YH4
GRAND
VITARA
6-1-80 ENGINE (H25 ENGINE)
25 24
TERMINAL ARRANGEMENT OF ECM (PCM) COUPLER (VIEWED FROM HARNESS SIDE)
1. HO2S heater relay
2. HO2S
DTC P0156 HO2S (BANK-2 SENSOR-2) CIRCUIT MALFUNCTION
WIRING DIAGRAM
DTC DETECTING CONDITION AND TROUBLE AREA
DTC DETECTION CONDITION TROUBLE AREA
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.
HO2S
HO2S circuit
Fuel injector
Fuel pressure control system
ECM (PCM)
DTC CONFIRMATION PROCEDURE
NOTE:
Check to make sure that following conditions are satisfied when using this DTC CONFIRMATION PROCE-
DURE.
WARNING:
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.
Road test, should be carried out with 2 person, a driver and tester, on a level road.
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