Checking functions
Adapting idling speed
In exceptional circumstances e.g. customer complaints concerning droning noises, vibrations at idling speeds, it is permitted to adjust the idling speed slightly. But ensure, that the idling speed is not outside the range printed in the Exhaust emissions test binder, (if the speed is outside the tolerance range it is possible that the vehicle will fail the next exhaust emissions test).
Special tools, workshop equipment, testers, measuring instruments and auxiliary items required
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◆ Fault reader V.A.G 1551 or vehicle system tester V.A.G 1552 with cable V.A.G 1551/3
Test conditions
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● No fault stored in fault memory
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● Coolant temperature must be at least 85 °C, =>display group 04, display zone 3.
Work sequence
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‒ Connect fault reader V.A.G 1551 (V.A.G 1552). Start engine and select "Address word" 01 of engine control unit. When doing this the engine must be running at idling speed.
(Connecting fault reader and selecting engine control unit
.)
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