PIAGGIO PORTER 1.3 16V 2008, Service Manual

Page: 528 / 892

4 . 15A EFI fuse No. 2
5 . Main relay
6 . Fuel pump relay
7 . Battery
8 . Fuel pump
9 . Cable harness side wire
10 . Vacuum switching valve (VSV) for ERG
11 . Injector
12 . EFI ECU control unit
Circuit description
In order to reduce NOx emissions, the anti-pollu-
tion system with exhaust gas recirculation (EGR)
allows the recirculation of an ideal quantity of ex-
haust fumes inside the inlet manifold according to
riding conditions, moderating combustion. The
suction pipe leading to the EGR valve is equipped
with a vacuum switching valve. Therefore, if EGR
working conditions are fulfilled, the electronic con-
trol unit closes the atmospheric inlet opening of the
vacuum switching valve allowing the conduction of
vacuum to the EGR valve. In this way, the recir-
culation of exhaust fumes is obtained.
KEY:
1 . Vacuum modulator
2 . ECU
3 . Switching valve
4 . EGR valve
5 . Throttle body
Failure code Diagnostic failure code detection
Conditions
Affected area
P1667 If there are interrupted or short-circuited wires
in the vacuum switching valve for EGR and
conditions necessary to carry out the recircu-
lation of exhaust fumes have been fulfilled:
(detection logic with 2 interventions)
- Interrupted or short-circuited wire in the circuit
of the vacuum switching valve for EGR
- Vacuum switching valve for EGR
- Engine electronic control unit
Checking procedure
NOTE:
Iniection System
PORTER 1.3 16V
IS - 528