WS5    Scan Tool Diagnostics

Make Toyota          Model Sprinter          Year 1996

(Course: using a Scan Tool that communicates to the engine you want to test.)

Warning: Be careful working around engines and exercise caution to avoid injury.

1. Scan Tool Data

1.1       Find a vehicle which is appropriate for the scan tool.

1.2       Connect the scanner, power it on, follow the instructions and input the correct vehicle information it asks for so you can view the data.

1.3       Find the data for the information listed on the next page. Turn engine on to idle. Fill in the letters used to label the information and the value of that data. (For example, engine load information may be found under MAP, with a value of 3.6, listed in volts) Note: not all vehicles will support all information, just find as much as you can. If the engine won’t run, input the information with the key on, engine off.

Type of information (PID = Parameter Identification)	Letters to describe it E.g. TPS	Value of data	Units for data E.g. volts
Engine Load (how much air comes in)		28	pka
Engine RPM		800	rpm
Throttle angle	TPS	0	%
Engine coolant temperature		85	c'
Intake air temperature
Fuel Injection opening pulse		2.0	ms
Transmission select position
Vehicle Speed		0
Oxygen sensor(s)
Fuel Trim
Idle control		39	%
Power steering condition
Air conditioning condition	AC signal	off	switch on/off
Exhaust Gas Recirculation (EGR)
Fuel Evap or Purge condition
Malfunction Indicator Light (MIL)
Barometric Pressure

2             Trouble Codes or Fault Codes

2.1       Find where the Codes are listed

2.2       Record any codes, and what system and condition they describe in the chart below (Example: might be code number 21, for Throttle Position Sensor, signal voltage too low) If there are no codes listed, put “none”.

Code number	System affected	Condition described
NO CODES

3             Lecturer put in Fault

3.1       Find your lecturer and have him create a fault under the hood (don’t look)

4             Record New Codes

4.1       Look up the codes now in the scan tool

4.2       Record the codes in the chart below. Also record what system is affected, and what condition is described.

Code number	System affected	Condition described
31	Vacuum sensor	no air goes in engine
22	coolant sensor	rich condition

5             Find What Data Has Changed

5.1       Look through the scan tool data to see what PIDs (Parameter Identification of system voltages) have changed. Which readings don’t make sense or don’t read what you would expect. Concentrate on the PIDs related to the codes.

5.2       Record the PIDs that have changed below:

Type of information (PID = Parameter Identification)	Letters to describe it	Value of data	Units for data
	RPM	875	rpm
coolant sensor	ECT	90'	c'
intake manifold		46	kpa

6             Visual Inspection to find fault

6.1       Do a visual inspection under the hood to find where the problem is. Use information from the code to know where to look for the problem and what type of problem to look for.

Describe problem you found:

We found that the vacuum sensor and the coolant temp sensor were unpluged so just lookd under bonnet and found them and connect them back in.

7             Repair fault

7.1       Plug back in the connector, or repair problem found

7.2       Describe what you did:

it was easy to fix the problem all we had to do is just plug them back in.

8    Recheck Data PIDs

8.1       Recheck the data with the scan tool

8.2       Record the voltages for the PIDs related to the problem, to confirm they are back to normal

Type of information (PID = Parameter Identification)	Letters to describe it	Value of data	Units for data
intake mainifold	lmp	27	kpa
coolant temp sensor	ect	90'	c'

9             Clear Codes 

Describe what you did to clear codes:

   

For Toyota you normally take out the main fuse for 30 seconds or more and you can also remove the negative battery terminal for 30 seconds once you done that it should be gone.

10         Recheck for codes and record codes in system now:

         

No Codes

11      Discuss the importance live data when fault finding

Sometimes, eventhough the vehicle has problem but  scan tool can not scanning the code. In this case, Live data is important to dignose the any faulty.

12      Explain the need for parameters when checking live data

        

All sensors have available range of signal out.  Parameter is need to check if it is in available 

range.

13     Discuss how a scan tool can aid you when fault finding

Scan tool can save time to dignose the vehicle faulty  and can make sure what fault is fault. Sometimes, Without any symton, we can find the vehicle fault but It doesn't give a correct data everytime. 

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