Suzuki SY413 Service Manual page 2659

6-1-60 ENGINE GENERAL INFORMATION AND DIAGNOSIS (G13/G16 ENGINE WITH WU TWC)
DTC P0135 HEATED OXYGEN SENSOR (HO2S) HEATER CIRCUIT
MALFUNCTION (SENSOR-1)
CIRCUIT DESCRIPTION
Ignition
switch
Main
fuse
DTC DETECTING CONDITION
DTC will set when A or B condition is met.
A:
D Low voltage at terminal C21-7 when engine is running at
high load.
B:
D High voltage at terminal C21-7 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 acci-
dent 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.
NOTE:
D When DTC P0105, P0110, P0115, P0120 and P0135 are indicated together, it is possible that "Or" or "G/R"
circuit is open.
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
POSSIBLE CAUSE
D HO2S-1 heater circuit open or shorted to ground
D ECM (PCM) malfunction
ECM
(PCM)