Dtc P0031 / P0032: Ho2S Heater Control Circuit Low / High (Sensor-1) - Suzuki Grand Vitara 2011 Manual

DTC P0031 / P0032: HO2S Heater Control Circuit Low / High (Sensor-1)

Wiring Diagram
Refer to "DTC P0030: HO2S Heater Control Circuit (Sensor-1): For Petrol Engine Model".
A/F Sensor Description
Refer to "A/F Sensor Description: For Petrol Engine Model".
DTC Detecting Condition and Trouble Area
DTC detecting condition
P0031:
Heater control circuit voltage of A/F sensor is lower than
specification for more than specified time continuously 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 continuously 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)
DTC Confirmation Procedure
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) Run engine at idle speed for 1 min. or more.
5) Check DTC and pending DTC.
DTC Troubleshooting
NOTE
Before this trouble shooting is performed, read the precautions for DTC troubleshooting referring to
"Precautions for DTC Troubleshooting: For Petrol Engine Model".
Step
1 Was "Engine and Emission Control System Check"
performed?
2 A/F sensor heater circuit check
1) Disconnect connector from A/F sensor with ignition
switch turned OFF.
2) Check for proper connection to A/F sensor connector.
3) If connection are OK, measure voltage between heater
power terminal of A/F sensor connector and vehicle
body ground with ignition switch turned ON.
Is measured voltage 10 – 14 V?
Engine General Information and Diagnosis: For Petrol Engine Model 1A-72
Action
Trouble area
• A/F sensor heater circuit
• A/F sensor heater
• ECM
Yes
Go to Step 2.
Go to Step 9.
S6JB0A1114016
No
Go to "Engine and
Emission Control
System Check: For
Petrol Engine Model".
Go to Step 3.