Suzuki 2006 SX4, Service Manual

Page: 103 / 1478

Engine General Information and Diagnosis: 1A-59
DTC Troubleshooting
DTC P0031 / P0032: HO2S Heater Control Circuit Low / High (Sensor-1, Bank-1)
S6RW0C1104015
Wiring Diagram
Refer to “DTC P0030: HO2S Heater Control Circuit (Sensor-1, Bank-1)”.
A/F Sensor Description
Refer to “A/F Sensor Description”
DTC Detecting Condition and Trouble Area
DTC Confirmation Procedure
1) With ignition switch turned OFF, connect scan tool to DLC.
2) Turn ON ignition switch and clear DTC.
3) Start engine and warm up to normal operating temperature.
4) Run engine at idle speed for 1 min. or more.
5) Check DTC and pending DTC.
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 DTC check
Is there any DTC(s) other than P0030?
Go to applicable DTC
diag. flow. Go to Step 3.
3 Wire harness check
1) Disconnect connectors from A/F sensor and ECM with
ignition switch turned OFF.
2) Check for proper connection to A/F sensor terminals and
ECM terminals.
3) If connections are OK, check that A/F sensor circuit is as
follows.
• Insulation resistance of wire harness is infinity
between “Signal (+) circuit of A/F sensor” terminal and
each other terminal at A/F sensor connector.
• Wiring harness resistance of “Signal (+) circuit of A/F
sensor”, “Signal (–) circuit of A/F sensor”, “Control
circuit of A/F sensor heater” and “Control ground
circuit of A/F sensor heater” is less than 1
Ω
.
Are they in good condition?
Replace A/F sensor and
recheck. If this DTC is
detected again,
substitute a known-
good ECM. Repair or replace
defective wiring harness
/ connector.
DTC detecting condition Trouble area
P0031:
Heater control circuit voltage of A/F sensor is lower than
specification for more than specified time even though control
duty ratio of A/F sensor heater is less than 90% with engine
running. (Heater control duty pulse is not detected in its circuit
of ECM)
(2 driving cycle detection logic)
P0032:
Heater control circuit voltage of A/F sensor is higher than
specification for more than specified time even though control
duty ratio of A/F sensor heater is more than 10% with engine
running. (Heater control duty pulse is not detected in its circuit
of ECM)
(2 driving cycle detection logic)
• A/F sensor heater and/or its circuit
• ECM