Broadband Oxygen Sensor Diagnostics is cutting edge and looks into technologies in current cars. This seminar is Scope and Scantool intensive.
We train you in first-shot diagnostics, working with a scope/scanner as your primary weapons to remove the guess work. The diagnostician
can bring his/her own scope and scantool, or use our high speed dual channel scopes ATS or Launch Scantool
Some of the contents from the Broadband Oxygen Sensor Diagnostics training.
Following are some of the topics covered:
The chemical background of emissions pre-cat and post-cat.
What is the catalytic converter’s function and what are the A/F sensor and post cat sensor measuring.
What is affected by contaminated sensors and how do you analyse the difference between a damaged cat or contaminated sensors.
What mixture is the ECU trying to achieve and why.
A/F sensor heater circuits.
Why is the temperature carefully controlled during warm up and during operation, and how is this achieved.
What can you read from the scantool and what can you read from the oscilloscope,
and how does this assist in analysing the temperature control circuit.
How does the ECU measure the temperature in the A/F sensor to get it within 10 seconds precisely to 650° C.
How can you see if that temperature is closed loop controlled or about to fail.
A/F sensor circuit layout inside the ECU.
To understand the scantool values you have to have basic understanding of the circuit inside the ECU (16bit ADC and opamp).
The voltage measured at the sensor are very different to what the scantool displays.
How does the ECU push current to or pulls current away from the sensor.
O2 sensor inside
How is the sensor build up, and how does it produce a signal electro chemically.
The base point is that we start with explaining the old fashioned Zirconia Dioxide 1V sensor,
which during diagnostics of the overall system (Catalyst and rear O2 sensor included), becomes very important.
A/F sensor inside
Understanding the inside of the Zirconia Dioxide A/F sensor from diffusion chamber,
to ambient chamber makes for proper understanding the response time of the sensor.
How does this relate to scantool and scope readings.
Every aspect of the scantool reading related to the mixture control will be covered in depth.
The relation back to emission values and scope readings will be made.
How does calculated load, MAF volume and injection volume fit into the mixture control diagnostics,
and how does the ECU work this out. What does it mean to you and when do you recognise its wrong.
Long and Short fuel trim diagnostics.
First as a base, the old fashioned LFT and SFT on 1V Zirconia dioxide sensor systems will be covered in depth,
to make sure the LFT and SFT diagnostics on A/F sensor system is just a simple step up.
What do the adaption values mean in different fuelling modes, and what does it tell you.
A/F sensor system LFT and SFT.
What do the LFT and SFT values mean in an A/F sensor system, and how does this knowledge cross over.
What changes in those readings when something goes wrong in the engine.
How do you interpret the fault codes
We deal in detail with even the most difficult to analyse fault codes, like “P2196 Oxygen sensor stuck rich”.
A number of code triggering faults will be introduced in simulator and will have to be analysed in the class room (hands on), even a failed ECU.
A number of faults will be introduced in the mixture control which affect the drivability
(makes the vehicle surge like a e.g. a CVT or cam timing fault) and affect the emissions of the vehicle without
generating a fault code. Each fault will be analysed.
A number of different fuelling modes will be discussed, and how come that the importance of certain sensors
(and their faults) is varying per fuelling mode.
How can you see the ECU switch through several fuelling modes and how does this affect your diagnosis.
On car testing.
What can you do, to test the response rate and effectiveness of the A/F sensor on the car.
The approach is very innovative and accurate.
Analyse the mixture control, the A/F sensor, the catalyst and the rear O2 sensor without doubting.
The ECU checks for the A/F sensor for admittance, what does it mean and how can you analyse the values.
The scantool reads/calculates the two catalyst temperatures, what does it mean and what the values are used for.
As back bone of this seminar are we using a 2015 Toyota system.
In the last part of the training do we look at different brands and cross over the gained knowledge.
AECS is catering for all levels of diagnosticians, with Training, Equipment and Tech support.
Our technical help desk is our way to keep our feet on the ground and the best way to find out what problems are out there.
It helps us improve and create training seminars like the EMS 1-6. You won’t be bombarded with hours of boring theory,
nor are we doing speed training (…). Our training is practical and most of all FUN.
Hope to see you in one of our seminars this year!
Please note: this seminar is SCOPE and Scantool based. The first 'shot' in diagnostics is looking at what is happening with the scope as it takes the guess work away.
The diagnostician can bring his/her own scope and scantool, or our high speed dual channel scopes (ATS) or Launch scantools can be used.
Pre requisite: From our experience we advise that the diagnostician has completed the AED 'Automotive Electronic Diagnostic' 2 day training seminar, regardless achieved level through other training systems or experience!
After James from Toyota New Zealand attended the EMS16 training seminar in Hastings (25-Aug-16). James wrote as comment in the evaluation form that as most value to him was: "understanding the correlation between the AF sensor and OP AMP is how that is displayed on the scan tool."