systems

Question 1

A ______ signal is either on or off between 2 fixed voltages

Answer 1

Digital

Question 2

Process of converting an analog signal to a digital signal?

Answer 2

Encoding

Question 3

RAM is volatile, what does that mean?

Answer 3

When key is turned off, info is lost

Question 4

What characteristics make up an EEPROM memory system?

Answer 4

Can re-program using a diagnostic reader or computer. Makes for easy reprogramming

Question 5

__________ transfer output signal when connected to a diagnostic scan tool or a personal computer

Answer 5

data link

Question 6

_______ is the method of connection for a network, such as wires or fibre optic cables

Answer 6

Backbone

Question 7

_______ is the speed of data transfer over the network, meaured in kilo-baud per second

Answer 7

baud rate

Question 8

________is a common language for data communication between control modules

Answer 8

Protocol

Question 9

A temperature sensitive resistor

Answer 9

Thermistor

Question 10

Thermistors for temperature sensors usually have _____ resistance when cold, and ______ when hot

Answer 10

high, low

Question 11

To minimize damage to ECM and PC, when should you connect and disconnect from a DDL?

Answer 11

When the vehicle key switch is off

Question 12

3 main sensors to control fuel injection process in EUI?

Answer 12

throttle position
intake manifold pressure
engine speed and timing

Question 13

what are the 4 stages of fuel injection in EUI?

Answer 13

1. pre-injection
2. injection
3. end of injection (spill)
4. fill

Question 14

The best repair of a damaged wiring harness is?

Answer 14

complete replacement

Question 15

when performing the wiggle test, what state is the machine in?

Answer 15

key on but engine not running

Question 16

what is an example of a fault code that would appear only when the unit is running?

Answer 16

engine speed timing circuit code

Question 17

What should you do before removing a fuel injector regarding the fuel and why?

Answer 17

Drain the fuel passages to prevent a hydraulic lock from fuel entering the cylinder

Question 18

What should you do before removing rocker assemblies?

Answer 18

Back off the adjusting screws to prevent tension damage to the rocker shaft