P0133
DTC P0133 HO2S CIRCUIT SLOW RESPONSE (BANK 1 / SENSOR 1)Component Location:
GENERAL DESCRIPTION
The heated oxygen sensors are mounted on the front side and the rear side of Catalytic Converter (warm-up catalytic converter), which detects the oxygen concentration in the exhaust gas. The front HO2S signal is used to control air/fuel ratio (closed loop fuel control) and the rear HO2S signal is used to monitor front HO2S and catalyst for proper operation. The heated oxygen sensor (HO2S) produces a voltage that varies between 0 V and 1 V. When the air/fuel ratio is lean, the oxygen concentration in the exhaust gas increases and the front HO2S outputs a low voltage (approximately 0 - 0.4 V). When the air/fuel ratio is rich, the oxygen concentration in the exhaust gas decreases and the front HO2S outputs a high voltage (approximately 0.6 - 1 V). The ECM/PCM constantly monitors the HO2S and increases or decreases the fuel injection duration by using the HO2S signal, which is called closed-loop fuel control operation.
DTC DESCRIPTION
If there is abnormal response rate of HO2S under enable conditions, ECM/PCM sets DTC P0133.(This DTC might be caused by the malfunction of Heater circuit, so, check the heater circuit first).
DTC Detecting Condition:
Specification:
Schematic Diagram (A/T):
Schematic Diagram (M/T):
Signal Waveform & Data:
SIGNAL WAVEFORM & DATA
If you release the accelerator pedal suddenly after engine running about 4000 rpm, fuel supply will stop for short period and the O2 sensor service data in the Hi-Scan (Pro) will display values 200 mV or lower. When you suddenly press on the accelerator pedal down, the voltage will reach 0.6 - 1.0 V. When you let the engine idle again, the voltage will fluctuate between 200 mV or lower and 0.6 - 1.0 V. In this case, the O2 sensor can be determined as good.
MONITOR SCANTOOL DATA
1. Connect scantool to DLC (Data Link Cable).
2. Warm up the engine to normal operating temperature.
3. Monitor "HO2S (B1S1)" parameter on scantool.
4. Is the "HO2S (B1S1)" parameter operating correctly?
YES - Fault is intermittent caused by poor contact in the sensor's and/or ECM/PCM's connector or was repaired and ECM/PCM memory was not cleared. Thoroughly check connectors for looseness, poor connection, ending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.
NO - Go to "Terminal and Connector Inspection" procedure.
NOTE: This DTC might be caused by the malfunction of Heater circuit, so, check the heater circuit first.
SYSTEM INSPECTION
1. Check leakage or clog of air.
1. Check contamination, clog and installation of gasket
- Any damage or installation of throttle body gasket.
- Any damage or installation of gasket between intake manifold and surge tank.
- Clog or contamination of intake manifold and injector by foreign materials
- Contamination between surge tank and PCSV or stuck open condition of PCSV.
- Any damage or contamination of HO2S (B1/S1) by foreign materials.
2. Has a problem been found?
YES - Go to " Check Fuel Line" as follows.
NO - Repair or replace as necessary and then, go to "Verification of Vehicle Repair" procedure.
2. Check Fuel Line.
1. Check Clog, contamination and installation of Fuel Line as follows.
- Connection for each connectors in Fuel Line.
- Damage, interference and installation of vacuum hose connected to Fuel Line.
- Bend, Leakage and squeeze of pipe in Fuel Line.
2. Has a problem been found?
YES - Go to "Check Fuel Pressure" as follows.
NO - Repair or replace as necessary and then, go to "Verification of Vehicle Repair" procedure.
3. Check Fuel Pressure.
1. IG "OFF".
2. Disconnect fuel pump relay from junction box in passenger compartment.
3. Start engine and await until engine is off and then, IG "OFF".
4. Connect fuel pump relay again.
5. Connect fuel pressure gauge on the fuel filter with fuel pressure gauge adaptor.
6. Start engine again and measure fuel pressure.
Specification : Approx. 3.5 kgf/sq.cm
7. Is the fuel pressure normal?
YES - Go to "Component Inspection" procedure.
NO
- Check any damage of fuel return hose or pipe.
- Check for improper fuel pressure regulator operation.
- Repair or replace as necessary and then, go to 'Verification of Vehicle Repair" procedure.
COMPONENT INSPECTION
1. Check PCV.
1. IG "OFF"
2. Disconnect PCV.
3. Check that PCV is properly operating.
4. Is the PCV O.K?
YES - Go to "Check PCSV" as follows.
NO
- Substitute with a known - good PCV and check for proper operation.
- If the problem is corrected, replace PCV and go to "Verification of Vehicle Repair" procedure.
2. Check the PCSV.
1. Ignition "OFF".
2. Disconnect PCSV and Vacuum Hose.
3. Apply vacuum on PCSV with Hand Vacuum Gauge.
4. Is the PCSV keeping the Vacuum?
YES - Go to "Check Injector" as below.
NO - Substitute with a known-good PCSV and check for proper operation. If the problem is corrected, replace PCSV and then go to "Verification of Vehicle Repair" procedure.
3. Check Injector.
1. Ignition "OFF"
2. Remove Injector.
3. Check Leakage and clog on Injector.
Specification:
4. Measure resistance terminal 1 and 2 of lnjector connector (Component side).
5. Is the measured resistance within specifications?
YES - Go to "Check sensors related to Fuel Trim " as below.
NO - Substitute with a known-good lnjector and check for proper operation. If the problem is corrected, replace injector and then go to "Verification of Vehicle Repair" procedure.
4. Check Sensors related to Fuel Trim.
1. Check the Input Voltage of Sensors related to Fuel Trim (MAPS, TPS, ECTS, PCSV, Injector, and etc) - Refer to Trouble Shooting Guide -
2. Are the sensors related to Fuel Trim O.K?
YES - Go to "Check ECM/PCM" as below.
NO - Repair as necessary and go to "Verification of Vehicle Repair" procedure.
5. Check ECM/PCM.
1. IG "OFF" and disconnect B1S1 connector.
2. Connect scantool and Key "ON".
3. Select simulation function on scantool.
4. Simulate voltage at terminal 2 of HO2S (B1S1) sensor signal connector.
5. Is the HO2S(B1/S1) signal value changed according to simulation voltage?
YES - Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.
NO
- Substitute with a known-good ECM/PCM and check for proper operation.
- If the problem is corrected, replace ECM/PCM and then go to "Verification of Vehicle Repair" procedure.
VERIFICATION OF VEHICLE REPAIR
After a repair, it is essential to verify that the fault has been corrected.
1. Connect scan tool and select "Diagnostic Trouble Codes (DTCs)" mode.
2. Clear the DTCs and Operate the vehicle within DTC Enable conditions in General information.
3. Are any DTCs present?
YES - Go to the applicable troubleshooting procedure.
NO - System is performing to specification at this time