DTC P0133 [L3]


DTC P0133	Front HO2S circuit malfunction
DETECTION CONDITION	• The PCM monitors inversion cycle period, lean-to-rich response time and rich-to-lean response time of the sensor. The PCM calculates the average of the inversion cycle period-specified inversion cycles, average response time from lean-to-rich, and from rich-to-lean when the following conditions are met. If any exceeds threshold, the PCM determines that circuit has malfunction. MONITORING CONDITIONS - Drive mode 3 - Following conditions are met: • Calculation load 19.5- 59.4% (^1) • Engine speed 1,500- 4,000 rpm* • Vehicle speed is above 3.76 km/h • Engine coolant temperature is above -10 °C {14 °F} • Front HO2S signal inversion cycle is above 10 cycles ^1: Maximum calculated load value varies depending on engine speed Diagnostic support note* • This is an intermittent monitor. (OXYGEN SENSOR) • MIL illuminates if 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. • DIAGNOSTIC MONITORING TEST RESULTS is available. • PENDING CODE is available if PCM detects the above malfunction condition during first drive cycle. • FREEZE FRAME DATA is available. • DTC is stored in the PCM memory.
POSSIBLE CAUSE	• Front HO2S deterioration • Front HO2S heater malfunction • Pressure regulator malfunction • Fuel pump malfunction • Fuel filter clogged or restricted • Fuel leakage in fuel line from fuel distribution pipe and fuel pump • Leakage in exhaust system • Purge solenoid valve malfunction • Purge solenoid hoses improper connection • Insufficient compression • Engine malfunction


STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded?	Yes	Go to the next step.
1		No	Record FREEZE FRAME DATA on repair order, then go to the next step.
2	VERIFY RELATED SERVICE INFORMATION AVAILABILITY • Check for related Service Information availability. • Is any related Service Information available?	Yes	Perform repair or diagnosis according to available Service Information. • If vehicle is not repaired, go to the next step.
2		No	Go to the next step.
3	VERIFY RELATED PENDING AND STORED DTCS • Turn the ignition switch off, then to the ON position (Engine off). • Verify pending and /or stored DTCs using WDS or equivalent. • Is DTC P0443 also present?	Yes	Go to DTC P0443 troubleshooting procedures, then go to Step 13.
3		No	Go to the next step.
4	IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA • Is DTC P0133 on FREEZE FRAME DATA?	Yes	Go to the next step.
4		No	Go to troubleshooting procedures for DTC on FREEZE FRAME DATA. (See DTC TABLE [L3].)
5	VERIFY CURRENT INPUT SIGNAL STATUS • Warm up the engine. • Access O2S11 PID using WDS or equivalent. • Inspect PID under following accelerator pedal conditions (in NEUTRAL). • Is PID reading normal? - More than 0.55 V when the accelerator pedal is suddenly depressed (rich condition). - Less than 0.55 V just after release of the accelerator pedal (lean condition).	Yes	Go to step 8.
5		No	Go to the next step.
6	INSPECT INSTALLATION OF FRONT HO2S • Inspect if the front HO2S is loosely installed. • Is the sensor installed securely?	Yes	Go to the next step.
6		No	Retighten the sensor, then go to Step 13.
7	INSPECT GAS LEAKAGE FROM EXHAUST SYSTEM • Visually inspect if any gas leakage is found between the exhaust manifold and the front HO2S. • Is there any gas leakage?	Yes	Repair or replace any malfunctioning exhaust parts, then go to Step 13.
7		No	Replace the sensor, then go to Step 13.
8	INSPECT LONG TERM FUEL TRIM • Access LONGFT1 PIDs • Compare it with FREEZE FRAME DATA recorded at Step 1. • Is it below FFD value?	Yes	The engine is operating under rich condition. Go to the next step.
8		No	The engine is operating under lean condition. Go to Step 10.
9	INSPECT FUEL LINE PRESSURE (EXCESSIVE FUEL LINE PRESSURE) • Turn the ignition switch off. • Inspect fuel line pressure while the engine is running. (See FUEL LINE PRESSURE INSPECTION [L3].) • Is fuel line pressure normal?	Yes	Go to the next step.
9		No	Inspect fuel pump maximum pressure. (See FUEL PUMP UNIT INSPECTION [L3].) • If any problem is found, repair or replace suspected parts. • If all items above are normal, replace the fuel pump unit. Then go to Step 13.
10	INSPECT FUEL LINE PRESSURE (LOW FUEL LINE PRESSURE) • Turn the ignition switch off. • Inspect fuel line pressure while the engine is running. (See FUEL LINE PRESSURE INSPECTION [L3].) • Is fuel line pressure normal?	Yes	Go to step 13.
10		No	Go to the next step.
11	INSPECT FUEL LINE FROM FUEL PUMP TO FUEL DELIVERY PIPE • Visually inspect fuel line for any leakage. • Is any fuel leakage found?	Yes	Replace the fuel line, then go to Step 13.
11		No	Inspect the fuel filters for the following: • Restriction or clogging in the fuel filter (high-pressure side) • Foreign materials or clogging in the fuel filter (low-pressure side) Perform the following actions according to result. • If restriction or clogging is found in the fuel filter (high-pressure side), replace the fuel pump unit. • If foreign material or clogging is found in the fuel filter (low-pressure side), clean out the fuel tank and filter. • If all items above are normal, replace the fuel pump unit. Then go to Step 13.
12	INSPECT SEALING OF ENGINE COOLANT PASSAGE Warning • Removing radiator cap when radiator is hot is dangerous. Scalding coolant and steam may shoot out and cause serious injury. • When removing radiator cap, wrap a thick cloth around and turn it slowly. • Remove the radiator cap. • Implement procedure to bleed air from engine coolant, then run the engine at idle. • Are there any small bubbles, which makes engine coolant white at filler opening? Note • Large bubbles are normal since they are due to remaining air being released from engine coolant passage.	Yes	Air gets in due to poor sealing of head gasket or other areas between combustion chamber and engine coolant passage. Repair or replace the malfunctioning parts, then go to the next step.
12		No	Go to the next step.
13	VERIFY TROUBLESHOOTING OF DTC P0133 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 WDS or equivalent. • Run OBD DRIVE MODE. • Is PENDING CODE of same DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [L3].)
13		No	Go to the next step.
14	VERIFY AFTER REPAIR PROCEDURE • Perform "After Repair Procedure". (See AFTER REPAIR PROCEDURE [L3].) • Is there DTC present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [L3].)
14		No	Troubleshooting completed.