| If the speed display on the speedometer is faulty, one must check whether the speedometer signal is present. |
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| Connect vehicle system tester -V.A.G 1552- → Chapter. |
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| Select the display group 001 and conduct a test drive. |
| If the speed is indicated in the display of the vehicle system tester -V.A.G 1552-, the dash panel insert is defective and must be replaced. |
| If also no speed display appears in the display of the vehicle system tester -V.A.G 1552-, the signal must be tested on the multi-pin connection on the dash panel insert. |
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| Connect the test box -V.A.G 1598- with the adapter -V.A.G 1598/25- to the blue 32 pin connector. |
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| Use multimeter -V.A.G 1526 A- to measure the voltage between the chamber 28 and the vehicle mass. |
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| Roll the vehicle slightly forward and backward. |
| The voltage must rise from 0 V to approx. 12 V and drop again to 0 V (pulsating direct current voltage). |
| If the specified values were not reached, the wiring to the vehicle speed sender must be tested. |
| If the wiring is O.K., the vehicle speed sender must be replaced. |
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