P0450

Wiring Diagram:

CIRCUIT DESCRIPTION
Refer to EVAPORATIVE EMISSION CONTROL SYSTEM PRESSURE SENSOR signal.

Detecting Condition / Possible Cause:

NOTE: When other DTC(s) is indicated together, it is possible that "P/G" or "BI" circuit is open.

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 that indication of fuel level meter in combination meter is within 1/4 - 3/4.
4. Drive vehicle at 10 - 30 mph (15 - 50 kph ) including short stop for 5min.
5. Check pending DTC in "ON BOARD TEST" or "PENDING DTC" mode and DTC in "DTC" mode.

Inspection (Steps 1 - 5):

Fuel Tank Pressure Sensor Check




1. Remove fuel tank pressure sensor from fuel tank.
2. Check sensor air vent hole and pressure passage for clog. Clean if clogged.
3. Arrange 3 new 1.5 V batteries in series (check that total voltage is 4.5 -5.0 V) and connect its positive terminal to "Vin" terminal of sensor and negative terminal to "Ground" terminal. Then check voltage between ""out' and "Ground".
Also, check if voltage reduces when vacuum is applied up to 6.6 kPa (50 mm Hg) by using vacuum pump and if it increases when positive pressure applied up to 6.6 kPa (50 mmHg) by using hand pump.
It measured voltage doesn't show such characteristic as shown in figure, replace.

Tank Pressure Control Valve Inspection (99 MY)




1. Remove tank pressure control valve.
2. Air should pass through valve smoothly from fuel tank side (TANK mark side of tank pressure control valve) to EVAP canister side when blown hard.
3. From CAN mark side, even when blown softly, air should come out of TANK mark side.
4. If air doesn't pass through valve in step 2) or hard blow is required in step 3), replace tank pressure control valve.

WARNING: DO NOT SUCK air through tank pressure control valve. Fuel vapor inside the valve is harmful.

5. Apply vacuum to vacuum port.
In this state, blow TANK mark port. Air should come out of CAN mark port.
If check result is not as described, replace tank pressure control valve.

WARNING: DO NOT SUCK air through tank pressure control valve. Fuel vapor inside the valve is harmful.

6. Install tank pressure control valve.