Servicing injection system
Checking engine operating mode
Note:
Check whether engine control unit recognises the engine operating modes (idling speed, part throttle, full throttle, overrun).
Special tools, 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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● Coolant temperature at least 80 °C
Test 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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