| Checking | ||
Danger! | 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 engine as it is running | Secure vehicle to prevent it from moving by itself. | |
Danger! | 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 roller dynamometer from unauthorized access. | |
Danger! | Risk of injury caused by fingers being pinched or crushed when removing, installing or aligning hoods, doors, trunk lids, liftgates or sliding roof | Keep body parts and limbs well clear of moving parts. | |
General information: Observe chassis dynamometer's performance limit. Vehicles with all-wheel drive can only be checked on a 4-chassis dynamometer. | |||
1 | Check fault memory and repair faults, if necessary | Vehicles can only be checked in faultless condition. | |
2 | Check coolant level | Check for signs of leaks. | |
3 | Check external condition and oil level of engine, transmission and driven axle(s) | Check for leaks and for noise when the engine is running. | |
4 | 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. | |
5 | Check fuel tank level | ||
6 | Mount test wheels onto driven axle(s) | To protect the vehicle tires, test wheels (not winter wheels) must be mounted. | |
7 | Set tire pressure of test wheels to specified pressure | ||
8 | Remove heat sensitive and heavy objects from the luggage compartment | ||
9 | Anchor the vehicle | With powerful vehicles (> 200 kW), increase the axle load by at least 100 kg, e.g. with sandbags, for axle measurement. 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. | |
10 | Switch off ignition | ||
11 | Open engine hood | There is a risk of falsification of the measuring results caused by insufficient cooling and ventilation. Observe 30 to 40 °C intake air temperature and max. 120 °C oil temperature. | |
12 | Connect test connections on chassis dynamometer to vehicle | Observe chassis dynamometer's operator's manual. On-board diagnosis (OBD) test procedure is to be used on vehicles as of model year 2000. | |
13 | Adjust settings on chassis dynamometer | Observe chassis dynamometer's operator's manual. Additional information is available under: e.g. www.Maha.de Rotating masses are to be taken into account: up to 17" wheels 60 kg 17 to 18" wheels 70 kg 18 to 22" wheels 80 kg | |
14 | 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. | |
15 | 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. | |
16 | Mount extractor funnel | Observe extractor funnel's operator's manual. Maintain minimum distance, otherwise damage to the rear apron may occur. | |
17 | Deactivate vehicle dynamics systems (with intervention options in engine management) | Observe the setting of the "Workshop level function" in the instrument cluster. Dynamic systems can be deactivated, e.g. by activating a check mode with non-networked systems by disconnecting the connector at 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 | ||
20 | Warm up engine, transmission, drive axle(s) and tires 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 60 °C and 80 °C (not 100 °C). | |
21 | Switch off accessory | Switched on accessories (e.g. electric steering) lead to a falsification of the measurement 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 coolant and engine oil temperature (max. 120 °C). Engine output will decrease as the intake air temperature increases. For powerful engines, this decrease may be up to 20 kW. Maintain intake air temperature 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 catalytic converter 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 | ||
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) | Dynamic systems can be activated, e.g. by deactivating a check mode, terminal 15 by connecting the connector at the hydraulic unit | |
27 | Remove extraction funnel | Observe extractor funnel's operator's manual. | |
28 | Detach chassis dynamometer's test connections from vehicle | ||
29 | Close engine hood | ||
30 | Remove vehicle anchorage | Observe operator's manual for anchorage equipment. | |
31 | Mount vehicle wheels onto vehicle | ||
32 | Check fault memory and repair faults, if necessary |
Referenced documents
- as0000z000501a Risk of accident from vehicle starting off by itself when engine running. Risk of injury (bruises and burns) resulting from working on the engine while it is being started or when it is running.
- as0000z001101a 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.
- as0000z001901a Risk of death caused by body parts being pulled in by rotating vehicle wheels and roller dynamometer rollers