Suzuki Engine 2002 GRAND VITARA SQ625, Service Manual

Page: 118 / 834

ENGINE GENERAL INFORMATION AND DIAGNOSIS (G16/J20 ENGINES) 6-113
DTC P1408 Manifold Absolute Pressure Sensor Circuit Malfunction
WIRING DIAGRAM
DTC DETECTING CONDITION AND TROUBLE AREA
DTC CONFIRMATION PROCEDURE
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.
[A] : Canvas top model 1. Manifold absolute pressure sensor
[B] : Other than canvas top model 2. ECM (PCM)
DTC DETECTING CONDITION TROUBLE AREA
• While engine is running after being warmed up and with
throttle opening smaller than specification, higher than 4.6
V manifold absolute pressure sensor output 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)
• Manifold absolute pressure sensor
• Manifold absolute pressure sensor vacuum
passage
• ECM (PCM)
WARNING:
• When performing a road test, select a place where there is no traffic or possibility of a traffic acci-
dent 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 the following conditions are satisfied when using this “DTC Confirmation
Procedure”.
• Intake air temp. : 5°C, 41°F or higher
• Engine coolant temp. : –8 – 110°C (18 – 230°F)
• Altitude (barometric pressure) : 2400 m, 8000 ft or less (560 mmHg, 75 kPa or more)