Suzuki 2000 Grand Vitara SQ625 Service Manual page 57

DTC P0121 THROTTLE POSITION RANGE/PERFORMANCE PROBREM
WIRING DIAGRAM
Refer to previous page (DTC P0120).
DTC DETECTING CONDITION AND TROUBLE AREA
DTC DETECTING CONDITION
Throttle opening change is smaller than specification
while intake air volume changes and engine is
running at constant speed.
(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.: –8_C, 18_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)
ENGINE DIAGNOSIS (G16 / J20 ENGINES) 6-53
TROUBLE AREA
D TP sensor
D ECM (PCM)
D High resistance in circuit