DTC P0140 [L3 Turbo]
id0102b7805300
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DTC P0140 |
HO2S no activity detected |
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DETECTION CONDITION
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• The PCM monitors the input voltage from the HO2S when the following conditions are met. Under the following monitoring conditions, if the input voltage from the HO2S does not even exceed 0.55 V though the short term fuel trim is controlled up to 20.5% for 9.6 s, the PCM determines that sensor circuit is not activated.
MONITORING CONDITIONS
Diagnostic support note
• This is an intermittent monitor (A/F sensor, HO2S).
• The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
• PENDING CODE is available if the PCM detects the above malfunction condition during first drive cycle.
• FREEZE FRAME DATA is available.
• DTCs are stored in the PCM memory.
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POSSIBLE CAUSE
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• HO2S looseness
• Exhaust system leakage
• Open circuit or short to ground in the wiring harness between HO2S terminal A and PCM terminal 2Q
• HO2S deterioration
• HO2S malfunction
• Engine malfunction (Engine coolant leakage)
• Insufficient compression
• PCM malfunction
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Diagnostic procedure
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STEP |
INSPECTION |
ACTION |
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1
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VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED
• Have the FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS (A/F sensor, HO2S related) 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 and DIAGNOSTIC MONITORING TEST RESULTS 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 the 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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VERIFY RELATED PENDING AND STORED DTC
• Turn the ignition switch off, then to the ON position. (Engine off)
• Verify pending and stored DTCs using the M-MDS.
• Are other DTCs present?
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Yes
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No
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Go to the next step.
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4
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IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA
• Is DTC P0140 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 troubleshooting procedures for the DTC on the FREEZE FRAME DATA.
(SeeDTC TABLE [L3 Turbo].)
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5
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INSPECT HO2S
• Inspect the HO2S.
• Is there any malfunction?
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Yes
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Go to Step 8.
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No
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Go to the next step.
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6
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INSPECT INSTALLATION OF HO2S
• Check if the HO2S is loosely installed.
• Is the sensor installed securely?
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Yes
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Go to the next step.
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No
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Install the sensor securely, then go to Step 10.
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7
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INSPECT GAS LEAKAGE FROM EXHAUST SYSTEM
• Visually check if any gas leakage is found between the exhaust pipe and the HO2S.
• Is there gas leakage?
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Yes
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Repair or replace any malfunctioning exhaust part, then go to Step 10.
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No
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• Inspect the following wiring harness for an open or short to the ground circuit, repair or replace the wiring harness if necessary.
• If all items above are normal, replace the HO2S.
Then go to Step 10.
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8
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INSPECT SEALING OF ENGINE COOLANT PASSAGE
• Perform the ENGINE COOLANT LEAKAGE INSPECTION.
• Is the cooling system hold pressure normal?
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Yes
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Repair or the replace the malfunctioning part according to the inspection result.
Then go to Step 10.
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No
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Go to the next step.
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9
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INSPECT ENGINE COMPRESSION
• Inspect the engine compression.
• 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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Perform engine overhaul for repairs, then go to the next step.
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10
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VERIFY TROUBLESHOOTING OF DTC P0140 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 M-MDS.
• Perform the A/F sensor heater, HO2S heater, A/F sensor, HO2S, and TWC Repair Verification Drive Mode.
• 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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11
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VERIFY AFTER REPAIR PROCEDURE
• Perform the “AFTER REPAIR PROCEDURE”.
• Are any DTCs present?
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Yes
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Go to the applicable DTC troubleshooting.
(SeeDTC TABLE [L3 Turbo].)
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No
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Troubleshooting completed.
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