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Home >> Suzuki >> 2011 >> Grand Vitara Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis >> Diagnostic Information and Procedures >> DTC P0031: HO2S Heater Control Circuit Low (Bank-1 Sensor-1); DTC P0032: HO2S Heater Control Circuit High (Bank-1 Sensor-1) >> DTC Troubleshooting
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DTC Troubleshooting

P0031, P0032 DIAGNOSIS PROCEDURE

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:J24B .
2  A/F sensor heater power supply circuit check 
  1. Turn OFF ignition switch and disconnect connector from A/F sensor.
  2. Check for proper terminal connection to A/F sensor.
  3. If connections are OK, turn ignition switch to ON position.
  4. Check that A/F sensor heater power supply circuit (A1) is battery voltage.

Is it in good condition? 		 Go to Step 3. Repair or replace defective parts or wire harness.
3  A/F sensor heater drive circuit check 
  1. Turn OFF ignition switch and disconnect connectors from ECM.
  2. Check for proper terminal connection to ECM connectors.
  3. If connections are OK, check that A/F sensor heater drive circuit (A2) is as follows.
    • Wiring harness resistance of A/F sensor heater drive circuit is less than 3 Ω.
    • Insulation resistance between A/F sensor heater drive circuit and vehicle body ground is infinity.
    • Insulation resistance of wire harness is infinity between A/F sensor heater drive circuit terminal and each terminal at A/F sensor connector.
    • Circuit voltage of A/F sensor heater drive circuit is 0 - 1 V with ignition switch in ON position.

Is it in good condition? 		 Go to Step 4. Repair or replace defective wire harness.
4  A/F sensor check 
  1. Check A/F sensor heater. See A/F (AIR FUEL RATIO) SENSOR ON-VEHICLE INSPECTION

Is it in good condition? 		 Substitute a known-good ECM and recheck. Replace A/F sensor, see A/F (AIR FUEL RATIO) SENSOR, HO2S (HEATED OXYGEN SENSOR) REMOVAL AND INSTALLATION .
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