PIAGGIO PORTER 1.3 16V 2008, Service Manual

Page: 507 / 892

lution. If there is no continuity, replace
the speed sensor (instrument panel).
4. Check for interrupted and short-circuited
wires in the cable harness, and in the connec-
tor between the engine control unit and the
vehicle speed sensor
Repair or replace the cable harness or the con-
nector, otherwise check the malfunction that is
detected intermittently or due to false contact.
P1105 - Malfunzionamento circuito sensore pressione barometrica
The electronic control unit is equipped with an atmospheric sensor of the same type of the MAP sensor.
Therefore, the atmospheric sensor wiring diagram is shown in the manual.
Failure code Diagnostic failure code detection
Conditions
Affected area
P1105 When the following conditions ( 1 and 2 ) are
fulfilled for certain period:
1 . The AD conversion value of the atmospheric
sensor is lower than 1.6V
2 . The AD conversion value of the atmospheric
sensor is equal or higher than 4.7V
- Engine electronic control unit
Checking procedure
Read the frozen image data using the diagnostic tester DS-21 or OBD II general scanning device. As
frozen image data record the engine conditions at the moment the defect is detected, these data are
useful to determine during the troubleshooting phase, if at the moment of failure checking, the vehicle
was working or at standstill, if the engine was hot or not, if the air/fuel ratio was lean or rich etc.
1. Diagnostic failure code reconfirmation
•
With the ignition switch set to OFF, connect the diagnostic tester DS-21 to the Data Link
Connector through the special tool.
Specific tooling
020618Y Cable harness for connecting the OBD Connector and the Diagnostic Tester
PORTER 1.3 16V
Iniection System
IS - 507