DTC P0133 [L3]


DTC P0133	Front HO2S circuit malfunction
DETECTION CONDITION	• PCM monitors inversion cycle period, lean-to-rich response time and rich-to-lean response time of the sensor. 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 following conditions are met. If any exceeds threshold, 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 next step.
1		No	Record FREEZE FRAME DATA on repair order, then go to 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 next step.
2		No	Go to next step.
3	VERIFY RELATED PENDING AND STORED DTCS • Turn ignition key to OFF, then ON (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 next step.
4	IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA • Is DTC P0133 on FREEZE FRAME DATA?	Yes	Go to 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 engine. • Access O2S11 PID using WDS or equivalent. • Inspect PID under following accelerator pedal conditions (in NEUTRAL). • Is PID reading okay? - More than 0.55 V when accelerator pedal is suddenly depressed (rich condition). - Less than 0.55 V just after release of accelerator pedal (lean condition).	Yes	Go to step 8.
5		No	Go to next step.
6	INSPECT INSTALLATION OF FRONT HO2S • Inspect if front HO2S is loosely installed. • Is sensor installed securely?	Yes	Go to next step.
6		No	Retighten sensor, then go to Step 13.
7	INSPECT GAS LEAKAGE FROM EXHAUST SYSTEM • Visually check if any gas leakage is found between exhaust manifold and front HO2S. • Is there any gas leakage?	Yes	Repair or replace any faulty exhaust parts, then go to Step 13.
7		No	Replace 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	Engine is operating under rich condition. Go to next step.
8		No	Engine is operating under lean condition. Go to Step 10.
9	INSPECT FUEL LINE PRESSURE (EXCESSIVE FUEL LINE PRESSURE) • Turn ignition key to OFF. • Inspect fuel line pressure while engine is running. (See FUEL LINE PRESSURE INSPECTION [L3].) • Is fuel line pressure okay?	Yes	Go to 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 okay, replace fuel pump unit. Then go to Step 13.
10	INSPECT FUEL LINE PRESSURE (LOW FUEL LINE PRESSURE) • Turn ignition key to OFF. • Inspect fuel line pressure while engine is running. (See FUEL LINE PRESSURE INSPECTION [L3].) • Is fuel line pressure okay?	Yes	Go to step 13.
10		No	Go to 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 suspected fuel line, then go to Step 13.
11		No	Inspect fuel filters for following: • Restriction or clogging in fuel filter (high-pressure side) • Foreign materials or clogging in fuel filter (low-pressure side) Perform following actions according to result. • If restriction or clogging is found in fuel filter (high-pressure side), replace fuel pump unit. • If foreign material or clogging is found in fuel filter (low-pressure side), clean out fuel tank and filter. • If all items above are okay, replace 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 radiator cap. • Implement procedure to bleed air from engine coolant, then run 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 faulty parts, then go to next step.
12		No	Go to next step.
13	VERIFY TROUBLESHOOTING OF DTC P0133 COMPLETED • Make sure to reconnect all disconnected connectors. • Turn ignition switch to ON (Engine OFF). • Clear DTC from PCM memory using WDS or equivalent. • Run OBD DRIVE MODE. • Is PENDING CODE of same DTC present?	Yes	Replace PCM, then go to next step. (See PCM REMOVAL/INSTALLATION [L3].)
13		No	Go to next step.
14	VERIFY AFTER REPAIR PROCEDURE • Perform "After Repair Procedure". (See AFTER REPAIR PROCEDURE [L3].) • Is there DTC present?	Yes	Go to applicable DTC troubleshooting. (See DTC TABLE [L3].)
14		No	Troubleshooting completed.