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Home >> Suzuki >> 2007 >> Grand Vitara Base, RWD, Standard >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine General Information And Diagnosis >> Diagnostic Information And Procedures >> DTC P0057/P0058: HO2S Heater Control Circuit Low/High (Sensor-2, Bank-2) >> DTC Troubleshooting
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DTC Troubleshooting

NOTE: Before this trouble shooting is performed, read the precautions for DTC troubleshooting, referring to PRECAUTIONS FOR DTC TROUBLESHOOTING .
TROUBLESHOOTING TABLE

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 A/F sensor DTC check 
Are there DTC P0031 and/or P0051? 		 Go to applicable DTC flow referring to DTC P0031/P0032: HO2S HEATER CONTROL CIRCUIT LOW/HIGH (SENSOR-1, BANK-1)  and/or DTC P0051/P0052: HO2S HEATER CONTROL CIRCUIT LOW/HIGH (SENSOR-1, BANK-2) . Go to Step 3.
3 HO2S heater relay and its circuit check 
  1. Disconnect connector from HO2S (bank-2) with ignition switch turned OFF.
  2. Check for proper terminal connection to HO2S (bank-2) connector.
  3. If connections are OK, check that HO2S (bank-2) heater control circuit is as follows.
    • Circuit voltage between "Power supply circuit of HO2S (bank-2) heater" and vehicle body ground is battery voltage with ignition switch turned ON.

Is it in good condition? 		 Go to Step 4. Repair or replace defective wiring harness.
4 HO2S heater circuit check 
  1. Check that HO2S (bank-2) heater control circuit is as follows.
    • Circuit voltage between "Control circuit of HO2S (bank-2) heater" and vehicle body ground is 0 V with ignition switch turned ON.

Is it good condition? 		 Go to Step 5. Repair or replace defective wiring harness.
5 HO2S heater circuit check 
  1. Disconnect connectors form ECM and check for proper terminal connection to ECM connector.
  2. If connections are OK, check that HO2S (bank-2) heater circuit is as follows.
    • Insulation resistance of wire harness is infinity between "Control circuit of HO2S (bank-2) heater" terminal and each other terminal at HO2S (bank-2) connector.
    • Wiring harness resistance of "Control circuit of HO2S (bank-2) heater" is less than 1Ω.
    • Insulation resistance between "Control circuit HO2S (bank-2) heater" and vehicle body ground is infinity.

Is it in good condition? 		 Go to Step 6. Repair or replace defective wiring harness.
6 HO2S heater check 
  1. Check heater resistance of HO2S (bank-2), referring to HEATED OXYGEN SENSOR (HO2S-2) HEATER ON-VEHICLE INSPECTION .

Is HO2S (bank-2) heater in good condition? 		 Substitute a known good ECM and recheck. Replace HO2S (bank-2).
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