Vdiag No: C4RADIO
Fault finding - Introduction86A
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 - Fault Finding Chart
*LPN: Low Price Navigation
ALP 1 No dialogue with the LPN* computer
NOTESStart the engine.
Use the wiring diagrams Technical Note for Scénic II ph2, Espace IV ph2,
Trafic II ph2 or Kangoo 2.
Important: After activating the system, the delay before establishing dialogue can last
Try the diagnostic tool on another vehicle.
Is dialogue possible with a computer?
On the defective vehicle.
Check the voltage of the battery.
Check the condition and connection of the battery
Check the condition of the fuses.
–the connection between the diagnostic tool and
the diagnostic sensor (wiring in good condition),
–the connection between the diagnostic sensor
and the diagnostic socket (wiring in good
AFTER REPAIRCarry out a complete check with the diagnostic tool.
Vdiag No.: C4