PETROL INJECTION
Fault finding - Introduction
17B-4
17B
PETROL INJECTION
Fault finding - Introduction
17B-4
17B
V9 MR-372-J84-17B050$047.mif
S3000 Injection
Program No.: AD
Vdiag No.: 4C / 54
4. FAULT FINDING PROCEDURE
Check the battery charge and
condition of the fuses
Print the system fault finding log
(available on CLIP and in the
Workshop Repair Manual or
Technical Note)
Connect CLIP
no
Dialogue with
computer?
yes
Read the faults
no
Faults present
yes
Deal with present faults
Deal with stored faults
no
The cause is still
presentFault
solved
yes
See ALP 1
Conformity check
no
The cause is still
presentFault
solved
yes
Use Fault Finding Charts (ALPs)
no
The cause is still
presentFault
solved
yes
Contact Techline with the
completed fault finding log
PETROL INJECTION
Fault finding - Introduction
17B
17B-5
PETROL INJECTION
Fault finding - Introduction
17B
17B-5V9 MR-372-J84-17B050$047.mif
S3000 Injection
Program No.: AD
Vdiag No.: 4C / 54
4. FAULT FINDING PROCEDURE (continued)
Wiring check:
Fault finding problems:
Disconnecting the connectors and/or manipulating the wiring may temporarily remove the cause of a fault.
Electrical measurements of the voltage, resistance and insulation are generally correct, especially if the fault is not
present when the analysis is made (stored fault).
Visual inspection:
Look for damage under the bonnet and in the passenger compartment.
Carefully check the fuses, insulation and wiring routing.
Look for signs of oxidation.
Tactile inspection:
While manipulating the wiring, use the diagnostic tool to note any change in fault status from stored to present.
Check that the connectors are correctly tightened, 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 their crimping (no crimping on
the insulating section).
Make sure that the clips and tabs are properly locked in the sockets.
Make sure no clips or tabs have been dislodged during connection.
Check the clip contact pressure using an appropriate model of tab.
Resistance check:
Check the continuity of entire lines, then section by section.
Look for a short circuit to earth, to + 12 V or with another wire.
If a fault is detected, repair or replace the wiring harness.
