Suzuki 2000 Grand Vitara SQ625 Service Manual page 68

6-64 ENGINE DIAGNOSIS (G16 / J20 ENGINES)
DTC P0141 HO2S-2 HEATER CIRCUIT MALFUNCTION
WIRING DIAGRAM
Refer to DTC P0136 section.
DTC DETECTING CONDITION AND TROUBLE AREA
DTC DETECTING CONDITION
Following condition is detected when HO2S-2
heater operates.
D Current of HO2S-2 heater is more than 5.3 A or
less than 0.15 A, or
D Voltage of HO2S-2 heater is more than 13.8 V or
less than 8.7 V.
(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)
1) Connect scan tool with ignition switch OFF.
2) Turn ON ignition switch and clear DTC, pending DTC and freeze frame data in ECM memory by using scan tool
and start engine.
3) Increase vehicle speed to 50 – 60 km/h (30 – 40 mph).
4) Keep driving above vehicle speed for 5 min. (Change of vehicle speed is permitted in this step).
5) Stop vehicle and check if DTC and pending DTC exists by using scan tool. If not, check if oxygen sensor heater
monitoring test has completed by using scan tool. If not in both of above checks (i.e., no pending DTC and oxy-
gen sensor heater monitoring test not completed), check vehicle conditions (environmental) and repeat Steps
3) through 5).
TROUBLE AREA
D HO2S-2 heater or its circuit
D ECM (PCM)