Suzuki Baleno Manual page 1397

DTC P0121 THROTTLE POSITION CIRCUIT PERFORMANCE PROBLEM
WIRING DIAGRAM
Refer to DTC P0120.
DTC DETECTING CONDITION AND TROUBLE AREA
DTC DETECTING CONDITION
Throttle opening is detected as small (rationality-low) while engine is run-
ning under high road and high speed conditions or as large (rationality-
high) while engine is running under low load and low speed conditions (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 acci-
dent 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 temperature: higher than –75C (17.45F)
D Atmospheric pressure: higher than 560 mmHg (Altitude: lower than 2400m (8000 ft))
1) With ignition switch OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC by using scan tool if any.
3) Start engine and warm up to normal operating temperature.
4) Increase vehicle till engine speed is reached 3300 – 3700 r/min. for 10 sec.
5) Stop vehicle and run engine at idle speed for 10 sec.
6) Check DTC and pending DTC by using scan tool.
ENGINE GENERAL INFORMATION AND DIAGNOSIS (J18 ENGINE WITH WU TWC) 6-2-49
TROUBLE AREA
D Air intake system
D TP sensor
D TP sensor circuit
D ECM