PIAGGIO PORTER 1.3 16V 2008, Service Manual

Page: 405 / 892

Specific tooling
020618Y Cable harness for connecting the OBD Connector and the Diagnostic Tester
A = voltage indicator (switch section)
CONNECT THE TESTER DS-21 TO ANOTHER VEHICLE, SET THE IGNITION SWITCH TO ON:
1. When the voltage indicator of the diagnostic tester DS-21 turns on: Vehicle side operation failure.
Check the data link connector, +B and Ground. - BAT terminal voltage check - Continuity check
between terminals E and Ground.
2. When the voltage indicator of the diagnostic tester DS-21 does not turn on: Operation failure of the
diagnostic tester DS-21
Troubleshooting
The engine control system is equipped with diagnosis functions able to diagnose areas which have
operation failures. Such functions are important for troubleshooting purposes. The operation diagram
in the following page shows the procedure to be followed to identify the failures using the diagnosis
functions mentioned. The operation diagram shows how to use the diagnostic failure code control effi-
ciently. Besides, once all the results are examined, it can be determined if the troubleshooting is carried
out according to the diagnostic failure codes or according to the malfunction phenomenon. The diag-
nosis of this system is equipped with a battery protection function (which allows to power the diagnosis
memory also with the ignition switch set to OFF).
- IF THE DIAGNOSTIC TESTER DS-21 OR OBD-II GENERAL SCANNING DEVICE IS NOT USED,
THE DIAGNOSTIC FAILURE CODE OR THE FROZEN IMAGE DATA CAN NOT BE READ IN THE
OPERATION DIAGRAM.
Customer information
The cause of the vehicle failure can not be removed, if the malfunction phenomenon is not previously
confirmed. Even if operations are continued for a long indefinite time, the vehicle can not be restored
unless the malfunction phenomenon is confirmed. The information provided by the customer is impor-
tant and it must be obtained even before the malfunction phenomenon confirmation. The information
obtained from the customer is important evidence to reproduce the malfunction phenomenon. Besides,
information provided by the customer can be consulted during troubleshooting. Therefore, instead of
posing general questions, focus attention on what is related to the defect. The following five points
represent the most important questions to be posed to analyse the operation defect. In some cases,
information about defects previously detected and about the past record of repairs, which apparently
PORTER 1.3 16V
Iniection System
IS - 405