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Home >> Suzuki >> 2006 >> Verona Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTC P0030 Through P0175 >> DTC P0037: HO2S Heater Control Circuit Bank 1 Sensor 2 >> DTC Troubleshooting

DTC Troubleshooting

DTC TROUBLESHOOTING CHART

Step Action Value (s) Yes No
1 Perform an ON-BOARD DIAGNOSTIC (OBD II) SYSTEM CHECK .
Is the system check complete?		 - Go to Step 2. Go to ON-BOARD DIAGNOSTIC (OBD II) SYSTEM CHECK .
2
  1. Turn the ignition OFF.
  2. Disconnect the HO2S electrical connector.
  3. Turn the ignition ON, leaving the engine OFF.
  4. Probe the harness side of the ignition feed circuit of the HO2S heater at the connector using a test lamp connected to ground.

Does the test lamp illuminate?		 - Go to Step 3. Go to Step 7.
3
  1. Measure the resistance of the heater element of the HO2S.
  2. Connect a DVM between terminal 2 and terminal 4, on the sensor side, of the HO2S connector.

Is the HO2S heater resistance within the specified range?		 4.5 - 5.7 Ω Go to Step 4. Go to Step 9.
4
  1. Connect a test lamp from B+ to the ECM side of the HO2S heater control circuit.
  2. Start the engine.

Did the test lamp illuminate only when the engine was running?		 - Go to Diagnostic Aids . Go to Step 5.
5
  1. Turn the ignition OFF.
  2. Connect the HO2S electrical connector.
  3. Disconnect the ECM electrical connector.
  4. Turn the ignition ON, leaving the engine OFF.
  5. Measure the voltage from the harness side of the HO2S heater control circuit at the ECM.

Is the voltage more than the specified value?		 10 V Go to Step 8. Go to Step 6.
6 Repair the open circuit or the short to ground in the HO2S heater control circuit.
Did you complete the repair?		 - Go to Step 11. -
7 Repair the open in the ignition positive voltage circuit.
Did you complete the repair?		 - Go to Step 11. -
8
  1. Check for a faulty connection at the ECM and HO2S electrical connectors.
  2. Repair as necessary.

Was a repair necessary?		 - Go to Step 11. Go to Step 10.
9 Replace the HO2S.
Did you complete the replacement?		 - Go to Step 11. -
10 Replace the ECM.
Did you complete the replacement?		 - Go to Step 11. -
11
  1. Start the engine.
  2. Operate the vehicle within the conditions for setting the DTC as specified in the supporting text.

Does the DTC run and pass?		 - Go to Step 12. Go to Step 2.
12 With a scan tool, observe the stored information.
Does the scan tool display any DTCs that you have not diagnosed?		 - Go to applicable DTC Table . System OK
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