Diesel Engines, Performing Emissions Test
The following description applies to vehicles that are equipped with "On - Board - Diagnostic" OBD.
OBD monitors all components and partial systems that influence the emissions quality.
Special tools and workshop equipment required
An emissions test is only possible when all units of the Emissions Testing Station:VAS 6300 are connected properly according to operating instructions and are connected to each other.
All procedures are displayed on the Emissions Testing Station:VAS 6300 .
Test Requirements
- All of the test conditions and data required for the emissions test are on the emissions testing data sheet for the corresponding engine.
- If a barcode input of the emissions testing specification data is going to be performed, the emissions testing data sheet must be available as a paper printout.
- Automatic transmission: selector lever in "P" or "N" position.
- Manual transmission: gearshift lever in neutral.
- Parking brake applied
-- Follow the instructions in the display.
Start Screen
-- Select the "Emissions test" button -arrow-.
An overview for selecting the respective emissions test type appears.
-- Select "Emissions testing, diesel" -arrow-.
Display for the warm-up time appears.
-- Continue the emissions test according to the instructions on the display.
-- When the selection for the emissions test specified value appears, select the corresponding "Selection for emissions test specified value" -arrow-.
- Either for a first-time emissions test "Standard specification values",
- Or, if an already performed emissions test is to be performed again "last vehicle".
-- Select Continue -item 1- on the display.
Vehicle Data Input
The vehicle data input menu appears.
-- Enter the following data from part 1 of the certificate of registration.
- -1- Vehicle manufacturer: "for example, AUDI"
- -2- Vehicle model: "for example, A6 / 4G"
- -3- Key number for 14.1: "for example, 0572"
- -4- Key number for 2.1: "for example, 0588"
- -5- Key number for 2.2: "for example, 846"
- -6- Engine code "for example, CHVA"
- -7- License plate: "for example, IN-MV 1234"
- -8- VIN: "for example, WAUZZZ4GZAN001234"
-- Enter the odometer reading "for example, 33350" at -item 9-.
Use the GO TO button to start other functions.
Use the GO TO button to cancel the test.
-- Select "Diesel OBD" -arrow-.
Emissions Test Specified Data Input
The specified data can be entered in different ways.
- 1. Manually
- 2. Via barcode input from emissions testing data sheet
- 3. Via ELSA web service
In order to be able to use the ELSA web service, the Vehicle Diagnostic Tester that is used to perform the emissions test must be integrated in the workshop network.
When using ELSA Web service, the vehicle specification data is automatically transferred via the network into the appropriate form.
Manual Emissions Test Specified Data Input
All test conditions and data (refer to the appropriate Service Information) required for the emissions test for the corresponding engine.
-- Follow the instructions on the display for manual data input.
-- Enter the values under "Test values for the emissions test" on the emissions testing data sheet on the display in the following sequence:
- Speed for Conditioning
- Number of Throttle Bursts for Conditioning
- Engine Oil Temperature (Minimum Value)
- Select Method for Measuring Engine Oil Temperature
- Idle Speed
- Speed Regulation
- Speed Regulation Measured Time (1 second)
- Turbidity Value (Arithmetic Mean)
- Select the Sensor Type (Number of Sensors)
- Select the Measuring Mode.
- Measurement Time Amount
-- Press the → button -arrow- once all the data has been entered correctly.
Emissions Test Specified Data Input as Barcode
-- If the emissions test specified data is available as a bar code, scan in the bar code of emissions testing data sheet using bar code reader.
The display -1- with all the required data appears on the screen.
-- Press the → button -arrow- to continue.
Visual inspection
-- Follow the instructions on the display.
-- Visually inspect all emissions-related components.
-- Check the exhaust system for completeness, leaks and damage.
-- If the visual inspection is OK, press the "OK" button -arrow-.
A test starts by pressing the NOT OK button.
Diagnostic Connector, Connecting
- Ignition is switched off.
In the visual inspection display, the prompt to connect the diagnostic connector -arrow A- and to check the "malfunction indicator lamp" (MIL) -arrow B- appears.
-- Follow the instructions on the display.
-- Connect the diagnostic cable connector to the EOBD connection.
Visual Inspection of the malfunction indicator lamp with engine off
-- Turn on the ignition.
-- Visually inspect the "Malfunction Indicator Lamp".
-- When the lamp turns on, press the "Lamp On" button -arrow C-.
If the malfunction indicator lamp does not come on during the visual inspection, the result of the emissions is "failed".
Visual Inspection of Malfunction Indicator Lamp with Engine Running
-- Start the engine and confirm the engine is running via "Yes" on the display.
-- Visually inspect the "malfunction indicator lamp". The lamp must no longer turn on or blink.
