Effectivity: 914 Series BRP-Powertrain page 7-11
OM Edition 2 / Rev. 0 April 01/2009
d04479.fm
Nominal pressure Besides the throttle position, overspeeding of the engine and too
high intake air temperature have an effect on the nominal boost
pressure.
If one of the stated factors exceeds the specified limits, the boost
pressure is automatically reduced, thus protecting the engine
against overload.
7.5.1) TCU caution lamps
Caution lamp The TCU (Turbo Control Unit) is furnished additionally with output
connections for an external “red“ boost lamp and an “orange“
caution lamp for indication of function of the TCU.
Function test
When switching on the voltage supply, the two lamps are auto-
matically subject to a function test. Both lamps illuminate for 1-2
seconds, then they extinguish. If they do not, a check as per Main-
tenance Manual is necessary.
Orange caution
lamp
If the caution lamp illuminates during the function test and then
goes off this indicates the TCU is ready for operation.
If the lamp is blinking, this indicates a malfunction of the TCU or
its periphery.
See Chapter 4.1) Abnormal operation.
Red boost lamp
- Exceeding of the admissible boost pressure will activate the
red boost lamp, being continuously illuminated.
See Chapter 4.1) Abnormal operation.
- The TCU registers the time of full throttle operation (boost
pressure). Full throttle operation for longer than 5 minutes will
make the red boost lamp blink.
See Chapter 4.1) Abnormal operation.
Non-compliance can result in serious injuries
or death!
The engine must not be taken into operation
before having corrected the cause of defi-
ciency.
The red boost lamp helps the pilot to avoid full
power operation for longer than 5 minutes as
otherwise the engine would be thermally and
mechanically overstressed.
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