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| Pull out servotronic control unit -J236-, position 2. |
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| Set digital multimeter -V.A.G 1526- to resistance test range (up to 200 Ohm). |
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| Measure between contacts 2 and 5 at plug connector for control unit. |
Specification: 5 to 20 Ohm. |
If specification is not attained: |
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| Detach electrical connector for servotronic solenoid valve (in wheel housing on left side). |
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| If electrical wiring is OK up as far as connector (in wheel housing on left-side), remove steering box. |
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| Vehicles with moulded connecting cable on servotronic solenoid valve: renew solenoid valve. |
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| Vehicles not fitted with moulded connecting cable on servotronic solenoid valve: unplug connector and check for short circuit or open circuit in connecting cable. |
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| If connecting cable is OK, renew servotronic solenoid valve. |
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