7.21.6 Engine Control Unit – Self-test
DANGER
Electric voltage supply for operation.
Danger of burns and fatal electric shock!
• Make certain that the power supply to the product is switched off before starting work. Secure
against unintentional switching on!
ECU7 self-test
1.
Switch off power supply to system.
2.
Remove connectors X1, X2 and X4 from
the Engine Control Unit.
a) Release lock (3) of connectors (2).
b) Unplug connector (2).
3.
Switch on power supply
Result:
• The Engine Control Unit is operable if
the diagnostic lamp (1) changes to con-
tinuous illumination within 30 seconds
after power has been switched on.
• If the diagnostic lamp (1) flashes after
30 seconds, replace Engine Control Unit
and (→ contact Service).
• Check the power supply if the diagnostic
lamp remains dark.
4.
Switch off power supply.
5.
Refit connectors X1, X2 and X4 on Engine
Control Unit.
a) Plug in connector (2).
b) Lock connectors.
M015655/05E 2015-06
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