Dtc P0156 Ho2S (Bank-1 Sensor-2) Circuit Malfunction - Suzuki 2000 Grand Vitara SQ625 Service Manual

6-1-80 ENGINE (H25 ENGINE)
DTC P0156 HO2S (BANK-2 SENSOR-2) CIRCUIT MALFUNCTION
WIRING DIAGRAM
TERMINAL ARRANGEMENT OF ECM (PCM) COUPLER (VIEWED FROM HARNESS SIDE)
DTC DETECTING CONDITION AND TROUBLE AREA
DTC DETECTION CONDITION
Maximum HO2S voltage is higher than 2.0 V for 20 sec.
Maximum HO2S voltage is less than 0.35 V for 8 min.
Minimum HO2S voltage is higher than 0.25 V for 4 sec.
while fuel is cut.
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.
25 24
1. HO2S heater relay
2. HO2S
TROUBLE AREA
HO2S
HO2S circuit
Fuel injector
Fuel pressure control system
ECM (PCM)