Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
29 Cards in this Set
- Front
- Back
|
The diagnostic process is a strategy that______________ in order to find the root cause of automotive engine performance. |
Eliminate known good component |
|
|
Why are diagnostic steps shape as a funnel? |
Top are wide systems and narrow down to possible cause |
|
|
Why is verifying the problem very important? |
To be certain that the problem exist |
|
|
List and memorize the 7 diagnostic questions you need to ask the customer |
Is the check engine light? What is the temperature outside? Was the engine warm or cold? How far was the vehicle driven? Does the problem occur in acceleration, starting, or cruise? Where any dash warning light on? Is there any recent service or repair done? |
|
|
List the 8 diagnostic steps: |
Verify problem visual inspection retrieved DTC check TSB check scan tool data Narrow the fault Find root and cause Verify problem and clear DTC |
|
|
What is the difference between the standard spark tester and and electronic spark tester? |
Electronic spark tester take high voltage to jump gap |
|
|
Why is it important to check the fuel pump pressure? |
Fuel pump will cause intermittent drivability problem when weak, clogged line, and restricted fuel filter |
|
|
Why is it important to check TSB's? |
To match the symptoms and the solution to the problem |
|
|
What must be done if no communication is established to the scan tool? |
Check for power and ground to the DLC connector |
|
|
Why should you check if the monitors have all been run? |
DTC is not set if a problem exists when monitor |
|
|
What is the units displayed on typical data for cycles of misfire data at idle, Park, closed loop? |
Misfiring count 0 to 99 |
|
|
What is the units displayed and typical data for MAF sensor at idle, Park, close loop? |
Grams per second 3 to 7 |
|
|
What is one technique used in troubleshooting using diagnostic trouble codes when a DTC for a TP sensor indicates an open circuit? |
Create an opposite circuit and short the signal to ground |
|
|
Clearing the trouble codes will also clear ______________. |
All the noncontinuous monitor. |
|
|
What is the most preferred method to clear trouble codes? |
Scan tool |
|
|
Describe two other ways to clear trouble codes without a scan tool: |
Disconnect fuse power to the computer disconnect battery and fusible link power to computer |
|
|
GM vehicles from 1980 to 1995 allowed fault code retrieval without a scan tool by |
Contact terminal A & B to DLC |
|
|
On Chrysler vehicles how would you retrieve the trouble codes without a scan tool |
Cycle ignition key 3 times |
|
|
What year did the government standardize the shape and pin location of DLC? |
1996 |
|
|
All "P" codes with the first two numbers 02 such as P0201 or P0214 are faults related to: |
Fuel and air metering injector circuit |
|
|
How does the PCM monitor the operation of the EGR valve? |
It opens the EGR valve and look at the map sensor |
|
|
What is a snapshot or freeze frame? |
Engine related data stored when DTC is set |
|
|
If there are multiple fault codes which freeze frame data will be stored? |
The code that is higher priority |
|
|
List four of the eight freeze frame data items |
Air fuel ratio ETC, IAT, MAP, MAF, and TP data Closed loop and open loop Short term and long term fuel trim |
|
|
What is the SAE j2534 mandate |
Enable independent shop the ability to program PCM |
|
|
What is the name of the website that has all the links for manufacturers software update, cost, and conditions? Check out this website and determine the average cost of a one day access: |
Www.NASTF.org, $10 |
|
|
Why is it important to follow the manufacturer's diagnostic routine? |
To find root cause and verify repair |
|
|
Explain the brake pedal trick and why is it done |
To drain voltage to the PCM capacitor |
|
|
How would you know if a system monitor was run and passed? |
Scan tool check for readiness |
