Toyota Vitz SCP10 E/G Check Lamp Lit

2000 Toyota Vitz Yaris SCP10 Engine Model 1SZ

Situation
Check engine lamp illuminated.
The car run smoothly.

Cause
the nozzle of injectors clogged.

Maintenance
Diagnosis noticed P0171 that meant defect of lean vapor.
So I checked air-flow meter, spark plugs and O2 sensor.
But they were properly.
Then I took off fuel injectors and checked them.
All a third of fuel injection nozzles were clloged by carbon sludge.
After that I cleaned them and it work properly.

Toyota Vitz Yaris SCP10 E/H Hesitate

2000 Toyota Vitz Yaris SCP10 Engine Model 1SZ-FE

Situation
The engine speed did not get high smoothly when it was accelrated a littele.
The Engine idled properly.

Cause
Dirty Air flow meter

Maintenance
Diagnosis was properly.
Big sludge attatched the platinum hot wire of the air flow meter.
Then I cleaned it with partcleaner.
After that the engine speed get high smoothly.