Engine Management System M 2.8.1 Multi-Ram System Opel Omega B

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.

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.

Function Diagram

1 Resonance pipe switch over valve

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:

I = Idle speed:

II = Full load, lower engine speed range:

III = Full load, middle engine speed range:

IV = Full load, upper engine speed range:

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.

Legend for illustration E 9827:

1 Resonance pipe switch - over valve

· 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: