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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 FREEZE FRAME DATA on the repair order, then go to the next step.
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2
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VERIFY RELATED SERVICE INFORMATION AVAILABILITY
• Verify related Service Information availability.
• Is any related Service Information available?
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Yes
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Perform repair or diagnosis according to the available Service 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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INSPECT FOR SOURCE OF POTENTIAL HO2S CONTAMINATION
• Investigate the following items as potential sources of HO2S contamination:
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― Use of unapproved silicon sealers
― Fuel contaminated by silicon additives
― Excessive oil consumption
― Glycol leaking internally in the engine
― Lead-contaminated fuel
― Short drive cycles in cold weather
― Use of unapproved cleaning agents
• Is a concern present?
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Yes
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Repair the source of the contamination. Change the engine oil and oil filter. Then go to the next step.
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No
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Go to the next step.
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4
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VISUALLY INSPECT HO2S WIRING HARNESS
• Connect the PCM connector.
• Visually inspect the HO2S wiring harness for exposed wiring water contamination, corrosion, and proper assembly.
• Is a concern present?
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Yes
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Repair or replace suspected part, then go to Step 12.
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No
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Go to the next step.
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5
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INSPECT POWER SUPPLY IN WIRING HARNESS
• Disconnect suspect HO2S connector.
• Turn the ignition switch to the ON position (Engine off).
• Measure the voltage between suspect HO2S connector terminal A and C, on the wiring harness side.
• Is the voltage more than 10 V?
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Yes
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Turn the ignition switch off. Go to the next step.
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No
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Repair or replace suspected part. Go to Step 12.
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6
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INSPECT HO2S HEATER FOR SHORT TO GROUND
• Disconnect the PCM connector.
• Measure the resistance between HO2S terminal A on the wiring harness side and body ground.
• Is the resistance more than 10 kilohms?
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Yes
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Go to the next step.
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No
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Repair or replace suspected part. Go to Step 12.
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7
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INSPECT HO2S HEATER FOR SHORT IN WIRING HARNESS
• Measure the resistance between the following terminals:
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― HO2S terminal A (wiring harness-side) and HO2S terminal C (wiring harness-side)
― HO2S terminal A (wiring harness-side) and HO2S terminal D (wiring harness-side)
― HO2S terminal A (wiring harness-side) and HO2S terminal B (wiring harness-side)
• Are the resistances more than 10 kilohms?
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Yes
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Go to the next step.
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No
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Repair or replace suspected part. Go to Step 12.
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8
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INSPECT HO2S HEATER CIRCUIT FOR OPEN CIRCUIT IN WIRING HARNESS
• For DTC P0135, measure the resistance between PCM terminal 2J and front HO2S (RH) terminal A.
• For DTC P0141, measure the resistance between PCM terminal 2AS and rear HO2S (RH) terminal A.
• For DTC P0155, measure the resistance between PCM terminal 2E and front HO2S (LH) terminal A.
• For DTC P0161, measure the resistance between PCM terminal 2AO and rear HO2S (LH) terminal A.
• Is the resistance less than 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 or replace suspected part. Go to Step 12.
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9
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INSPECT INTERNAL RESISTANCE OF HO2S HEATER
• Measure the resistance between the suspect HO2S terminal A and C, on the component side.
• Is the resistance between 3—30 ohms?
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Yes
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Go to the next step.
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No
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Replace HO2S.
Go to Step 12.
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10
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INSPECT HO2S CASE FOR SHORT TO POWER SUPPLY, HTR, AND SIGNRTN
• Measure the resistance between the suspect HO2S terminal A and D at component side.
• Measure the resistance between the suspect HO2S terminal A and body ground.
• Is the resistance more than 10 kilohms?
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Yes
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Go to the next step.
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No
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Replace HO2S.
Go to the next step.
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11
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INSPECT FOR CORRECT PCM OPERATION
• Disconnect all the PCM connectors.
• Visually inspect for:
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― Pushed out pins
― Corrosion
• Connect all the PCM connectors and verify that they seat correctly.
• Retrieve DTCs using the M-MDS.
• Is the PENDING CODE for this DTC present?
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Yes
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Go to the next step.
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No
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The system is correctly. Go to the next step.
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12
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VERIFY TROUBLESHOOTING OF DTC P0135, P0141, P0155 or P0161 HAS BEEN COMPLETED
• Verify that all disconnected connectors are reconnected.
• Turn the ignition switch to the ON position (Engine off).
• Clear the DTC from the PCM memory using the M-MDS.
• Retrieve DTCs using the M-MDS.
• Is the PENDING CODE for this DTC present?
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Yes
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Replace 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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13
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VERIFY AFTER REPAIR PROCEDURE
• Perform “AFTER REPAIR PROCEDURE”.
• Are 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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