DTC P0133 [L8, LF]

id0102b1804800

DTC P0133 | A/F sensor circuit problem
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DETECTION CONDITION | • The PCM monitors the A/F sensor current slow response while A/F fluctuation being provided when the following monitoring conditions are met. If the average value of slow response and/or delayed response is more than specified value, the PCM determines the A/F sensor has a deterioration. MONITORING CONDITIONS ― Drive Mode 03 (A/F sensor heater, HO2S heater, A/F sensor, HO2S and TWC Repair Verification) ― Following conditions are met: • Engine speed: 1,750—3,500 rpm • Charging efficiency: 19—63% (at engine speed 2,500 rpm) • Engine coolant temperature: above 60 °C {140 °F} • A/F sensor heater monitor is completed. • Fuel system loop status is closed loop fuel control. 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 the first drive cycle. • FREEZE FRAME DATA (Mode 2/Mode 12) is available. • The DTC is stored in the PCM memory.
POSSIBLE CAUSE | • A/F sensor connector or terminals malfunction • A/F sensor malfunction ― A/F sensor looseness • Exhaust system leakage • Fuel supply system malfunction or improper fuel line malfunction ― Pressure regulator (built-in fuel pump unit) malfunction ― Clogged or restricted fuel filter (built-in fuel pump unit) ― Fuel leakage in fuel line between fuel distribution pipe and fuel pump • Purge system malfunction ― Purge solenoid valve malfunction ― Improper connection purge solenoid hose • Engine malfunction ― Engine coolant leakage ― Insufficient compression • A/F sensor deterioration • PCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | VERIFY FREEZE FRAME DATA (MODE 12) AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED • Have the FREEZE FRAME DATA (Mode 12) and DIAGNOSTIC MONITORING TEST RESULTS (A/F sensor, HO2S related) been recorded? | Yes | Go to the next step.
No | Record the FREEZE FRAME DATA (Mode 12) and DIAGNOSTIC MONITORING TEST RESULTS on repair order, then go to the next step.
2 | VERIFY RELATED SERVICE INFORMATION AVAILABILITY • Verify related Service Information availability. • Is any related Service Information available? | Yes | Perform repair or diagnosis according to the available Service Information. • If the vehicle is not repaired, go to the next step.
No | Go to the next step.
3 | VERIFY RELATED PENDING CODE AND STORED DTC • Turn the ignition switch off, then to the ON position (engine off). • Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure. (See ON-BOARD DIAGNOSTIC TEST [L8, LF].) • Is the DTC P0443 also present? | Yes | Go to the applicable DTC troubleshooting. (See DTC P0443 [L8, LF].)
No | Go to the next step.
4 | IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA (MODE 2) • Perform the Freeze Frame PID Data Access Procedure. (See ON-BOARD DIAGNOSTIC TEST [L8, LF].) • Is the DTC P0133 on FREEZE FRAME DATA (Mode 2)? | Yes | Go to the next step.
No | Go to the DTC troubleshooting on FREEZE FRAME DATA (Mode 2). (See DTC TABLE [L8, LF].)
5 | INSPECT A/F SENSOR CONNECTOR AND TERMINALS • Turn the ignition switch off. • Disconnect the A/F sensor connector. • Inspect for poor connection (such as damaged/pulled-out pins, and corrosion). • Is there any malfunction? | Yes | Repair or replace the connector or terminals, then go to Step 16.
No | Go to the next step.
6 | INSPECT INSTALLATION OF A/F SENSOR • Inspect if the A/F sensor is loosely installed. • Is the A/F sensor installed securely? | Yes | Go to the next step.
No | Retighten the A/F sensor, then go to Step 16.
7 | INSPECT GAS LEAKAGE FROM EXHAUST SYSTEM • Visually inspect if there is any gas leakage is found between the exhaust manifold and A/F sensor. • Is there gas leakage? | Yes | Repair or replace the malfunctioning part according to the inspection results, then go to Step 16. (See EXHAUST SYSTEM REMOVAL/INSTALLATION [L8, LF].)
No | Go to the next step.
