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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 the repair order, then go to the next step.
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2
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VERIFY 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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IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA
• Is DTC P0138 on the FREEZE FRAME DATA?
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Yes
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Go to the next step.
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No
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Go to the FREEZE FRAME DATA DTC inspection.
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4
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CHECK HO2S SIGNAL LEVEL TOO HIGH
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Note
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• Fuel calculations can be affected by abnormal air leaks.
• Carefully inspect the following areas for potential air leaks:
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- Hoses connecting to MAF sensor assembly.
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- Hoses connecting to throttle body.
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- Intake manifold gasket leaks.
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- PCV disconnected.
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- The vacuum lines are disconnected.
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- Improperly seated engine oil dipstick, tube or oil fill cap.
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- Exhaust gas leaks at flanges and gaskets.
• Raise the vehicle on a hoist and make sure the vehicle is level.
• Visually inspect for the following:
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- Exhaust leaks at flanges and gaskets.
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- HO2S-12 not torqued to specification.
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- Physical exhaust system concerns.
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- Aftermarket exhaust.
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- Punctures or cracks in the catalyst.
• Where any of the above conditions or concerns found during inspection?
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Yes
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Repair or replace malfunctioning part, then go to Step 10.
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No
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Go to the next step.
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5
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CHECK FOR HO2S-12 CIRCUIT FOR SHORT TO GND IN HARNESS
• Disconnect the PCM and HO2S-12 connectors.
• Measure the resistance between the following the PCM terminals at the harness side connector
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- Between 35 and battery negative post
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- Between 35 and 71, 91, 95
• Is the resistance above 10,000 ohms?
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Yes
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Go to the next step.
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No
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Repair short circuit, then go to Step 10.
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6
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CHECK HO2S-12 CIRCUIT FOR OPEN IN HARNESS
• Measure the resistance between the following at the harness side connector.
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- Between the PCM terminal 95 and HO2S-12 terminal 2
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- Between the PCM terminal 71 and HO2S-12 terminal 1
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- Between the PCM terminal 35 and HO2S-12 terminal 4
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- Between the PCM terminal 91 and HO2S-12 terminal 3
• Is the resistances below 5.0 ohms?
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Yes
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Go to the next step.
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No
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Repair open circuit, then go to Step 10.
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7
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CHECK HO2S-12 CIRCUIT VOLTAGE
• Connect the PCM and HO2S-12 connectors.
• Start the engine.
• Access the HO2S12 PID using the WDS or equivalent
• Is the HO2S12 PID greater than 1.5 V?
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Yes
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Go to Step 9.
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No
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Go to the next step.
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8
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CHECK HO2S-11 CIRCUIT VOLTAGE
• Disconnect the HO2S-11 connector.
• Place a jumper wire between terminal 2 and 3 at the HO2S-11 harness side connector.
• Start the engine.
• Access the HO2S12 PID using the WDS or equivalent
• Is the HO2S12 PID greater than 1.5 V?
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Yes
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Replace the HO2S-12, then go to Step 10.
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No
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Intermittent concerns exist, then go to Step 10.
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9
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CHECK FOR OVER VOLTAGE IN THE PCM
• Start the engine.
• Disconnect the HO2S-12 connector.
• Measure the voltage between the following terminals at the harness side connector.
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- Between HO2S-12 terminal 4 and battery negative post.
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- Between HO2S-12 terminal 3 and battery negative post.
• Is the voltage below 1.5 V?
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Yes
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Replace the HO2S-12, then go to the next step.
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No
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Intermittent concerns exist, then go to the next step.
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10
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VERIFY TROUBLESHOOTING OF DTC P0138 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the PCM memory using the WDS or equivalent.
• Drive the vehicle at 64 km/h {40 MPH} for at least 5 minutes.
• Is the PENDING CODE same 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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11
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VERIFY AFTER REPAIR PROCEDURE
• Perform "AFTER REPAIR PROCEDURE".
• Is there any DTC present?
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Yes
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Go to the applicable DTC inspection.
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No
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Troubleshooting completed.
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