Preliminaries

1. APPLICABILITY OF THIS DOCUMENT

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

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:

3. REMINDERS

Procedure:

To diagnose the vehicle's computers, put the ignition in diagnostic mode (+ after forced ignition), i.e. proceed as follows:

• Place the vehicle card on the card holder (vehicles without keyless scenario 1, entry level, without hands-free, and scenario 2 (top of range, hands-free)),
• Press and hold the "start" button (more than 5 seconds) outside starting conditions,
• Then connect the diagnostic tool and carry out the required operations.

Important: The left and right xenon lamp computers are powered when the dipped beams are switched on. Their diagnosis is therefore only possible after putting the ignition in diagnostic mode (+ after forced ignition) and switching on the dipped beams.

To switch off the +after ignition, proceed as follows:

• Disconnect the diagnostic tool,
• Briefly press the "start" button twice (less than 3 seconds each time),
• Check that the +after ignition forced is switched off by the computer warning lights on the instrument panel going out.

Faults:

There are declared faults present and stored faults (occurred in a certain context and since disappeared, or always present but not diagnosed in the current context).

The "current" or "stored" fault status must be checked when starting the diagnostic tool after switching on ignition (without operating any components of the system).

For a present fault, deal with the fault using the procedure given in the chapter "Fault interpretation".

For a stored fault, record the displayed faults and follow the instructions in the "Instructions" section.

If the fault is confirmed when the instruction is applied, the fault is present. In this case, repair the fault.

If the fault is not confirmed, carry out the basic checks. To do so, check:

• The electrical lines 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 the states and parameters that show no fault on the diagnostic tool when they are inconsistent. This step therefore allows you to:

• 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 effects - Fault location tree: If the diagnostic tool check is correct but the customer complaint is still present, deal with the problem using "customer effects".

4. DIAGNOSTIC PROCEDURE

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.

This sheet will always be requested:

• When requesting technical assistance from the techline.
• For approval requests, when replacing parts that require mandatory approval.
• To attach it to the "under surveillance" parts requested on return. It is then required for the warranty refund of the part and helps with better analysis of removed parts.