DTC P0131, P0132 [L3]


DTC P0131 DTC P0132	Front HO2S stuck low Front HO2S stuck high
DETECTION CONDITION	• THe PCM monitors input voltage from the front HO2S when the following monitoring conditions are met. If input voltage from sensor remains below or above 0.45 V for 56 s, the 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 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 ON (Engine off). • Verify pending and stored DTCs using the WDS or equivalent. • Is any other DTC present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [L3].)
3		No	Go to the next step.
4	IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA • Is DTC P0131 and P0132 on FREEZE FRAME DATA?	Yes	Go to the 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 the engine. • Access O2S11 for P0131 and P0132 PID using WDS or equivalent. • Verify PID while racing engine (in PARK). • Is PID reading normal? - More than 0.45 V when the accelerator pedal is suddenly depressed (rich condition) - Less than 0.45 V just after release of the accelerator pedal (lean condition)	Yes	Go to the next step.
5		No	Replace the 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	The engine is operating under rich condition. Go to the next step.
6		No	The engine is operating under lean condition. Go to step 9.
7	INSPECT FUEL LINE PRESSURE (EXCESSIVE FUEL LINE PRESSURE) • Turn the ignition switch off. • Inspect fuel line pressure. (See FUEL LINE PRESSURE INSPECTION [L3].) • Is fuel line pressure normal?	Yes	Go to the next step.
7		No	Inspect the following parts and repair or replace if necessary: • Fuel pump maximum pressure • Fuel return pipe for clog - If all items above are normal, replace the pressure regulator. Then, go to Step 19.
8	INSPECT PURGE SOLENOID VALVE FOR STUCK OPEN • Turn the ignition switch off. • Disconnect both hoses from purge solenoid valve. • Blow air through purge solenoid valve. • Does air blow through?	Yes	Replace the purge solenoid valve.
8		No	Go to Step 13.
9	INSPECT PCV VALVE OPERATION • Inspect the PCV valve operation. (See PCV VALVE INSPECTION [L3].) • Is the PCV valve normal?	Yes	Go to the next step.
9		No	Replace the PCV, then go to Step 19.
10	INSPECT FUEL LINE PRESSURE (LOW FUEL LINE PRESSURE) • Turn the ignition switch off. • Inspect fuel line pressure. (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 PUMP MAXIMUM PRESSURE • Stop the engine. • Turn the ignition switch to the ON position (Engine off). • Perform fuel pump maximum pressure test. (See FUEL LINE PRESSURE INSPECTION [L3].) • Is fuel pump maximum pressure normal?	Yes	Go to the next step.
11		No	Inspect fuel pump circuit for open circuit or poor connection. • Repair or replace the circuit. • If circuit is normal, replace the fuel pump. Then go to Step 19.
12	INSPECT FUEL LINE FROM FUEL PUMP TO FUEL DELIVERY PUMP • Visually inspect the fuel line for any leakage. • Is any fuel leakage found?	Yes	Replace suspected fuel line, then go to Step 19.
12		No	Inspect the fuel filters for the 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 the fuel filter. - If foreign materials or clogging is found inside the fuel filter (low-pressure side), clean out the fuel tank and filter. - If all items above are normal, replace the 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 the next step.
14	INSPECT POWER SUPPLY TERMINAL AT IGNITION COIL CONNECTOR • Disconnect ignition coil connector. • Turn the ignition switch to the ON position (Engine off). • Measure the voltage between ignition coil connector terminal D (wiring harness-side) and body ground. • Is the voltage reading B+?	Yes	Go to the next step.
14		No	Check for open circuit between ignition coil connector and ignition switch. Repair or replace the wiring harness, then go to Step 19.
15	INSPECT IGNITION COIL RESISTANCE • Inspect the ignition coil resistance. (See IGNITION COIL INSPECTION [L3].) • Is the coil resistance normal?	Yes	Go to the next step.
15		No	Replace the ignition coil, then go to Step 19.
16	INSPECT ENGINE COMPRESSION • Inspect the engine compression. (See COMPRESSION INSPECTION [L3].) • Is the compression normal?	Yes	Go to the next step.
16		No	Implement the engine overhaul for repairs, then go to the next step.
17	INSPECT FUEL INJECTOR OPERATION • Turn the ignition switch off. • Inspect the fuel injector. (See FUEL INJECTOR INSPECTION [L3].) • Is the fuel injector normal?	Yes	Go to the next step.
17		No	Replace the fuel 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 the 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 the malfunctioning parts, then go to the next step.
18		No	Go to the next step.
19	VERIFY TROUBLESHOOTING OF DTC P0131 or P0132 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. • Start the 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 the PENDING CODE of same DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [L3].)
19		No	Go to the next step.
20	VERIFY AFTER REPAIR PROCEDURE • Perform "After Repair Procedure". (See AFTER REPAIR PROCEDURE [L3].) • Is there any DTC present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [L3].)
20		No	Troubleshooting completed.