Suzuki WagonR+ RB310 Service Manual page 2418

DTC P0135 HEATED OXYGEN SENSOR (HO2S) HEATER CIRCUIT
(DTC No.14) MALFUNCTION (SENSOR-1)
CIRCUIT DESCRIPTION
Fuse box
Ignition
switch
Main
fuse
DTC DETECTING CONDITION
DTC will set when A or B condition is met.
A:
D Low voltage at terminal E21-7 when engine is
running at high load.
B:
D High voltage at terminal E21-7 when engine is
running under condition other than above.
: 2 driving cycle detection logic, Continuous
monitoring.
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.
1) Turn ignition switch OFF.
2) Clear DTC with ignition switch ON, start engine and keep it at idle for 1 min.
3) Start vehicle and depress accelerator pedal fully for 5 sec. or longer.
4) Stop vehicle.
5) Check DTC in "DTC" mode and pending DTC in "ON BOARD TEST" or "PENDING DTC" mode.
To HO2S-2 heater
To other sensor
Heater
E21-7
E21-13 E21-10
POSSIBLE CAUSE
D HO2S-1 heater circuit open or shorted to ground
D ECM malfunction
ENGINE DIAGNOSIS 6-59