DTC P0131, P0132 [L3]


DTC P0131 DTC P0132	Front HO2S stuck low Front HO2S stuck high
DETECTION CONDITION	• PCM monitors input voltage from front HO2S when the following monitoring conditions are met. If input voltage from sensor remains below or above 0.45 V for 56 s, PCM determines that there is no front HO2S inversion. MONITORING CONDITIONS - Engine speed is above 1,500 rpm. - Engine coolant temperature is above 80 °C {176°F}. Diagnostic support note • This is a continuous monitor (CCM). • 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. • 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 malfunction • Front HO2S heater malfunction • Fuel injector malfunction • Pressure regulator malfunction • Fuel pump malfunction • Fuel delivery hose clogging or leakage • Fuel filter clogging • Fuel return hose clogging or leakage • Air suction or leakage • PCV valve malfunction • Purge solenoid valve malfunction • Purge solenoid hoses are hooked up incorrectly. • Ignition coil malfunction • 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 stored DTCs using WDS or equivalent. • Is any other DTC present?	Yes	Go to appropriate DTC troubleshooting procedures.
3		No	Go to next step.
4	IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA • Is DTC P0131 and P0132 on FREEZE FRAME DATA?	Yes	Go to next step.
4		No	Go to troubleshooting procedures for DTC on FREEZE FRAME DATA.
5	VERIFY CURRENT INPUT SIGNAL STATUS - IS CONCERN INTERMITTENT OR CONSTANT • Warm-up engine. • Access O2S11 for P0131 and P0132 PID using WDS or equivalent. • Verify PID while racing engine (in PARK). • Is PID reading okay? - More than 0.45 V when accelerator pedal is suddenly depressed (rich condition) - Less than 0.45 V just after release of accelerator pedal (lean condition)	Yes	Go to next step.
5		No	Replace front HO2S, then go to Step 19.
6	INSPECT LONG TERM FUEL TRIM • Access LONGFT1 for P0131 and P0132 PID using WDS or equivalent. • Compare it with FREEZE FRAME DATA recorded at Step1. • Did it decrease?	Yes	Engine is operating under rich condition. Go to next step.
6		No	Engine is operating under lean condition. Go to step 9.
7	INSPECT FUEL LINE PRESSURE (EXCESSIVE FUEL LINE PRESSURE) • Turn ignition key to OFF. • Inspect fuel line pressure. (See FUEL LINE PRESSURE INSPECTION [L3].) • Is fuel line pressure okay?	Yes	Go to next step.
7		No	Inspect following parts and repair or replace if necessary: • Fuel pump maximum pressure • Fuel return pipe for clog - If all items above are okay, replace pressure regulator. Then, go to Step 19.
8	INSPECT PURGE SOLENOID VALVE FOR STUCK OPEN • Turn ignition key to OFF. • Disconnect both hoses from purge solenoid valve. • Blow air through purge solenoid valve. • Does air blow through?	Yes	Replace purge solenoid valve.
8		No	Go to Step 13.
9	INSPECT PCV VALVE OPERATION • Inspect PCV valve operation. (See PCV VALVE INSPECTION [L3].) • Is PCV valve okay?	Yes	Go to next step.
9		No	Replace PCV, then go to Step 19.
10	INSPECT FUEL LINE PRESSURE (LOW FUEL LINE PRESSURE) • Turn ignition key to OFF. • Inspect fuel line pressure. (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 PUMP MAXIMUM PRESSURE • Stop engine. • Turn ignition key to ON (Engine OFF). • Perform fuel pump maximum pressure test. (See FUEL LINE PRESSURE INSPECTION [L3].) • Is fuel pump maximum pressure okay?	Yes	Go to next step.
11		No	Inspect fuel pump circuit for open or poor connection. • Repair or replace suspected circuit. • If circuit is okay, replace fuel pump. Then go to Step 19.
12	INSPECT FUEL LINE FROM FUEL PUMP TO FUEL DELIVERY PUMP • Visually inspect fuel line for any leakage. • Is any fuel leakage found?	Yes	Replace suspected fuel line, then go to Step 19.
12		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) - If restriction or clogging is found in fuel filter (high-pressure side), replace fuel filter. - If foreign materials or clogging is found inside fuel filter (low-pressure side), clean out fuel tank and filter. - If all items above are okay, replace pressure regulator. Then, go to Step 19.
13	CHECK IGNITION COIL OPERATION • Perform spark test. (See Spark Test) • Do all cylinders show blinking condition?	Yes	Go to step 16.
13		No	Go to next step.
14	INSPECT POWER SUPPLY TERMINAL AT IGNITION COIL CONNECTOR • Disconnect ignition coil connector. • Turn ignition key to ON (Engine OFF). • Measure voltage between ignition coil connector terminal D (harness-side) and body ground. • Is voltage reading B+?	Yes	Go to next step.
14		No	Check for open circuit between ignition coil connector and ignition switch. Repair or replace wiring harness, then go to Step 19.
15	INSPECT IGNITION COIL RESISTANCE • Inspect ignition coil resistance. (See IGNITION COIL INSPECTION [L3].) • Is coil resistance okay?	Yes	Go to next step.
15		No	Replace ignition coil, then go to Step 19.
16	INSPECT ENGINE COMPRESSION • Inspect engine compression. (See COMPRESSION INSPECTION [L3].) • Is compression okay?	Yes	Go to next step.
16		No	Implement engine overhaul for repairs, then go to next step.
17	INSPECT FUEL INJECTOR OPERATION • Turn ignition key to OFF. • Inspect injector. (See FUEL INJECTOR INSPECTION [L3].) • Is injector okay?	Yes	Go to next step.
17		No	Replace injector, then go to Step 19.
18	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.
18		No	Go to next step.
19	VERIFY TROUBLESHOOTING OF DTC P0131 or P0132 COMPLETED • Make sure to reconnect all disconnected connectors. • Turn ignition key to ON (Engine OFF). • Clear DTC from memory using WDS or equivalent. • Start engine. • Access ECT and RPM PIDs using WDS or equivalent. • Make sure that ECT PID is above 80 °C {176 °F}. • Increase and keep engine speed above 1,500 rpm for at least 1 min. • Is PENDING CODE of same DTC present?	Yes	Replace PCM, then go to next step. (See PCM REMOVAL/INSTALLATION [L3].)
19		No	Go to next step.
20	VERIFY AFTER REPAIR PROCEDURE • Perform "After Repair Procedure". (See AFTER REPAIR PROCEDURE [L3].) • Is there any DTC present?	Yes	Go to applicable DTC troubleshooting. (See DTC TABLE [L3].)
20		No	Troubleshooting completed.