-- Confirm the "malfunction indicator lamp" status -arrow-.
The program automatically advances to the test-readiness check.
Here it is tested whether all test-readiness checks supported by the control module have been run through.
Conditioning
During the conditioning phase, the engine and any emissions control system are brought to operating temperature via throttle bursts and are thus prepared for the emissions test.
-- Follow the instructions on the display.
-- Maintain the engine speed in the required RPM range.
If it is certain that no conditioning is required, press the → button -arrow- to advance to the next measurement.
Engine Temperature, Reading Out
The engine temperature is read out from the engine control module via the diagnostic connector.
After reaching the required engine temperature, the program automatically advances to the display for measuring the idle speed.
Idle Speed Measurement
-- Follow the instructions on the display.
Measurement begins when engine speed has reached the necessary level.
Do not insert the exhaust probe into the tail pipe yet.
Using the → button, the measurement can be skipped, that is, the emissions test will not be passed.
Press the ← button to repeat the test.
-- Maintain the engine speed in the required RPM range.
The remaining time for performing the measurement is displayed -arrow-.
Speed Regulation Measurement
The program automatically advances to the display for measuring the speed regulation.
Measurement begins when engine speed has reached the necessary level.
-- Press the accelerator pedal until the measurement is completed. To do so, press the accelerator pedal downward immediately.
If the engine speed limitation is set, then deactivate it for the emissions test:
Turn on the ignition and then press the ESP button until the corresponding symbol in the instrument cluster blinks.
The remaining time for performing the measurement is displayed -arrow-.
Do not insert the exhaust probe into the tail pipe yet.
Using the → button, the measurement can be skipped, that is, the emissions test will not be passed.
Fresh Air Comparison
A fresh air comparison is started before free acceleration. The exhaust probe must never be in the tail pipe for this. Otherwise, measurement errors or error messages may result during the following measurements.
-- After completing the fresh air comparison, insert the exhaust probe into the tail pipe.
Free Acceleration
The program automatically advances to the display for "Free acceleration".
During "free acceleration", the engine is accelerated without load as quickly as possible to the speed regulation.
The "free acceleration" test consists of a minimum of four individual accelerations.
Free Acceleration - Phase 1
-- Follow the instructions on the display -arrow A- and -arrow C-.
-- Maintain the idle speed in the specified speed range -arrow D-.
The remaining time for completing the measurement is displayed -arrow B-.
The exhaust probe must be in the tail pipe.
If the speed deviates from the speed range entered, the measurement begins again.
Using the → button, the measurement can be skipped, that is, the emissions test will not be passed.
Free Acceleration - Phase 2
-- Follow the instructions on the display -arrow B-.
-- When prompted to accelerate, press the accelerator pedal all the way down and hold until the prompt to idle appears on the display.
Free Acceleration - Phase 3
-- Take the foot off the accelerator pedal as soon as the prompt for idle is shown on the display -arrow B- and let engine run at idle.
The result of the measurement, as well as information about the "free acceleration" just performed appears on the display -arrow A-. If the checked values are not OK, information regarding the causes of the "free acceleration" not being OK are listed.
A white-colored field indicates that the measured value is within the tolerance.
A red-colored field indicates that the measured value is not within tolerance.
A yellow field indicates that the measured value is outside the tolerance range, however this can be evaluated by the operator.
Additional Individual Accelerations
The next individual acceleration begins again with phase 1 of "Free Acceleration".
So many "free accelerations" can be performed until:
- Three "free accelerations" have passed one after another and the acceleration range is OK during this.
- All the values are OK except the acceleration range; press the → button -arrow C- to continue the test sequence. (The decision of whether the value is OK is made in this case by the operator.)
- The values are not OK; press the button -arrow C- to end/bypass the measurement.
If all measured values are OK after three consecutive accelerations - that is, all fields are white - the emissions test has been passed.
If all measured values are OK after three consecutive accelerations - the emissions test has been passed.
Evaluation
After the emissions test is completed, the log is displayed on the screen.
The test result is displayed.
Explanations regarding the emission test can be entered here -arrow A- and can be entered into the test report.
-- If the emissions test was passed, select emissions test label assigned in the drop-down menu -arrow B- and the date.
-- Then confirm with "Yes" -arrow C-.
The emissions test log is shown in the display and can be printed as many times as needed in the "print preview" menu via the "Print" button -arrow A-.
-- Pressing the "Close" button -arrow B- closes the "print preview" menu.
-- Follow the instructions on the display.
-- Remove the exhaust probe from the tail pipe.
-- Press the → button -arrow B-
The emissions test is complete. A new emissions test can be started.