PIAGGIO PORTER 1.3 16V 2008, Service Manual

Page: 497 / 892

- STRICTLY OBSERVE THE TESTING CONDITIONS TO DETECT THE MALFUNCTION.
- IF THERE IS NO DIAGNOSTIC TESTER DS-21 AVAILABLE, SET THE IGNITION SWITCH TO OFF
AFTER CARRYING OUT STEPS FROM 2 TO 4, THEN REPEAT THESE STEPS.
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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. Other codes besides P0420 are indicated; consult the relevant diagram of diagnostic failure.
2. Front oxygen sensor checking
(bench 1, sensor 1).
(See troubleshooting of diagnostic failure code P0130). Repair or replace, if necessary.
3. Rear oxygen sensor checking
(bench 1, sensor 2).
(See troubleshooting of diagnostic failure code P0136 ). Repair or replace, if necessary.
4. Validate the driving configuration.
5. If the failure code P0420 has not been indicated again, check the failure that is detected with inter-
mittence or due to a bad contact, otherwise replace the three-way catalytic converter.
PORTER 1.3 16V
Iniection System
IS - 497