Dtc P0153 Ho2S (Bank-2 Sensor-1) Circuit Slow Response - Suzuki 2000 Grand Vitara SQ625 Service Manual

DTC P0153 HO2S (BANK-2 SENSOR-1) CIRCUIT SLOW RESPONSE

WIRING DIAGRAM
Refer to DTC P0150 (DTC No.26).
DTC DETECTING CONDITION AND TROUBLE AREA
DTC DETECTING CONDITION
Hi/Low switch cycle average of HO2S voltage is longer than
5 sec.
DTC CONFIRMATION PROCEDURE
NOTE:
Check to make sure that following conditions are satisfied when using this DTC CONFIRMATION PROCE-
DURE.
WARNING:
D When performing a road test, select a place where there is no traffic or possibility of a traffic accident
and very careful during to avoid occurrence of an accident.
D Road test, should be carried out with 2 person, a driver and tester, on a level road.
D Intake air temperature: between –14_C and 70_C (6.8_F and 158_F)
D Atmospheric pressure: higher than 560 mmHg (Altitude: lower than 2790 m (9150 ft))
D Following DTC is not detected: P0135
(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 speed to 80 – 100 km/h (50 – 60 mph). (engine speed; 2500 – 3000 r/min.)
(5) Keep above vehicle speed for 1 min. (Throttle valve operating is kept constant in this step.)
(6) Stop vehicle and check DTC and pending DTC by using scan tool.
DTC TROUBLESHOOTING
STEP
1 Was "ENGINE DIAG. FLOW TABLE" performed?
2 Wire Harness check:
(1) Check "R/Bl" and "Gr/Y" wire.
Are they in good condition?
3 (1) Replace HO2S (B-2 S-1) and recheck.
Is DTC P0153 detected?
ACTION
ENGINE (H25 ENGINE) 6-1-75
TROUBLE AREA
HO2S
HO2S circuit
ECM (PCM)
YES
Go to Step 2.
Go to Step 3.
Substitute a known-
good ECM (PCM)
and recheck.
NO
Go to "ENGINE
DIAG. FLOW
TABLE".
Repair or replace.
Faulty HO2S
(B-2 S-1).