MULTI - RAM System
The MULTI - RAM system is a completely new intake
system, developed from the DUAL - RAM system.
The intake manifold length is adapted to the engine by two
valves instead of one to achieve high torque over a wide engine speed range.
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1 Resonance pipe switch - over valve
2 Intake plenum switch - over valve
3 Solenoid valve for intake plenum switch - over
valve
4 Solenoid valve for resonance pipe switch - over
valve
The first valve (resonance pipe switch - over valve)
is located between the intake pipes and can connect them to each other as
required.
The second valve (intake plenum switch - over valve)
is positioned in the intake plenum.
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Function Diagram
1 Resonance pipe switch over valve
2 Intake plenum switch - over valve
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Note:
When "engine off", the resonance pipe switch -
over valve (1) is closed and the intake plenum switch - over valve (2) is
open.
Switch conditions:
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I = Idle speed:
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(1) closed, (2) open
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II = Full load, lower engine speed range:
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(1) closed, (2) closed
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III = Full load, middle engine speed range:
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(1) open, (2) closed
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IV = Full load, upper engine speed range:
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(1) open, (2) open
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Function:
The valves are regulated by the Motronic via solenoid valve.
The intake plenum switch - over valve and the resonance
pipe switch - over valve are actuated by vacuum from the solenoid valves.
Actuation of the intake plenum switch - over valve and
the resonance pipe switch - over valve lengthens or shortens the intake
distance to optimise output progression.
When the intake plenum switch - over valve is closed,
the first torque peak is attained while the engine is still in the lower engine
speed range.
The advantage over the DUAL - RAM system is the improved
adaptation.
Torque progression is even more regular and thus shift points
are undetectable over the entire engine speed range.
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Legend for illustration E 9827:
1 Resonance pipe switch - over valve
2 Intake plenum switch - over valve
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· Service
If intake manifold solenoid valve 1 or 2, the lead between
intake manifold valves 1 and 2, or intake manifold valve 1 or 2 is
defective, the engine telltale illuminates and a trouble code is stored in the
control unit:
- Trouble code 59: intake manifold solenoid valve 1
voltage high.
- Trouble code 63: intake manifold solenoid valve 1
voltage low.
- Trouble code 123: intake manifold valve 1 blocked.
- Trouble code 124: intake manifold valve 2 blocked.
- Trouble code 133: intake manifold solenoid valve 2
voltage high.
- Trouble code 134: intake manifold solenoid valve 2
voltage low.
In case of a defect, the control unit continues operating
with replacement values to ensure that the vehicle can reach the nearest
authorized Opel / Vauxhall workshop.
The intake manifold solenoid valve can be checked using
TECH 1 actuator diagnosis.
Note:
At times, components have different designations in reference
to TECH 1:
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Intake manifold solenoid valve 1:
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Solenoid valve for intake plenum switch - over valve
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Intake manifold solenoid valve 2:
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Solenoid valve for resonance pipe switch - over
valve
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Intake manifold valve 1:
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Intake plenum switch - over valve
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Intake manifold valve 2:
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Resonance pipe switch - over valve
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