PIAGGIO PORTER 1.3 16V 2008, Service Manual

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6 . Fuel pump relay
7 . Battery
8 . Fuel pump
9 . Ignition spark plug unit wire on the cable harness side (Electronic Control Unit side)
10 . EFI ECU control unit
11 . Ignition spark plug unit wire on the cable harness side (ignition coil side)
12 . Ignition switch wire on the cable harness side
13 . Ignition coil wire on the cable harness side
14 . Ignition device
15 . Ignition coil
16 . Spark plug
17 . 20A engine fuse
Circuit description
The system detects any irregular ignitions of the engine through an ionic current which has the same
wave shapes of combustion pressure. Each time an irregular ignition is detected, no ionic current is
generated. Therefore, if input voltage on the Electronic Control Unit side is lower than a certain value,
it is assumed that an irregular ignition is detected. Considering that the ionic current detected is too
weak, it is amplified in the ignition unit.
Failure code Diagnostic failure code detection
Conditions
Affected area
P1300 During engine start-up or operation, no signal
of ionic current is sent to the engine electronic
control unit.
- Interrupted or short-circuited wires inside the
ionic system circuit
- Ignition unit
- Ignition coil (all cylinders)
- Spark plug (all cylinders)
- Engine Electronic Control unit
Checking procedure
•
Read the frozen image data using the
diagnostic tester DS-21 or OBD II gen-
eral scanning device. As frozen image
data record the engine conditions at
the moment the defect is detected,
these data are useful to determine dur-
ing the troubleshooting phase, if at the
moment of failure checking, the vehicle
was working or at standstill, if the en-
PORTER 1.3 16V
Iniection System
IS - 509