P0171

Wiring Diagram:

CIRCUIT DESCRIPTION
Refer to Air/Fuel ratio feed back compensation (Closed Loop System).

Detecting Condition / Possible Cause:

DTC CONFIRMATION PROCEDURE

WARNING:
- When performing a road test, select a place where there is no traffic or possibility of a traffic accident and be very careful during testing to avoid occurrence of an accident.
- Road test should be carried out with 2 persons, a driver and a tester on a level road.

1. Turn ignition switch OFF.
2. Clear DTC with ignition switch ON.

3. Check vehicle and environmental condition for:
- Indication of fuel level meter in combination meter: 1/4 or more (For 1999 MY)
- Altitude (barometric pressure): 2400 m, 8000 ft or less (560 mmHg, 75 kPa or more)
- Ambient temp.: -10 °C, 14 °F or higher
- Intake airtemp.: 70 °C, 158 °F or lower

4. Start engine and drive vehicle under usual driving condition for 5 min. or longer and until engine is warmed up to normal operating temperature.
5. Keep vehicle speed at 30 - 40 mph, 50 - 60 kph in 5th gear or "D" range for 5 min. or more.
6. Stop vehicle (do not turn ignition switch OFF).
7. Check pending DTC in "ON BOARD TEST' or "PENDING DTC" mode and DTC in "DTC" mode.

Inspection (Steps 1 - 7):

Inspection (Steps 8 - 11):

Figure 1, 2, 3, 4, 5, 6 For Steps 3, 4, 5 And 6: