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2008 - MX-5 - Engine

DTC P2196 [LF]



DTC P2196

Front HO2S signal stuck rich

DETECTION CONDITION

  • The PCM monitors the front HO2S output current when the following conditions are met. If the output current is less than 0.85 for 25 s, the PCM determines that the front HO2S signal remains rich.

    • 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: less than 0.7 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

  • Excessive fuel pressure

  • Restriction in intake air system

  • MAF sensor malfunction

  • ECT sensor malfunction

  • PCM malfunction


Diagnostic procedure

STEP

INSPECTION

ACTION

1

VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED
  • 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 REPAIR INFORMATION AVAILABILITY
  • 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

VERIFY RELATED PENDING CODE OR STORED DTC
  • Turn the ignition switch off, then ON position (Engine off).

  • Verify the related PENDING CODE or stored DTCs.

  • Is the DTC P2177 or P2187 also present?

Yes

Go to the appropriate DTC inspection.

(See DTC TABLE [LF].)

No

Go to the next step.

4

IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA
  • Is DTC P2196 on FREEZE FRAME DATA?

Yes

Go to the next step.

No

Go to FREEZE FRAME DATA DTC inspection.

(See DTC TABLE [LF].)

5

VERIFY CURRENT INPUT SIGNAL STATUS
  • 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 11.

6

VERIFY CURRENT INPUT SIGNAL STATUS UNDER FREEZE FRAME DATA CONDITION
  • Connect the M-MDS to the DLC-2.

  • Verify the following PIDs under the FREEZE FRAME DATA condition.

    • 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 11.

7

VERIFY CURRENT INPUT SIGNAL STATUS OF MAF SENSOR
  • 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 11.

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

8

INSPECT FRONT HO2S

Yes

Replace front HO2S, then go to Step 11.

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

No

Go to the next step.

9

INSPECT FUEL INJECTOR

Yes

Replace suspected fuel injector, then go to Step 11.

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

No

Go to the next step.

10

INSPECT FUEL LINE PRESSURE

Yes

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

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

No

Go to the next step.

11

VERIFY TROUBLESHOOTING OF DTC P2196 COMPLETED
  • 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.

12

VERIFY AFTER REPAIR PROCEDURE

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [LF].)

No

Troubleshooting completed.




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