PIAGGIO PORTER 1.3 16V 2008, Service Manual

Page: 521 / 892

IF THE IDLE SWITCH TURNS OFF WHILE TERMINAL T IS SET TO ON, IT IS POSSIBLE TO IN-
SPECT, IF THE IDL SYSTEM OF THE THROTTLE VALVE SENSOR WORKS PROPERLY BY
CHECKING THE DIAGNOSTIC FAILURE CODE GENERATED.
Checking procedure
If the diagnostic failure codes P0110 , (intake air temperature circuit malfunction), P0115 (engine coolant
temperature circuit malfunction), and P0120 (Throttle/pedal position sensor switch malfunction A ) are
generated at the same time, the Sensor Ground E2 could be open.
1. Check the input signal of the electronic control unit
•
Set the special tool (sub-wiring harness).
•
With the ignition switch to ON, measure the voltage between connectors 16 , 17 VC and E2,
44 , 17 VTH and E2.
Characteristic
specified value:
16 , 17 VC and E2 : 4.5 - 5.5 V .
44 , 17 VTH and E2 : move the throttle lever from the completely closed to the completely open position,
voltage must increase proportionally from 0 to 4.8 V.
If failures are detected during checks, inspect the
malfunction that is detected intermittently or due to
false contact, otherwise proceed with step 2 .
2.Checking the cable harness between the neutral starter switch and the electronic control unit.
As for switch C / A and the throttle valve sensor, go to step 2 of the section: Using the diagnostic tester
DS - 21 Repair or replace the cable harness or the connector, if necessary, otherwise check or replace
the engine electronic control unit.
PORTER 1.3 16V
Iniection System
IS - 521