Suzuki 2006 SX4, Service Manual

Page: 124 / 1478

1A-80 Engine General Information and Diagnosis:
DTC P0140: O2 Sensor (HO2S) Circuit No Activity Detected (Sensor-2, Bank-1)
S6RW0C1104032
Wiring Diagram
Refer to “DTC P0030: HO2S Heater Control Circuit (Sensor-1, Bank-1)”.
DTC Detecting Condition and Trouble Area
DTC Confirmation Procedure
NOTE
Check to make sure that the following conditions are satisfied when using this “DTC Confirmation
Procedure”.
• The following DTCs are not detected: DTCs related to HO2S heater
1) With ignition switch turned OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Start engine and warm up to normal operating temperature.
4) Check DTC and pending DTC.
DTC Troubleshooting
8 Air intake system check
1) Check air intake system for clog or leak.
Is it OK?
Replace HO2S and
recheck. If this DTC is
detected again,
substitute a known-
good ECM. Repair or replace air
intake system.
Step Action Yes No
DTC detecting condition Trouble area
Output voltage of HO2S is higher than 4.5 V for 0.5 sec.
(2 driving cycle detection logic) • HO2S and/or its circuit
• ECM
Step Action Yes No
1 Was “Engine and Emission Control System Check”
performed? Go to Step 2. Go to “Engine and
Emission Control
System Check”.
2 Wire harness check
1) Disconnect connector from HO2S and ECM with ignition
switch turned OFF.
2) Check for proper connection of each HO2S circuit
terminal to HO2S connector and to ECM connector.
3) If connections are OK, check HO2S circuit for the
following.
• Wiring harness resistance of each “Signal circuit of
HO2S” and “Ground circuit of HO2S” is less than 1
Ω
.
• Insulation resistance between “Signal circuit of HO2S”
and vehicle body ground is infinity.
• Insulation resistance of wire harness is infinity
between “Signal circuit of HO2S” terminal and each
other terminal at HO2S connector.
• Circuit voltage between “Signal circuit of HO2S” and
vehicle body ground is 0 V with ignition switch turned
ON.
Are they in good condition?
Go to Step 3. Repair or replace
defective wiring harness
/ connector.