Suzuki 2000 Grand Vitara SQ625 Service Manual page 66

6-62 ENGINE DIAGNOSIS (G16 / J20 ENGINES)
DTC P0136 HO2S-2 CIRCUIT MALFUNCTION
WIRING DIAGRAM
1. To ignition switch
DTC DETECTING CONDITION AND TROUBLE AREA
DTC DETECTING CONDITION
DTC will set when any one of following conditions
is detected.
D 4.5 V or more HO2S circuit voltage is detected when
5 V power is connected to HO2S circuit in ECM
(PCM).
D While running with A/F feed back, average output
voltage during specified time is too high or too low.
or
D while running with A/F feed back, max output voltage
during specified time is lower than specified value or
min. output voltage during specified time is higher
than specified value.
(2 driving cycles detection logic)
TROUBLE AREA
D HO2S-2 or its circuit
D Fuel system
D ECM (PCM)