System Inspection

P0171 System too Lean (Bank 1)

Inspection/Repair - System Inspection

System Inspection

Air leakage check
1. Check "Air intake system"
> Check looseness, deterioration or contamination on throttle body and gasket.
> Check contamination, damage or crack on intake manifold, ISCA and injectors.
2. Is there any leakage?





Fuel line check
1. Check "Fuel line system"
> Check looseness of connectors on fuel line.
> Check looseness, damage, or interference of vacuum hose on fuel line.
> Check damage, leakage or bending on fuel line pipe.
2. Is fuel line normal?





Fuel line pressure check
1. IG KEY "OFF".
2. Disconnect a fuel pump relay.
3. Engine start and wait until engine stop. and then IG KEY "OFF".
4. Connect a fuel pump relay.
5. Connect a fuel pressure gauge to a fuel filter by a fuel pressure gauge adaptor.
6. Engine start and measure a fuel pressure.

Specification : Approx. 3.5 kg/cm2




7. Is the fuel pressure normal?