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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. Allow the engine to r each operating temperature.
  2. Operate the vehicle within the parameters specified in Conditions for Setting the DTC.
  3. Observe the Diagnostic Trouble Code (DTC) information with a scan tool.

Did the DTC fail this ignition?		 - Go to Step 4. Go to Step 3.
3
  1. Observe the Freeze Frame / Failure Records for this DTC.
  2. Turn the ignition OFF for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Setting the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame / Failure Records.

Did the DTC fail this ignition?		 - Go to Step 4. Go to Diagnostic Aids .
4
  1. Operate the engine above 1,200 rpm for 30 seconds.
  2. Observe the appropriate rear Heated Oxygen Sensor (HO2S) voltage with a scan tool.

Is the voltage more than the specified value?		 60 mV Go to Step 7. Go to Step 5.
5
  1. Turn the ignition OFF.
  2. Disconnect the appropriate HO2S.
  3. Turn the ignition ON, with the engine OFF.
  4. Observe the HO2S voltage parameter with a scan tool.

Is the voltage within the specified range?		 350 - 550 mV Go to Step 12. Go to Step 6.
6 Test the appropriate HO2S signal circuit for a short to voltage.
Did you find and correct the condition?		 - Go to Step 19. Go to Step 14.
7 Inspect the rear HO2S for being connected to the correct bank of the engine.
If the sensors are connected to the incorrect bank, swap the connectors as necessary.
Did you find and correct the condition?		 - Go to Step 19. Go to Step 8.
8 Move the related HO2S harnesses for the front sensor between the HO2S harness connector and the Engine Control Module (ECM) while monitoring the appropriate HO2S lambda parameter.
Does the HO2S parameter change abruptly while moving the related harnesses?		 - Go to Step 15. Go to Step 9.
9 Move the related HO2S harnesses for the rear sensor between the HO2S harness connector and the ECM while monitoring the appropriate HO2S voltage parameter.
Does the HO2S parameter change abruptly while moving the related harnesses?		 - Go to Step 15. Go to Step 10.
10
  1. Turn the ignition OFF.
  2. Disconnect the heated oxygen sensors.
  3. Inspect the front and rear heated oxygen sensors for the following conditions:

    Damaged wiring between the HO2S and the ECM.

    Terminal corrosion or water intrusion in the HO2S harness connectors.

    The correct terminal tension.

    The HO2S is securely installed.

    Any exhaust leaks.

  4. Repair as necessary.

Did you find and correct the condition?		 - Go to Step 19. Go to Step 11.
11
  1. Disconnect the ECM.
  2. Test the appropriate front HO2S circuits for being shorted together between the HO2S connector and the ECM.

Did you find and correct the condition?		 - Go to Step 19. Go to Step 13.
12 Test for shorted terminals and for poor connections at the HO2S.
Did you find and correct the condition?		 - Go to Step 19. Go to Step 17.
13 Test for shorted terminals and for poor connections at the ECM.
Did you find and correct the condition?		 - Go to Step 19. Go to Step 16.
14 Test for shorted terminals and for poor connections at the ECM.
Did you find and correct the condition?		 - Go to Step 19. Go to Step 18.
15 Repair the circuit as necessary.
Did you complete the repair?		 - Go to Step 19. -
16 Replace the HO2S Bank 2 Sensor 1.
Did you complete the replacement?		 - Go to Step 19. -
17 Replace the HO2S Bank 2 Sensor 2.
Did you complete the replacement?		 - Go to Step 19. -
18 Replace the ECM.
Did you complete the replacement?		 - Go to Step 19. -
19
  1. Clear the DTCs with a scan tool.
  2. Turn the ignition OFF for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Setting the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame / Failure Records.

Did the DTC fail this ignition?		 - Go to Step 2. Go to Step 20.
20 Check if any additional DTCs are set.
Are any DTCs displayed that have not been diagnosed?		 - Go to applicable DTC Table . System OK
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