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7.11.2 Exhaust flaps – Checking operation of actuators
Preconditions
☑ Engine is stopped and starting disabled.
☑ Operating voltage is not applied.
WARNING
Component is hot.
Risk of burning!
• Wear protective gloves.
Checking operation of actuators – mechanically
1.
For installation position of exhaust flaps, refer to overview (→ Page 141).
2.
Remove guard plates of exhaust flaps.
3.
Check operability and ease of movement of
exhaust flaps and control linkage by moving
the assembly at the points (arrows) and
make sure that there is no excessive play.
Result:
If exhaust flap is sluggish or has too much
play: (→ Contact Service).
4.
The internal spring should pull the flap to
the fail-safe position.
• Fail-safe position for bypass flap and
EGR shutoff flap:
• Fail-safe position for donor cylinder flap:
closed.
Result:
Bypass flap / EGR shutoff flap are closed or
shutoff flap is open: (→ Contact Service).
Checking operation of actuators – electrically
1.
For installation position of exhaust flaps, refer to overview (→ Page 141).
2.
Switch on ECU.
3.
Test run of flap system is performed.
Result:
Exhaust flaps do not move: (→ Contact Service).
MS150096/01E 2012-08 | Task Description | 143
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