PIAGGIO PORTER 1.3 16V 2008, Service Manual

Page: 459 / 892

Failure code Diagnostic failure code detection
Conditions
Affected area
P0116 When the engine is started, the coolant tem-
perature is -7.5°C or higher, and lower than 40°
C. After about 5 minutes the engine is running,
the coolant temperature sensor value is about
40°C or lower, (measurement logic with two in-
terventions)
- Engine coolant temperature sensor
- Cooling system
•
If the diagnostic failure codes P0115 (engine coolant temperature circuit malfunction) and
P0116 (Functional problems/engine coolant temperature circuit capacity) are generated at
the same time, the engine coolant temperature sensor circuit could be open.
•
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 de-
tected, 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.
•
To perform troubleshooting in the water temperature sensor system, using only the diag-
nostic tester DS-21 or OBD II general scanning device allows to determine if failure causes
are interrupted, short-circuited wires P0115 or functional problems P0116.
1.
If other codes are generated apart from the diagnostic failure code P0116 go to the diagnostic failure
code operation diagram applicable, otherwise proceed with step 2 .
2.
Check efficiency and replace the thermostat, if necessary, if it is efficient, replace the engine coolant
temperature sensor ECT .
PORTER 1.3 16V
Iniection System
IS - 459