P1408
WIRING DIAGRAM
DTC DETECTING CONDITION AND TROUBLE AREA
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.
NOTE: Check to make sure that following condition is satisfied when using this DTC CONFIRMATION PROCEDURE.
- Intake air temp.: -10 °C, 14 °F or higher
- Altitude (barometric pressure): 2400 m, 8000 ft or less (560 mmHg, 75 kPa or more)
1. Connect scan tool to DLC with ignition switch OFF
2. Turn ON ignition switch and clear DTC using scan tool and warm up engine completely.
3. Drive vehicle at 30 MPH, 50 KPH or more for 10 min. or more.
4. Release accelerator pedal and with engine brake applied, keep vehicle coasting arid stop vehicle.
5. Run engine at idle speed for 1 min.
6. Check DTC and pending DTC.
TROUBLESHOOTING
Manifold Differential Pressure Sensor Check
1. Disconnect manifold differential pressure sensor coupler.
2. Remove manifold differential pressure sensor.
3. Check pressure passage and air vent hole for clog. Clean if clogged.
CAUTION: Do not put drills or wires into passage and hole for cleaning. It causes damage in it.
4. Arrange 3 new 1.5 V batteries in series and connect its positive terminal to "Vin" terminal of coupler and negative terminal to "Ground" terminal. Then check voltage between "Vout" and "Ground".
Also, check if voltage reduces when vacuum is slowly applied up to 400 mmHg by using vacuum pump.
CAUTION: As connection to wrong terminal will cause damage to manifold differential pressure sensor, make absolutely sure to connect properly as shown in left image.
Output voltage at "Vout" (When voltage at "Vin" is 4.5 V)
If check result is not satisfactory, replace manifold differential pressure sensor.
5. Install manifold differential pressure sensor. Connect manifold differential pressure sensor coupler securely.