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Home >> Suzuki >> 2007 >> SX4 Base, Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> Engine Control Systems >> Engine General Information And Diagnosis >> Diagnostic Information and Procedures >> DTC P0030: HO2S Heater Control Circuit (Sensor-1, Bank-1) >> DTC Troubleshooting
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DTC Troubleshooting

DTC TROUBLESHOOTING CHART

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.
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