| Self-diagnosis of the power-steering |
| The power steering of TRW or KOYO can be checked with the self-diagnosis. Performing the self-diagnosis is identical on both steering systems. |
| The self-diagnosis can be carried out: |
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| using the vehicle system tester -V.A.G 1552-, or the fault read-out scan tool -V.A.G 1551- → Chapter |
| The control unit and the hydraulic unit (eletric motor and gear pump) as well as the hydraulic oil reservoir form a single unit, the so-called engine pump aggregate, which cannot be disassembled. Only the reservoir for hydraulic oil is replaceable. |
| The engine pump aggregate is located in the front left of the engine compartment between the bumper and the wheelhouse. |
| Self-diagnosis is related to the electrical and electronic parts of the power-assisted steering. The control unit detects faults during the operation of the vehicle and stores them in a permanent memory, whose information is retained even if the battery voltage is disconnected. |
| After the ignition is switched on the servotronic warning light -K92- lights up. As soon as this starts an internal check cycle is completed → Chapter. |
| Before starting fault finding, always initiate self-diagnosis. If faults are stored in the fault memory, these can be displayed or be printed out with vehicle system tester -V.A.G 1552-, the fault read-out scan tool -V.A.G 1551- or the vehicle diagnosis, measurement and information system -VAS 505x-. |
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