8 | INSPECT LONG TERM FUEL TRIM • Perform the Freeze Frame PID Data Access Procedure and access the LONGFT1 PID. (See ON-BOARD DIAGNOSTIC TEST [L8, LF].) • Compare it with the FREEZE FRAME DATA (Mode 2) recorded at Step 1. • Is it below the FREEZE FRAME DATA (Mode 2) value? | Yes | The engine is driven under rich condition. • Go to the next step.
No | The engine is driven under lean condition. • Go to Step 10.
9 | INSPECT FUEL LINE PRESSURE (EXCESSIVE FUEL LINE PRESSURE) • Turn the ignition switch off. • Inspect the fuel line pressure while the engine running. (See FUEL LINE PRESSURE INSPECTION [L8, LF].) • Is the fuel line pressure normal? | Yes | Go to Step 12.
No | Inspect the fuel pump maximum pressure, and fuel return pipe for clogging. (See FUEL PUMP UNIT INSPECTION [L8, LF].) If there is any problem: • Repair or replace the malfunctioning part according to the inspection results. If all items above are normal: • Replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [L8, LF].) Go to Step 16.
10 | INSPECT FUEL LINE PRESSURE (LOW FUEL LINE PRESSURE) • Turn the ignition switch off. • Inspect the fuel line pressure while the engine running. (See FUEL LINE PRESSURE INSPECTION [L8, LF].) • Is the fuel line pressure normal? | Yes | Go to Step 12.
No | Go to the next step.
11 | INSPECT FUEL LINE FROM FUEL PUMP TO FUEL DISTRIBUTOR • Visually inspect the fuel line for any leakage. • Is there fuel leakage? | Yes | Replace the fuel line, then go to Step 16.
No | Inspect the fuel filters for the foreign material or stain inside the fuel filter (low-pressure side). If foreign material or stain is found inside the fuel filter (low-pressure side): • Clean the fuel tank and fuel filter. If normal: • Replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [L8, LF].) Go to Step 16.
12 | INSPECT PURGE SOLENOID VALVE AND VACUUM HOSE • Inspect the purge solenoid valve and vacuum hose connection. (See PURGE SOLENOID VALVE INSPECTION [L8, LF].) • Is there any malfunction? | Yes | Repair or replace the malfunctioning part according to the inspection results, then go to Step 16. (See PURGE SOLENOID VALVE REMOVAL/INSTALLATION [L8, LF].)
No | Go to the next step.
13 | INSPECT SEALING OF ENGINE COOLANT PASSAGE • Perform the “ENGINE COOLANT LEAKAGE INSPECTION”. (See ENGINE COOLANT LEAKAGE INSPECTION [L8, LF].) • Is there any malfunction? | Yes | Repair or replace the malfunctioning part according to the inspection results, then go to Step 16.
No | Go to the next step.
14 | INSPECT ENGINE COMPRESSION • Inspect engine compression. (See COMPRESSION INSPECTION [L8, LF].) • Is there any malfunction? | Yes | Perform the engine overhaul for repairs, then go to Step 16.
No | Go to the next step.
15 | INSPECT A/F SENSOR • Inspect the A/F sensor. (See AIR FUEL RATIO (A/F) SENSOR INSPECTION [L8, LF].) • Is there any malfunction? | Yes | Replace the A/F sensor, then go to the next step. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [L8, LF].)
No | Go to the next step.
16 | VERIFY DTC TROUBLESHOOTING COMPLETED • Make sure to reconnect all disconnected connectors. • Turn the ignition switch to the ON position. (engine off). • Clear the DTC from the PCM memory using the M-MDS. (See AFTER REPAIR PROCEDURE [L8, LF].) • Perform the Drive Mode 03 (A/F sensor heater, HO2S heater, A/F sensor, HO2S and TWC Repair Verification). (See OBD DRIVE MODE [L8, LF].) • Is the PENDING CODE for this DTC present? | Yes | Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [L8, LF].)
No | Go to the next step.
17 | VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [L8, LF].) • Are any DTCs present? | Yes | Go to the applicable DTC troubleshooting. (See DTC TABLE [L8, LF].)
No | DTC troubleshooting completed.