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Home >> Suzuki >> 2007 >> SX4 Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 151 (Engine General Information And Diagnosis) >> Diagnostic Information And Procedures >> DTC P2630/P2631: O2 Sensor Pumping Current Trim Circuit Low/High (Sensor-1, Bank-2) >> DTC Troubleshooting
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DTC Troubleshooting

WARNING: This page is about a different car, the 2006 Suzuki Grand Vitara. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Before this trouble shooting is performed, read the precautions for DTC troubleshooting referring to PRECAUTIONS FOR 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  A/F sensor adjusting resistor circuit check 
  1. Disconnect connectors from A/F sensor (bank-2) and ECM with ignition switch turned OFF.
  2. Check for proper terminal connection to A/F sensor (bank-2) connector and ECM connector.
  3. If connections are OK, check that A/F sensor (bank-2) adjusting resistor circuit is as follows.
    • Wiring harness resistance of each "Adjusting resistor (+) circuit of A/F sensor (bank-2)" and "Adjusting resistor (-) circuit of A/F sensor (bank-2)" is less than 1 Ω.
    • Insulation resistance between "Adjusting resistor (+) circuit of A/F sensor (bank-2)" and vehicle body ground is infinity.
    • Insulation resistance between "Adjusting resistor (+) circuit of A/F sensor (bank-2)" and "Adjusting resistor (-) circuit of A/F sensor (bank-2)" is infinity.
    • Insulation resistance of wire harness is infinity between "Signal (+) circuit of A/F sensor (bank-2)" terminal and each other terminal at A/F sensor (bank-2) connector.
    • Insulation resistance of wire harness is infinity between "Signal (-) circuit of A/F sensor (bank-2)" terminal and each other terminal at A/F sensor (bank-2) connector.
    • Circuit voltage between "Adjusting resistor (+) circuit of A/F sensor (bank-2)" and vehicle body ground is 0 V with ignition switch tuned ON.

Are they in good condition? 		 Go to Step 3. Repair or replace defective wiring harness.
3  A/F sensor adjusting resistor check 
  1. Check for resistance of A/F sensor (bank-2) adjusting resistor referring to AIR FUEL RATIO (A/F) SENSOR ON-VEHICLE INSPECTION .

Is check result satisfactory? 		 Substitute a known-good ECM and recheck. If ECM OK, replace A/F sensor (bank-2). Replace A/F sensor (bank-2).
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