Renault Megane Quiz
Engine and peripherals

Preliminary information

In this manual: Engine and peripherals
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
~4min read

1. APPLICABILITY OF THIS DOCUMENT

This document presents the diagnosis applicable to all Electronic Control Units with the following characteristics:

Vehicle(s): MEGANE II
Function concerned: Petrol injection		 ECU name: Sagem S3000
Program no.: A7
Vdiag no.: 44

2. ESSENTIAL ITEMS FOR DIAGNOSIS

Documentation type

Diagnostic methods (this document):

  • Assisted diagnosis (built into the diagnostic tool), paper (Repair Manual or Technical Note), Dialogys.

Wiring diagrams:

  • Visu-Schéma (CD-ROM), paper.

Diagnostic tool type

  • CLIP

Essential tool type

ESSENTIAL SPECIALIST TOOLS

Multimeter
Universal test lead: Elé. 1681

3. REMINDERS

Procedure

To diagnose the vehicle control units, switch the ignition to diagnostic mode (+ after forced ignition).

Proceed as follows:

  • badge the vehicle on the badge holder (keyless vehicle scenario 1, entry level, without hands-free, and scenario 2, high end, hands-free),
  • press and hold the start button (more than 5 seconds) outside starting conditions,
  • connect the diagnostic tool and carry out the required operations.

Note: The left and right xenon lamp control units are powered when the dipped beam lights are switched on.

Their diagnosis is therefore only possible after switching the ignition on in diagnostic mode (or after forced ignition) and switching on the dipped headlights.

To cut the + after ignition (+AC), proceed as follows:

  • disconnect the diagnostic tool,
  • press the start button twice briefly (less than 3 seconds each time),
  • check that the + after ignition supply is cut by the ECU warning lights going out on the instrument panel.

Faults

Faults are reported as either present or stored (having occurred under certain conditions and since disappeared, or always present but not diagnosed under the current conditions).

The present or stored state of faults must be considered when the diagnostic tool is connected after switching on the + after ignition (without operating any components of the system).

For a present fault, apply the procedure given in the Fault Interpretation chapter.

For a stored fault, note the displayed faults and apply the Instructions section.

If the fault is confirmed by applying the instructions, the fault is present. Treat the fault.

If the fault is not confirmed, check:

  • the electrical circuits corresponding to the fault,
  • the connectors of these lines (corrosion, bent pins, etc.),
  • the resistance of the component detected as faulty,
  • the condition of the wiring (melted or cut insulation, chafing).

Conformity check

The conformity check aims to verify states and parameters that do not show a fault on the diagnostic tool when they are inconsistent. This step therefore allows:

  • diagnose faults with no fault display that may correspond to a customer complaint,
  • verify correct operation of the system and make sure a fault will not reappear after repair.

This chapter therefore contains a diagnosis of states and parameters, under the conditions required for their check.

If a state does not operate normally or a parameter is out of tolerance, refer to the corresponding diagnostic page.

Customer symptoms - Fault location tree

If the diagnostic tool check is correct but the customer complaint is still present, treat the problem using Customer symptoms.

A summary of the overall procedure is available as a flowchart on the following page.

4. DIAGNOSTIC PROCEDURE

Préliminaires

5. DIAGNOSTIC SHEET

WARNING: Every fault on a complex system must be subject to a complete diagnosis using the appropriate tools. The DIAGNOSIS SHEET, to be completed during the diagnosis, provides and keeps a record of the diagnosis performed. It is an essential part of the dialogue with the manufacturer. A DIAGNOSIS SHEET MUST THEREFORE BE COMPLETED EACH TIME A DIAGNOSIS IS PERFORMED

This sheet will always be required:

  • when requesting technical assistance from Techline,
  • for approval requests, when replacing parts that require mandatory approval,
  • to attach it to the "under observation" parts requested on return. It then conditions the warranty refund and contributes to a better analysis of the removed parts.

6. SAFETY INSTRUCTIONS

Any operation on a component requires the application of safety rules to avoid material damage or injury.

  • check that the battery is properly charged to prevent damage to the ECUs in case of low charge,
  • use the appropriate tools.

7. DIAGNOSIS

Stored fault management

Stored fault management is identical for all sensors and actuators.

A stored fault is erased after 128 starts without the fault reappearing.

Test yourself

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