Renault Megane Quiz
Chassis

System operation and circuit allocation

In this manual: Chassis
Engine and peripherals — 141Chassis — 79Chassis — 72Renault Mégane III Driver's Manual — 87Electrical equipment — 221Engine and peripherals — 47Electrical equipment — 80Transmission — 14Air conditioning — 30Bodywork — 115Trim and upholstery — 44General vehicle information — 27Air conditioning — 59General vehicle information — 16Transmission — 38Sealing and soundproofing — 7General vehicle information — 3
~3min read
Fonctionnement système et affectation des voies
FONCTIONNEMENT SYSTEME

SYSTEM OPERATION

On this vehicle, the steering is assisted by an electric motor mounted on the steering column, depending on driver input. This driver input is measured by a torque sensor, which measures the effort applied by the driver to the steering wheel, and a column angle sensor. Assistance is provided by an electric motor that applies a greater or lesser torque to the steering column, in one direction or the other.

An ECU manages this assistance according to several vehicle environment parameters, including vehicle speed.

Note: When the ECU detects a fault, the level of assistance may be modified, depending on the severity of the fault.

Incorrect or missing vehicle speed information results in assistance equal to that at 40 km/h.

Note: Depending on operating conditions and on work carried out on the vehicle before ignition is switched on, power assistance may take some time to come on after the engine is started, for example after a battery disconnection or a power interruption.

Diagnostic warning light activation strategy

Service warning light flashing slowly at 2 Hz: the electric power steering system is in diagnostic mode.

Service warning light flashing rapidly at 8 Hz with the message "steering to be checked": steering wheel angle not calibrated and not indexed.

"SERVICE" warning light on steady with "steering to be checked" displayed on the instrument panel: invalid information received by the ECU.

  • assistance equal to that at a speed of 40 km/h if vehicle speed information is missing or invalid,
  • invalid steering angle sensor information: steering angle sensor not calibrated (no active reminder).

"STOP" warning light on steady with "steering fault" displayed on the instrument panel: fault in the system to be diagnosed. Contact your Techline.

Steering angle sensor indexing and initialisation

Indexing of the sensor is essential for its learning. This indexing takes effect once the steering wheel has been turned more than a quarter turn to the left, then a quarter turn to the right.

Steering angle sensor initialisation takes place after ignition is switched on. The sensor is not initialised until the steering wheel has been rotated to the left or to the right. If this rotation is not carried out, the steering wheel angle value will be given with a difference of ±1.2 degrees compared with the actual angle.

Once the sensor is initialised, this value will be given with 0.1 degree accuracy.

PIN ASSIGNMENT

Electric Power Steering ECU (black 8-way connector):

The ECU cannot be separated from the steering column assembly.

Pin 1 Not connected
Pin 2 Not connected
Pin 3 Not connected
Pin 4 CAN L1 signal (to instrument panel)
Pin 5 CAN L2 signal
Pin 6 CAN H2 signal (to instrument panel)
Pin 7 CAN H1 signal
Pin 8 + after ignition

Electric Power Steering ECU (black 2-way connector):

Pin 1 + permanent
Pin 2 Earth

Test yourself

A quick Renault Megane quiz: every answer comes with an explanation and a link to the manual page.