DescriptionThe Electrical Power Steering (EPS) system reduces the effort required to steer the car by using the torque produced by an electric motor.An electronic control unit manages and controls the system: by processing the incoming information and using a preset operating logic the control unit determines the direction of rotation and the supply current for the electric motor producing the desired power-assisted effect.It is possible, using the special CITY button located in the control panel in the centre of the dashboard,to alter the level of power assistance for the electric steering.On the instrument panel, there is the electric power steering fault warning light; When the CITY function is on this is shown by a special warning light in the instrument panel. For more details 2398694Characteristic of working principle4110STEERING CONTROL AND LINKAGE . The control unit supply lines are protected by a special maxifuse located in the engine bay control unit. ignition-operated power supply from a special fuse in the engine compartment control unit.
Functional description The electric power steering control unit M86 monitors and controls the entire electric driving system electrically. The control unit is supplied directly by the battery via a line protected by fuse F2 of the engine compartment junction unit B1 at pin A of connector A of M86. Pin B of connector A of M86 is earthed. The supply controlled by the ignition (15/54) reaches pin 1 of connector B of M86 from the line protected by fuse F24 of the engine compartment junction unit B1. Control unit M86 is connected to the CAN pins 5 and 6 of connector B with the other nodes, particularly the Body Computer M1 and the instrument panel E50 to which it sends the signals for the electric steering failure warning light. The CITY mode (less effort to turn the wheel) selection button is located in tunnel switch unit H35; the engagement earth signal for the function reaches the control unit M86 via the CAN through the Body Computer M1, pin 19 of connector D. The information that the CITY function is on is also sent to the instrument panel E50 which lights up the CITY warning light. The self-test data can be read by connecting to connector C of the Body Computer M1 pin 9: it receives the signals from pin 4 of connector B of M86 via the specific tester line: pin 11 of connector H: M1 SeeE8010 DIAGNOSTIC MULTIPLE CONNECTOR .
<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting21Open the bonnet lid.1. Release the retainers (1a) and remove the cover (1b).2050746
<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting212400802-7040A37fuse box cover - r r1. Disconnect the electrical connections (1a, 1b, 1c, 1d, 1e, 1f).2. Undo the bracket retaining bolt.3. Slightly move the bracket (3a) for the dashboard trim and undothe bolt (3b).4. Undo the other bolts securing the body computer/junction unit.5. Slightly move the body computer/junction unit assembly.6. Disconnect the electrical connections (6a, 6b, 6c).7. Recover the body computer/junction unit.2050752
<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting211. Disconnect electronic control unit electrical connections (1a),(1b), (1c).2. Undo the bolts.3. Recover the control unit.2050753
<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting211. Disconnect electronic control unit electrical connections (1a),(1b), (1c).2. Undo the bolts.3. Recover the control unit.2050754
<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting211. Remove the front sound insulation (1a) and the rear sound insulation(1b).2051130
<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting212400395-3380A44handbrake/linkage protection- r+rMove the front seat forward to the endof its travel.1. Move panel (1a) by undoing retainers (1b) and then retainers(1c).2. Disconnect the electrical connection.3. Undo the rear bolts.2051131
7040L37
<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting211. Move panel (1a) slightly and undo retainers (1b).2051133
<anchor>0</anchor><span>Removing</span><icon><imageid>20</imageid></icon>1Refitting212400802-7040A37fuse box cover - r r (onlyfor left connector) 1. Only for left connector Release bonnet lid opening handle (1a)from rotating housing (1b). 2. Undo the bolts.3. Remove connector (3a) by undoing internal retainer (3b).2051137
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