The 8 Step Diagnostic Process - Linn–Benton Community ...

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Name(s) _________________________________________ 8_step_diagnose_lab

NOW! The 8 Step Diagnostic Process

Pick a 1996 or newer vehicle to use for this lab.

Model Year ____________

Vehicle Make __________________________

Vehicle Model _________________________

Engine Size ______________

VIN _____________________________

In the lab you will explain the eight step diagnosis process described in chapter 1 of Advanced Engine Performance Diagnosis (required textbook for this class)

1. Name Step 1 of the Diagnostic Process ___________________________________________ 1a. Explain in your own words how to perform step 1

2. Name Step 2 of the Diagnostic Process ___________________________________________ You need not perform every step outlined on page 2, 4, and 5 for every diagnosis.

I recommend using a good light to carefully examine the engine compartment for fuel leaks, vacuum hose condition, evidence of previous repairs, oil level & condition, air filter and air intake plumbing, coolant level (with caution), and battery voltage. Be sure to check the instrument cluster with the engine running to see if any dash warning lamps are ON.

Do smoke machine, spark tester, fuel pump pressure only if related to the problem. 2a. What is dangerous about checking the coolant level?

2b. What is the minimum voltage for a battery? ________________

2c. How many volts should a battery have at 2,000 RPM? __________________

Perform a visual inspection for your vehicle. 2d. List items found during that need service or should be noted reported to the customer.

2e. Identify any dash warning lamps turned ON with the engine running. (If all warning lamps are OFF type NONE) ________________________________________

2f. Battery voltage key off _________ Battery volts engine at (about) 2,000 RPM _________

Be prepared to discuss and point out components for each step of your visual inspection. When you are ready, demonstrate and discuss steps 1 and 2 with the instructor. ___ I have been checked by the instructor ___ I have NOT been checked by the instructor

3. Name Step 3 of the Diagnostic Process ___________________________________________ 3a. What does DTC stand for? __________________________________

3b. What does MIL stand for? __________________________________



Find the article linked above and read page 7. 3c. What does OEM stand for? ________________________________________ 3d. What does OBD stand for? ________________________________________

3e. Which Control Room turns ON and OFF the MIL? _______________________ Obtain a SOLUS PRO scan tool and the cables needed to connect to the DLC read pg 2 & 3 of the article linked above 3f. What does DLC stand for? ________________________________ Using the Thum Pad and Y button on the SOLUS PRO, select US Domestic, or Asian, or European depending upon your vehicle. Identify your vehicle to the Solus Pro. (You can refer to the VIN recorded at the beginning of this lab) Under Select System: select Engine. Under Main Menu (Engine) select Codes Menu then Display Codes Explore the menu options until you find Current Codes 3g. Record all current codes ___________________________________________________ Find the Intake Air Temp sensor (IAT) or the Engine Coolant Temperature sensor (ECT) (hint: use "Electrical Component Locations" in ShopKey5) IF YOUR SENSOR(s) ARE HARD TO ACCESS ON YOUR ENGINE TALK TO THE INSTRUCTOR! Disconnect the IAT or ECT and start the engine. Verify the MIL is ON.

3h. Record the DTC number set for the sensor you unplugged _______________________

4. Name Step 4 of the Diagnostic Process ___________________________________________ (Found in chapter 1 of your textbook)

Here is an article from ShopKey on DTC Searching... When searching for an OBDII Diagnostic Trouble Code (DTC), keep the search simple. Just put the code. For example, search for "p0140" instead of "diagnostic code p0140". Also be sure to use zeros in codes and not the letter "o", and no spaces.

4a. List the name of any TSB's for this code ___________________________ (write No TSB for "did not match any documents")

5. Name Step 5 of the Diagnostic Process ___________________________________________ Use the N button to back out until you find the Main Menu (Engine) then select Data Display If you are given a choice under the Data Menu select ENGINE DATA 1 You will see a data list of many sensors and actuators that are known as PID data

5a. What does PID stand for? _______________________________________ (Read the bottom of page 4 and top of page 5 in the Scan Tool Basics article linked below)



Scroll down the list of sensors and actuators. 5b. About how many PID's are listed? ___________________ It is useful to build a Custom Data List so you can focus on just a few PID's. Find and select the tool box at the top right of the SOLUS PRO screen. Inside the tool box select Custom Data List then Select/Deselect All By default all PID's are selected. Toggle to Deselect All by using the Y button. Once the * has disappeared from all PID's, scroll down and select *COOLANT and *INTAKE AIR

Press the N button. Usually information on RPM and TPS will stay at the top of the screen but

all other data should be gone except what you selected.

Find the VIEW icon - top left of the SOLUS PRO screen. Inside the VIEW box select 1 Graph

Use N to close VIEW box and scroll down until the Coolant or Intake Air PID is being graphed.

Plug the sensor back in and watch the graph change.

6. Name Step 6 of the Diagnostic Process ___________________________________________

6a. For the code that you have set which is the most appropriate next step? ___ Narrow the focus to a system ___ Narrow the focus to an individual cylinder

For engine performance problems that do not have a trouble code to guide you, step 6 is very important. When you are diagnosing using a DTC, the code number helps narrow the problem to a specific system.

7. Name Step 7 of the Diagnostic Process ___________________________________________ Find diagnostic steps for this DTC in Shop Key and All-Data. 7a. Record the name of the article with specific steps to diagnose this DTC in ShopKey

7a. Record the name of the article with specific steps to diagnose this DTC in All-Data

Using your SOLUS PRO, find and review Troubleshooter for this code.

Use the N button to find Main Menu (Engine) then scroll down to find Troubleshooter

Select >>* CODE TIPS then find the code that you just set for the ECT or IAT Scroll through the Code Tips and read what you should do for your specific code. 7b. Briefly explain the diagnostic procedure for your code.

8. Name Step 8 of the Diagnostic Process ___________________________________________ 8a. When should you NOT clear stored diagnostic codes after verifying the repair?

(carefully read step 8 on pg 6 & 7 of your textbook)

8b. What do you double check before returning the vehicle to the customer? When you are ready, demonstrate and discuss steps 3 through 8 with the instructor. ___ I have been checked by the instructor ___ I have NOT been checked by the instructor (Show how to create a custom data list, switch from graph to PID data, use troubleshooter)

Plug the sensor back in, Clear the codes, replace the tools and clean up the vehicle. e-mail this completed lab to phil.krolick@linnbenton.edu

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