Fault finding - Introduction86C
4. FAULT FINDING PROCEDURE (continued)
Fault finding problems
Disconnecting the connectors and/or manipulating the wiring harness may temporarily remove the cause of a fault.
Electrical measurements of voltage, resistance and insulation are generally correct, especially if the fault is not
present when the analysis is made (stored fault).
Look for damage under the bonnet and in the passenger compartment.
Carefully check the fuses, insulators and wiring harness routing.
Look for signs of oxidation.
While manipulating the wiring harness, use the diagnostic tool to note any change in fault status from stored to
Make sure that the connectors are properly locked.
Apply light pressure to the connectors.
Twist the wiring harness.
If there is a change in status, try to locate the source of the fault.
Inspection of each component
Disconnect the connectors and check the appearance of the clips and tabs, as well as the crimping (no crimping on
the insulating section).
Make sure that the clips and tabs are properly locked in the sockets.
Check that no clips or tabs have been dislodged during connection.
Check the clip contact pressure using an appropriate model of tab.
Check the continuity of entire lines, then section by section.
Look for a short circuit to earth, to + 12 V or to another wire.
If a fault is detected, repair or replace the wiring harness.
Fault finding - Operating diagram
Layout of the main LPN* radio system components:
*LPN: Low Price NavigationCAN V M diagnostic
(Kangoo 2)Passenger electric
mirror (Trafic II ph2)
Other computersMultimedia network
(Trafic II ph2)
(Espace IV ph2,
Scénic II ph2,
compartment fuse box
ABS computer, ABS/
ESP or wheel speed
Vehicle multiplex network
Multimedia multiplex network
Fault finding - Conformity check86C
SUB-FUNCTION: USER SELECTION (CONTINUED 2)
NOTESOnly carry out a conformity check after a complete check with the diagnostic tool.
The values shown in this conformity check are given as a guide.
Application conditions: Engine stopped, ignition on.
ComputerParameter, Status checked or
ActionDisplay and notes Fault finding
interface unitET001:Activation signalACTIVE
INACTIVEIn the event of a fault, consult
ALP 2 "The multimedia
system does not switch on".
ET002:Radio on/off buttonACTIVE
DECREASEIn the event of a fault, refer to
the interpretation of status
ET005 “Silence mode”.
ET006:User profile in
NEUTRALIn the event of a fault, refer to
the interpretation of status
ET008 "Vehicle movement
PR002:Battery voltage11 V < PR002 < 14 VIn the event of a fault, refer to
the interpretation of parameter
PR002 Battery voltage.
PR003:Vehicle speed0 mphIn the event of a fault, carry out
fault finding on the ABS system
(see 38C, ABS system).
PR001:Mileage last fault
appearedIn KmThe parameter PR001
"Mileage last fault appeared"
indicates the distance travelled
since the last fault appeared.