Diagnostic procedure
STEP
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INSPECTION
|
ACTION
|
|
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1
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PERFORM DTC CONFIRMATION PROCEDURE
• Perform the DTC CONFIRMATION PROCEDURE.
• Is the same DTC present?
|
Yes
|
Go to the next step.
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No
|
Intermittent concern exists. Go to the INTERMITTENT CONCERN TROUBLESHOOTING procedure.
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2
|
VERIFY RELATED PENDING AND STORED DTCS
• Turn the ignition switch to the OFF, then ON (Engine off).
• Verify pending and stored DTCs using the WDS or equivalent.
• Are other DTCs present?
|
Yes
|
Go to the appropriate DTC troubleshooting procedures.
(See DTC TABLE [LF, L3].)
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No
|
Go to the next step.
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||
3
|
IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA
• Is DTC P0140 displayed in the FREEZE FRAME DATA?
|
Yes
|
Go to the next step.
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No
|
Go to the troubleshooting procedures for DTC on FREEZE FRAME DATA.
(See DTC TABLE [LF, L3].)
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4
|
VERIFY CURRENT INPUT SIGNAL STATUS
• Warm up the engine.
• Access the O2S12 for P0140 or O2S22 for P0160 PID using the WDS or equivalent.
• Verify the PID while racing the engine at least 10 times (in NEUTRAL (MTX) or PARK (ATX)).
• Is the PID reading normal?
|
Yes
|
Go to step 7.
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No
|
Go to the next step.
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5
|
INSPECT INSTALLATION OF REAR HO2S
• Check if the rear HO2S is loosely installed.
• Is the sensor installed securely?
|
Yes
|
Go to the next step.
|
No
|
Install the sensor securely, then go to Step 9.
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6
|
INSPECT GAS LEAKAGE FROM EXHAUST SYSTEM
• Visually check if any gas leakage is found between the exhaust pipe and the rear HO2S.
• Is there gas leakage?
|
Yes
|
Repair or replace any malfunctioning exhaust parts, then go to Step 9.
|
No
|
• Inspect the following wiring harnesses for an open or short to ground circuit, Repair or replace the wiring harness if necessary.
• If all items above are normal, replace the malfunctioning sensor.
then go to Step 9.
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7
|
INSPECT SEALING OF ENGINE COOLANT PASSAGE
• Remove the radiator cap.
• Implement the procedure to bleed air from the engine coolant, then run the engine at idle.
• Are there any small bubbles that makes the engine coolant white at the filling opening?
|
Yes
|
Air penetrates due to from poor sealing of head gasket or other areas between combustion chamber and the engine coolant passage.
Repair or replace malfunctioning parts, then go to Step 9.
|
No
|
Go to the next step.
|
||
8
|
INSPECT ENGINE COMPRESSION
• Inspect the engine compression.
• Is it normal?
|
Yes
|
Go to the next step.
|
No
|
Implement the engine overhaul for repairs, then go to the next step.
|
||
9
|
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 memory using the WDS or equivalent.
• Perform the KOER self-test.
(See KOEO/KOER SELF-TEST [LF, L3].)
• Is the same DTC present?
|
Yes
|
Replace the PCM, then go to the next step.
|
No
|
Go to the next step.
|
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10
|
VERIFY AFTER REPAIR PROCEDURE
• Perform the "After Repair Procedure".
• Are any DTCs present?
|
Yes
|
Go to the applicable DTC troubleshooting.
(See DTC TABLE [LF, L3].)
|
No
|
Troubleshooting completed.
|