Diagnostic procedure
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STEP
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INSPECTION
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ACTION
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1
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VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
• Has FREEZE FRAME DATA been recorded?
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Yes
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Go to the next step.
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No
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Record the FREEZE FRAME DATA on repair order, then go to the next step.
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2
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VERIFY RELATED REPAIR INFORMATION AVAILABILITY
• Verify related service repair information availability.
• Is any related repair information available?
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Yes
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Perform repair or diagnosis according to the available repair information.
• If the vehicle is not repaired, go to the next step.
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No
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Go to the next step.
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3
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VERIFY RELATED PENDING CODE OR STORED DTC
• Turn the ignition switch off then to the ON position (Engine off).
• Verify related pending code or stored DTCs.
• Are other DTCs present?
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Yes
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Go to appropriate DTC troubleshooting.
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No
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Go to the next step.
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4
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INSPECT GAS LEAKAGE OF EXHAUST SYSTEM
• Visually inspect exhaust gas leakage in the exhaust system.
• Is there gas leakage?
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Yes
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Repair or replace the malfunctioning exhaust part, then go to Step 7.
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No
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Go to the next step.
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5
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INSPECT INSTALLATION OF FRONT AND REAR OXYGEN SENSORS
• Inspect for looseness of front and rear oxygen sensors.
• Is it normal?
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Yes
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Go to the next step.
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No
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Retighten the sensor, then go to Step 7.
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6
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INSPECT TWC
• Clear the DTC using the WDS or equivalent generic OBD function.
• Turn the ignition switch off then back to the ON position.
• Inspect the TWC.
• Is it normal?
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Yes
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Replace the heated oxygen sensor, then go to the next step.
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No
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Replace the TWC, then go to the next step.
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7
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VERIFY TROUBLESHOOTING OF DTC P0420 OR P0431 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Turn the ignition switch to the ON position (Engine off).
• Clear the DTC from the memory using the WDS or equivalent.
• Perform the HO2S heater, HO2S, and TWC Repair Verification Drive Mode. (See OBD DRIVE MODE [LF, L3].)
• Is the PENDING CODE for this DTC present?
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Yes
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Replace the PCM, then go to the next step.
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No
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Go to the next step.
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8
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VERIFY AFTER REPAIR PROCEDURE
• Perform the "After Repair Procedure".
• Are any DTC present?
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Yes
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Go to the applicable DTC troubleshooting.
(See DTC TABLE [LF, L3].)
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No
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Troubleshooting completed.
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