Mono-Motronic injection and ignition system
Checking engine operating mode
Engine codes ABU, AEA only
Note:
Check establishes whether Mono Motronic control unit (J257) recognises the engine operating modes (idling, part throttle, acceleration/full throttle enrichment, full throttle and overrun).
Special tools, testers and auxiliary items
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◆ Fault reader V.A.G 1551 or vehicle system tester V.A.G 1552 with
▸ 07.93: Cable V.A.G 1551/1
08.93 ▸: 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) and select engine electronics control unit (address word 01); carry out selection at idling.
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