DTC P2195

Front HO2S signal stuck lean

DETECTION CONDITION

• The PCM monitors the front HO2S output when the following conditions are met. If the output is more than 1.15 for 25 s, the PCM determines that the front HO2S signal remains lean.

MONITORING CONDITION

• ECT: more than 70 °C {158 °F}

• Engine speed: 1,000—3,200 rpm

• MAF amount: 6—80 g/s {0.80—10.58 lb/min}

• Target A/F feedback system status: feedback control

• Output voltage from the middle HO2S: more than 0.2 V

Diagnostic support note

• This is an intermittent monitor (HO2S).

• The MIL illuminates if the 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 the PCM detects the above malfunction condition during the first drive cycle.

• FREEZE FRAME DATA is available.

• The DTC is stored in the PCM memory.

POSSIBLE CAUSE

• Front HO2S malfunction

• Fuel injector malfunction

• Insufficient fuel line pressure

• Leakage exhaust gas

• Air suction at intake air system malfunction

• Leakage fuel

• MAF sensor malfunction

• ECT sensor malfunction

• PCM malfunction

STEP

INSPECTION

ACTION

1

• Have FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS (HO2S related) been recorded?

Yes

Go to the next step.

No

Record the FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS on the repair order, then go to the next step.

2

• Verify related Service Bulletins and/or on-line repair information availability.

• Is any related repair information available?

Yes

Perform repair or diagnosis according to the available repair information.

• If the vehicle is not repaired, go to the next step.

No

Go to the next step.

3

• Turn the ignition switch off, then to ON position (Engine off).

• Verify the related PENDING CODE or stored DTCs.

• Is the DTC P2177 or P2187 also present?

Yes

Go to applicable DTC inspection.

(See DTC TABLE [LF].)

No

Go to the next step.

4

• Is DTC P2195 on FREEZE FRAME DATA?

Yes

Go to the next step.

No

Go to FREEZE FRAME DATA DTC inspection.

(See DTC TABLE [LF].)

5

• Connect the M-MDS to the DLC-2.

• Verify the following PIDs.

  (See PCM INSPECTION [LF].)

• APP1

• APP2

• ECT

• MAF

• TP

• VSS

• Are the PIDs normal?

Yes

Go to the next step.

No

Inspect the malfunctioning part according to the inspection results.

Then go to Step 14.

6

• Connect the M-MDS to the DLC-2.

• Verify the following PIDs under FREEZE FRAME DATA condition.

  (See PCM INSPECTION [LF].)

• APP1

• APP2

• ECT

• MAF

• TP

• VSS

• Are the PIDs normal?

Yes

Go to the next step.

No

Inspect the malfunctioning part according to the inspection results.

Then go to Step 14.

7

• Visually inspect for loosen, cracks or damages hose in intake air system.

• Is there any malfunction?

Yes

Repair or replace the malfunctioning part, then go to Step 14.

No

Go to the next step.

8

• Connect the M-MDS to the DLC-2.

• Start the engine.

• Access the MAF PID.

• Verify that the MAF PID changes quickly according to engine speed.

• Is the PID normal?

Yes

Go to the next step.

No

Replace the MAF/IAT sensor, then go to Step 14.

(SeeMASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REMOVAL/INSTALLATION [LF].)

9

• Inspect front HO2S.

  (See FRONT HEATED OXYGEN SENSOR (HO2S) INSPECTION [LF].)

• Is there any malfunction?

Yes

Replace front HO2S, then go to Step 14.

(See FRONT HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION [LF].)

No

Go to the next step.

10

• Inspect fuel injector.

  (See FUEL INJECTOR INSPECTION [LF].)

• Is there any malfunction?

Yes

Replace suspected fuel injector, then go to Step 14.

(See FUEL INJECTOR REMOVAL/INSTALLATION [LF].)

No

Go to the next step.

11

• Perform the “FUEL LINE PRESSURE INSPECTION”.

  (See FUEL LINE PRESSURE INSPECTION [LF].)

• Is there any malfunction?

Yes

Go to the next step.

No

Go to Step 13.

12

• Visually inspect fuel leakage in the fuel system.

• Is there fuel leakage?

Yes

Repair or replace the malfunctioning part, then go to the next step.

No

Replace the fuel pump unit, then go to the next step.

(See FUEL PUMP UNIT REMOVAL/INSTALLATION [LF].)

13

• Make sure to reconnect all disconnected connectors.

• Clear the DTC from the PCM memory using the M-MDS.

• Perform the PCM Adopted Memory Produce Drive Mode and HO2S heater, and TWC Repair Verification Drive Mode.

  (See OBD-II DRIVE MODE [LF].)

• Is the PENDING CODE for this DTC present?

Yes

Replace the PCM, then go to the next step.

(See PCM REMOVAL/INSTALLATION [LF].)

No

Go to the next step.

14

• Perform “AFTER REPAIR PROCEDURE”.

  (See AFTER REPAIR PROCEDURE [LF].)

• Is any DTC present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [LF].)

No

Troubleshooting completed.