Renault Megane Quiz
Engine and peripherals

Preliminaries

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
~8min read

1. APPLICABILITY OF THIS DOCUMENT

This document describes the diagnosis applicable to all electronic control units with the following characteristics:

Vehicle(s): MEGANE II
Function concerned: DIRECT DIESEL INJECTION
COMMON RAIL K9 DELPHI (DDCR)		 ECU name: DDCR INJECTION
Program no.: BE88
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-Diagram (CD-ROM), paper.

Diagnostic tool type:

  • CLIP

Essential tool type:

Essential special tools

Multimeter
Ele. 1590 112-way ECU connector block

3. REMINDERS

Procedure

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

Proceed as follows:

  • Place the vehicle key on the key holder (vehicles without key scenario 1, entry level, without hands-free and scenario 2, high end, with hands-free),
  • long press (more than 5 seconds) on the "start" button 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,
  • briefly press the "start" button twice (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 fault that is present, follow the procedure given in the Fault interpretation section.

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

If the fault is confirmed by applying the instruction, the fault is present. Repair the fault.

If the fault is not confirmed, check:

  • the electrical circuits corresponding to the fault,
  • the connectors of these lines (oxidation, bent pins, etc.),
  • the resistance of the component detected as faulty,

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,
  • to check that the system operates correctly and to make sure that the 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 complaints - Fault locating tree

If the diagnostic tool check is correct but the customer complaint is still present, deal with the problem using symptom-based diagnosis.

A summary of the overall procedure is shown as a flowchart on the next page.

4. DIAGNOSTIC PROCEDURE

Préliminaires

5. DIAGNOSTIC SHEET

WARNING

All incidents on a complex system must be subject to a full diagnosis using suitable tools. The DIAGNOSTIC SHEET, to be completed during diagnosis, provides and keeps a record of the diagnosis carried out. It is an essential element of communication with the manufacturer.

A DIAGNOSTIC SHEET MUST BE COMPLETED EVERY TIME A DIAGNOSIS IS PERFORMED.

This sheet will always be requested:

  • When requesting technical assistance from the techline.
  • For approval requests, when replacing parts that require mandatory approval.
  • To be attached to the "monitored" parts returned. It is then required for warranty reimbursement and helps with a better analysis of the removed parts.

6. SAFETY INSTRUCTIONS

Any work on a component requires compliance with safety rules to avoid any material or personal injury:

  • Check that the battery is correctly charged to avoid damage to the ECUs in case of low charge.
  • Use the appropriate tools.

CLEANLINESS RULES THAT MUST BE STRICTLY OBSERVED WHEN WORKING ON THE HIGH-PRESSURE DIRECT INJECTION SYSTEM

Risks related to contamination

The system is very sensitive to contamination. The risks caused by introducing contamination are: damage or destruction of the high-pressure injection system and of the engine, seizure or leakage of a component.

All after-sales work must be carried out in very clean conditions. Working in very clean conditions means that no impurities (particles of a few microns) have entered the system during its disassembly or into the circuits through the fuel fittings.

Cleanliness principles must be applied from the filter through to the injectors.

6. SAFETY INSTRUCTIONS (CONTINUED)

BEFORE ANY WORK ON THE INJECTION SYSTEM, MAKE SURE THE PRESSURE IN THE SYSTEM IS CLOSE TO 0 BAR.

What are the contaminating elements? The contaminating elements are:

  • metal or plastic swarf,
  • paint,
  • fibres:
  • cardboard,
  • from brush bristles,
  • from paper,
  • from clothing,
  • cloth fibres.
  • foreign bodies such as hair,
  • ambient air,
  • etc.
WARNING

Never clean the engine with a high-pressure cleaner, as this may damage the connectors. In addition, moisture can collect in the connectors and cause electrical connection problems.

Precautions to observe before any work on the injection system

Make sure you have the caps for the fittings to be opened (bag of caps sold at the Spare Parts Store, reference 77 01 206 804). The caps are single-use. After use, the caps must be discarded (once used they are contaminated, and cleaning is not enough to make them reusable). Discard any unused caps.

Make sure you have resealable plastic bags for storing the parts that will be placed in them. This reduces the risk of contamination of the stored parts. The bags are single-use; once used, they must be discarded.

Make sure you have lint-free cleaning wipes (reference 77 11 211 707). Using ordinary cloth or paper to clean is prohibited, as they shed lint and can contaminate the fuel system circuit. Each wipe may only be used once.

Precautions to observe before opening the fuel circuit

Use new solvent every time you carry out a job (used solvent contains contaminants). Pour it into a container that is free of contaminants.

Use a clean brush in good condition for every operation (the brush must not shed its bristles).

Clean the fittings to be opened using the brush and solvent.

Blow the cleaned areas dry with compressed air (tools, workbench, and parts, fittings and injection system area). Check that no brush bristles remain.

Wash your hands before and during the operation if necessary.

When wearing protective gloves, cover leather gloves with latex gloves.

Precautions to observe during the job

As soon as the circuit is opened, you must plug all openings through which contamination could enter. The plugs to be used are available from the Spare Parts Store. They must never be reused.

Reseal the bag tightly, even if it has to be reopened shortly afterwards. Ambient air is a source of contamination.

Any injection system component that has been removed must, after being plugged, be stored in a sealed plastic bag.

Once the circuit has been opened, the use of a brush, solvent, air blower, swab or ordinary cloth is strictly prohibited, as these items may introduce contaminants into the system.

When replacing a component, remove the new component from its packaging only when fitting it to the vehicle.

7. ABBREVIATIONS GLOSSARY

12 Volts APC: 12 Volts After Contact (ignition on).
12 Volts AVC: 12 Volts Before Contact (battery supply).
ABS: Anti-lock Braking System.
BVA: Automatic Gearbox.
C2I: Individual Injector Correction.
CAN: Controller Area Network.
COSLAD: Headlamp levelling for gas discharge lamps (xenon lamps).
EGR: Exhaust Gas Recirculation.
ESP: Electronic Stability Program.
GMV: Engine Cooling Fan Unit.
PMH: Top Dead Centre (TDC).
PMB: Bottom Dead Centre (BDC).
POWER LATCH: Power supply maintained phase.
RCH: Cabin Heating Resistor.
UCH: Cabin Central Unit.
UPC: Protection and Switching Unit.
VIN: Vehicle Identification Number.

Test yourself

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