PIAGGIO PORTER 1.3 16V 2008, Service Manual

Page: 492 / 892

P0135 - Malfunzionamento circuito sensore posizione albero a camme
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. Checking the cam angle sensor circuit re-
sistance
•
Set the special tool (sub-wiring har-
ness). Connector A of the tool must
remain disconnected from the Elec-
tronic Control Unit connector B.
2 . Set the ignition switch to OFF and measure resistance between terminals of the special tool 22 -
52 ( N2 + N2 ).
Characteristic
specified value
from 205 to 255 Ohm at 20°C
Signal control
Check with an oscilloscope.
a. Connect connector A to the electronic control
unit.
b. Start the engine and run it at idle speed.
c. Connect the positive (+) and negative (-) probe
of an oscilloscope to the special tool connector
terminals from 22 to 23 , respectively.
Iniection System
PORTER 1.3 16V
IS - 492