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Home >> Suzuki >> 2007 >> Reno Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 213 (Engine General Information And Diagnosis) >> Diagnostic Information and Procedures >> DTC P0140: O2 Sensor (HO2S) Circuit No Activity Detected (Sensor-2, Bank-1) >> DTC Troubleshooting
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DTC Troubleshooting

WARNING: This page is about a different car, the 2007 Suzuki SX4. However, it is still accessible from the selected car via links, so may be relevant.
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  Wire harness check 
  1. Disconnect connector from HO2S and ECM with ignition switch turned OFF.
  2. Check for proper connection of each HO2S circuit terminal to HO2S connector and to ECM connector.
  3. If connections are OK, check HO2S circuit for the following.
    • Wiring harness resistance of each "Signal circuit of HO2S" and "Ground circuit of HO2S" is less than 1 Ω.
    • Insulation resistance between "Signal circuit of HO2S" and vehicle body ground is infinity.
    • Insulation resistance of wire harness is infinity between "Signal circuit of HO2S" terminal and each other terminal at HO2S connector.
    • Circuit voltage between "Signal circuit of HO2S" and vehicle body ground is 0 V with ignition switch turned ON.

Are they in good condition? 		 Go to Step 3. Repair or replace defective wiring harness / connector.
3  HO2S heater circuit check 
  1. Check HO2S heater circuit referring to Step 2 to 4 of DTC P0037 / P0038: HO2S HEATER CONTROL CIRCUIT LOW / HIGH (SENSOR-2, BANK-1) .

Is circuit in good condition? 		 Replace HO2S and recheck. If this DTC is detected again, substitute a known-good ECM. Repair or replace defective wiring harness / connector.
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