Diagnostic procedure

DTC P0140 DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED Have the FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS (HO2S related) been recorded?	Yes	Go to the next step.
1		No	Record the FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS on the repair order, then go to the next step.
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY Verify related service Bulletins and/or on-line repair information availability. Is any related repair information available?	Yes	Perform the repair or diagnosis according to the available repair information. If the vehicle is not repaired, go to the next step.
2		No	Go to the next step.
3	VERIFY RELATED PENDING AND STORED DTC NOTE: If the fuel monitor, DTC P0132 is retrieved, ignore it until P0140 is fixed. Turn the ignition switch off, then to the ON position. (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 ).
3		No	Go to the next step.
4	IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA Is DTC P0140 on the FREEZE FRAME DATA?	Yes	Go to the next step.
4		No	Go to troubleshooting procedures for the DTC on the FREEZE FRAME DATA. (See DTC TABLE ).
5	VERIFY CURRENT INPUT SIGNAL STATUS Warm up the engine. Access the O2S12 or the P0140 PID using the WDS or equivalent. Verify the PID while racing the engine at least 10 times in NEUTRAL Is the PID reading normal? More than 0.55 V at least once during engine racing	Yes	Go to Step 8.
5		No	Go to the next step.
6	INSPECT INSTALLATION OF REAR HO2S Check if the rear HO2S is loosely installed. Is the sensor installed securely?	Yes	Go to the next step.
6		No	Install the sensor securely, then go to Step 10.
7	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 part, then go to Step 10.
7		No	Inspect the following wiring harnesses for an open or short to the ground circuit, repair or replace the wiring harness if necessary. Rear HO2S terminal A (wiring harness-side) to PCM terminal 1Y (wiring harness-side) Repair or replace the wiring harness if necessary. If all items above are normal, replace the malfunctioning sensor. Then go to Step 10.
8	INSPECT SEALING OF ENGINE COOLANT PASSAGE Perform the ENGINE COOLANT LEAKAGE INSPECTION. (See ENGINE COOLANT LEAKAGE INSPECTION ). Is the cooling system hold pressure normal?	Yes	Repair or the replace the malfunctioning part according to the inspection result. Then go to Step 10.
8		No	Go to the next step.
9	INSPECT ENGINE COMPRESSION Inspect the engine compression. (See COMPRESSION INSPECTION ). Is it normal?	Yes	Go to the next step.
9		No	Perform engine overhaul for repairs, then go to the next step.
10	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 WDS or equivalent. Perform the HO2S heater, HO2S, and TWC Repair Verification Drive Mode. (See OBD-II DRIVE MODE ). Is the PENDING CODE for this DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION ).
10		No	Go to the next step.
11	VERIFY AFTER REPAIR PROCEDURE Perform the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE ). Are any DTCs present?	Yes	Go to the applicable DTC troubleshooting. (See DTC TABLE ).
11		No	Troubleshooting completed.