Suzuki 2000 Grand Vitara SQ625 Service Manual page 98

6-94 ENGINE DIAGNOSIS (G16 / J20 ENGINES)
DTC P1408 MANIFOLD ABSOLUTE PRESSURE SENSOR CIRCUIT MALFUNCTION
WIRING DIAGRAM
1. Manifold absolute
pressure sensor
DTC DETECTING CONDITION AND TROUBLE AREA
DTC DETECTING CONDITION
D While engine is running after being warmed up and
with throttle opening smaller than specification, high-
er than 4.6 V manifold absolute pressure sensor out-
put voltage is detected for specified time or with
throttle opening larger than specification, lower than
0.2 V manifold absolute pressure output voltage is
detected for specified time.
(2 driving cycles detection logic)
DTC CONFIRMATION PROCEDURE
WARNING:
D 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.
D Road test should be carried out with 2 persons, a driver and a tester, on a level road.
NOTE:
Check to make sure that the following conditions are satisfied when using this DTC CONFIRMATION PRO-
CEDURE.
D Intake air temp.: 5_C, 41_F or higher
D Engine coolant temp.: –8 – 110_C (18 – 230_F)
D 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, pending DTC and freeze frame data by using scan tool and warm up
engine completely.
3) Run engine at idle speed for 1 min.
4) Increase vehicle speed to 80 km/h (50 mph).
5) Keep driving above vehicle speed for 1 min. (Change of vehicle speed is permitted in this step).
6) Stop vehicle and check DTC and pending DTC by using scan tool.
TROUBLE AREA
D Manifold absolute pressure sensor
D Manifold absolute pressure sensor vacuum
passage
D ECM (PCM)