System Inspection

Engine Control

P0172 System too Rich (Bank 1) - System Inspection

System Inspection

Check blocking of intake system
1. Visually/physically inspect the blocking in intake system for following items.
> Throttle body gasket and damage
> Blocking in intake manifold and injector caused by any foreign substance
2. Has a problem been found?





Fuel Pressure Inspection

NOTE:
1. Be cautious as fuel is explosive and an empty fuel tank can still contain explosive gases. When working on fuel systems make sure to supply adequate ventilation to the work area. Do not smoke and keep sparks and open flames away.
2. The fuel system remains under pressure when the engine is not running. Release fuel system pressure before disconnecting any fuel line to reduce the chance of personal injury or fire damage to vehicle components.

1. IG "OFF" and disconnect Fuel Pump Relay in Junction Box.
2. Start engine and wait until it stalls.
3. IG "OFF" and reconnect Fuel Pump Relay.
4. Install the fuel pressure gauge to the delivery pipe with the correct adaptor(s).
5. Activate the fuel pump and check that there is no fuel leakage from the pressure gauge or connections.
6. Measure the fuel pressure at idle.

Specification : 55.0 psi

7. Is the measured fuel pressure within specifications?










Check fuel leakage in injector
1. IG "OFF" after checking the fuel pressure test.
2. Stop engine and check for a change in the fuel pressure gauge reading for 5 minutes.

Specification : After engine stops, fuel gauge reading is maintained for 5 minutes.

3. Is the fuel gauge reading maintained?