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Home >> Suzuki >> 2005 >> Swift + >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 1.6L (L91) - Troubleshooting & Diagnosis >> Troubleshooting >> Inspection/Maintenance (I/M) Heated Oxygen Sensor (HO2S) Heater System Set Procedure >> Test Description
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Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. 1:  Make sure you perform the I/M System Check before performing this test. Failure to do so may result in difficulty updating the status to YES.
  2. 2:  Preprogramming the scan tool will reduce the amount of time the oxygen sensor heaters operate while verifying the enable criteria. The HO2S Heater Tests may not complete when initiated from a cold start and may require running under a load in order to complete the tests.
  3. 3:  This step is to identify a first failure of a type B DTC. A DTC only appears on the I/M System Status display when it becomes a MIL illuminating DTC. This occurs on the second failure of a type B DTC. A first failure of a type B DTC will not allow the I/M System Status to update to YES. Refer to Diagnostic Aids.
  4. 4:  This step is to help identify any unique or unusual criteria required to run the diagnostic test in the event the universal set procedure does not. This information is located in the service information under Conditions for Running the DTC.
  5. 5:  The I/M System Status only reports on whether or not a diagnostic has run, not what the outcome of the test was. If any emission related DTC sets after the tests are complete, the DTC will require diagnosis.
Inspection/Maintenance (I/M) Heated Oxygen Sensor (HO2S) Heater System Set Procedure

Step Action Values Yes No
1  Did you perform the Inspection/Maintenance (I/M) System Check? - Go to Step 2  Go to Inspection/Maintenance (I/M) System Check 
2 
    IMPORTANT: If the ignition is turned ON, ignition positive voltage is supplied to the heated oxygen sensor (HO2S) heaters. After verifying the enable criteria, turn OFF the ignition for approximately 5 minutes to allow the sensors to cool before continuing with the test.
  1. Preprogram the scan tool with the vehicle information before the ignition is turned ON.
  2. Verify that the vehicle is within the Conditions for Running for the DTC.
  3. Set the vehicle parking brake.
  4. Verify the transmission is in Park or Neutral.
  5. Turn OFF all of the accessories. For example, the A/C system and the blower fan.
  6. Start the engine.
  7. Allow the engine to idle for the specified time.
  8. With a scan tool, observe the I/M System Status display.
Did the HO2S Heater System Status update to YES?		 5 minutes Go to Step 5  Go to Step 3 
3  With a scan tool, observe the DTC information.
Does the scan tool indicate any failed DTCs?		 - Go to Diagnostic Trouble Code (DTC) List Go to Step 4 
4 
  1. Refer to the Inspection/Maintenance (I/M) System DTC Table  to determine which DTCs are required to run in order to complete this test.
  2. With a scan tool, observe the Not Ran Since Code Cleared display.
  3. Determine which of the DTCs required for a YES status has not run.
  4. Enter the DTC number in the Specific DTC menu of the scan tool.
  5. Operate the vehicle within the Conditions for Running the DTC, located in the supporting text for the diagnostic table of the DTC.
  6. Repeat the procedure until the scan tool indicates the diagnostic test has run.
  7. Repeat steps 4-6 for any additional required DTCs that have not run.
  8. With a scan tool, observe the I/M System Status display.
Did the HO2S Heater System Status update to YES?		 - Go to Step 5  Go to Diagnostic Aids
5  With a scan tool, observe the Emission Related DTC portion of the I/M System Status display.
Does the scan tool indicate any Emission Related DTCs set?		 - Go to Diagnostic Trouble Code (DTC) List System OK
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