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Checking |
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Risk of accident
caused by vehicle starting off by itself when engine is running. Risk of injury
caused by contusions and burns during starting procedure or when working near the running engine |
Secure vehicle to prevent it from moving by itself.
Wear closed and snug-fitting work clothes. Do not grasp hot or rotating parts. |
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Risk of death
caused by body parts being pulled in by rotating vehicle wheels and roller dynamometer rollers |
Do not insert your hand into rotating parts.
Wear closed and snug-fitting work clothes.
Safeguard areas with rotating vehicle parts and dynamometer rollers against unauthorized access.
Safeguard roller dynamometer from unauthorized access. |
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Risk of injury
caused by fingers being jammed or pinched
when removing, installing or aligning hoods, doors, trunk lid/ rear-end door or sliding roof. |
When moving components, ensure that no body parts or limbs are within the operating range of moving parts. |
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General information |
Observe chassis dynamometer's performance limit.
Vehicles with all-wheel drive can only be tested on a 4-chassis dynamometer. |
| 1 |
Check coolant level |
Check for signs of leaks. |
| 2 |
Check external condition and oil level of engine, transmission and driven axle(s) |
Check for leaks and for noise when the engine is running. |
| 3 |
Check engine oil change interval |
The engine oil change interval must not be exceeded. An engine oil and filter change must otherwise be carried out subject to a special charge.
On vehicles fitted with maintenance interval display it is only necessary to change the engine oil if this is indicated. |
| 4 |
Check fuel tank level |
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| 5 |
Mount test wheels onto driven axle(s) |
To protect the vehicle tires, test wheels (not winter wheels) must be mounted. |
| 6 |
Set tire pressure of test wheels to specified pressure |
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| 7 |
Remove heat sensitive and heavy objects from the luggage compartment |
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| 8 |
Anchor the vehicle |
The anchoring must be taut but not pull the vehicle down.
Observe operator's manual for anchorage equipment.
Anchorage equipment such as, e.g. tensioning straps, chains or pull-down devices are available as accessories from the manufacturer of the chassis dynamometer. |
| 9 |
Switch off ignition |
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| 10 |
Open engine hood |
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| 11 |
Connect test connections on chassis dynamometer to vehicle |
Observe chassis dynamometer's operator's manual. |
| 12 |
Adjust settings on chassis dynamometer |
Observe chassis dynamometer's operator's manual. |
| 13 |
Enter vehicle data into chassis dynamometer |
Use guideline values from the owner's manual, passenger car sales pocket book or registration certificate. There is no direct relationship to the flywheel mass output values.
It may be that the rated output is not reached during the test, this is because control mechanisms run in the background to protect the engine and drive train. To this end, a reference vehicle must be used to determine the guideline values.
Observe chassis dynamometer's operator's manual. |
| 14 |
Direct air flow of cooler blower to radiator and vehicle underside (oil pan, transmission, axles, exhaust, catalytic converter and tires) |
To avoid engine damage, make sure that the engine does not overheat.
Keep the cooler blower (minimum output 15, 000 m3
/h) approx. 1 meter from the vehicle.
Observe cooler blower's operator's manual. |
| 15 |
Close engine hood |
If the engine hood is open, there is a danger that the wiring and the plastic and rubber lines will be damaged. Furthermore there is the risk of corruption of the measurement results due to inadequate cooling and ventilation. |
| 16 |
Mount extractor funnel |
Observe extractor funnel's operator's manual. |
| 17 |
Deactivate vehicle dynamics systems (with intervention options in engine management) |
Vehicle dynamics systems can be deactivated
- e.g. by activating a test mode
- or in non-networked systems by detaching the connector to the hydraulic unit
Despite these measures it may be that the rated output is not reached; this is because additional control mechanisms run in the background to protect the engine and drive train. |
| 18 |
Start exhaust gas extraction |
Observe operator's manual for exhaust gas extraction. |
| 19 |
Start engine |
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| 20 |
Heat up engine, transmission and drive axle(s) under partial load (selector lever position "S" or 3rd gear) at approx. 25 kW |
In the event of complaints in the starting or warm-up phase, do not bring the engine up to operating temperature, but proceed in a complaint-related manner.
Keep engine oil temperature between 80°C and 100°C. |
| 21 |
Switch off accessory |
Accessories that are switched on will tend to falsify the measuring results. |
| 22 |
Check gear capacity |
Full-throttle tests are to be performed directly after the engine has been warmed up, when the temperature of the tires is still low, because temperature rises fastest during these tests.
Adhere to the user guidance for the chassis dynamometer.
Only carry out the test for as long as is required to read off the instrument clusters and store the data.
Observe the coolant and engine oil temperature.
Engine output will decrease as the temperature of the intake air increases. For powerful engines, this decrease may be up to 20 kW.
Do not exceed engine oil temperature of 130°C as this can lead to engine damage.
On vehicles fitted with catalytic converters, the test must be stopped immediately if combustion problems occur, otherwise damage to the TWC cannot be ruled out. |
| 23 |
Print out measured values, store and evaluate |
Compare and evaluate the actual values with the specified guideline values in the operator's manual, passenger car sales pocket book or registration document or against the measured values of a reference vehicle.
The specified statements of power output in the registration document are determined in accordance with the EU guidelines and should not be directly compared with the measurement result.
Two retests are permitted after adjustment operations. Before any further testing can be done, a break (45 minutes) must be taken to allow the components to cool down. |
| 24 |
Switch off ignition |
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| 25 |
Switch off exhaust gas extraction |
Observe operator's manual for exhaust gas extraction. |
| 26 |
Activate vehicle dynamics systems (with intervention options in engine management) |
Vehicle dynamics systems can be activated
- e.g. by deactivating a test mode
- by plugging in a connector to the hydraulic unit
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| 27 |
Remove extraction funnel |
Observe extractor funnel's operator's manual. |
| 28 |
Open engine hood |
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| 29 |
Detach chassis dynamometer's test connections from vehicle |
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| 30 |
Close engine hood |
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| 31 |
Remove vehicle anchorage |
Observe operator's manual for anchorage equipment. |
| 32 |
Mount vehicle wheels onto vehicle |
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| 33 |
Read out fault (DTC) memory, and clear it if necessary |
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