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2008 - MX-5 - Engine

DTC P2097 [LF]



DTC P2097

Target A/F feedback system too rich

DETECTION CONDITION

  • The PCM monitors the target A/F fuel trim when under the target A/F feedback control. If the fuel trim is less than specification, the PCM determines that the target A/F feedback system is too rich.

    Diagnostic support note
  • This is a continuous monitor. (Fuel system)

  • The MIL illuminates if the PCM detects the above malfunctioning 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 conditions during the first drive cycle.

  • FREEZE FRAME DATA is available.

  • The DTC is stored in the PCM memory.

POSSIBLE CAUSE

  • Leakage exhaust gas

  • Rear HO2S malfunction

  • IAT sensor malfunction

  • ECT sensor malfunction

  • Front HO2S malfunction

  • Excessive fuel line pressure

  • Fuel pump unit malfunction

  • Purge valve malfunction

  • Insufficient engine compression

  • 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 (Fuel system 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 to the ON position (Engine off).

  • Verify the related PENDING CODE or stored DTCs.

  • Is the DTC P2178 or P2188 also present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [LF].)

No

Go to the next step.

4

IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA
  • Is DTC P2097 on FREEZE FRAME DATA?

Yes

Go to the next step.

No

Go to FREEZE FRAME DATA DTC inspection.

(See DTC TABLE [LF].)

5

INSPECT REAR HO2S

Yes

Go to the next step.

No

Visually inspect for the exhaust gas leakage between TWC and rear HO2S.

Then go to Step 11.

6

VERIFY CURRENT INPUT SIGNAL STATUS
  • Connect the M-MDS to the DLC-2.

  • Verify the following PIDs:

    (See PCM INSPECTION [LF].)

    • 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 UNDER FREEZE FRAME DATA CONDITION
  • Connect the M-MDS to the DLC-2.

  • Verify the following PIDs under FREEZE FRAME DATA condition.

    (See PCM INSPECTION [LF].)

    • 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.

8

INSPECT FRONT HO2S

Yes

Go to the next step.

No

Visually inspect for exhaust gas leakage between the exhaust manifold and front HO2S.

Then go to Step 11.

9

INSPECT FUEL LINE PRESSURE

Yes

Replace the fuel pump unit, then go to Step 11.

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

No

Go to the next step.

10

INSPECT LONG TERM FUEL TRIM
  • Connect the M-MDS to the DLC-2.

  • Access LONGFT1 PID.

  • Compare the LONGFT1 PID with recorded FREEZE FRAME DATA at Step 1.

  • Is the LONGFT1 PID above FREEZE FRAME DATA?

Yes

Inspect the purge valve.

(See PURGE SOLENOID VALVE INSPECTION [LF].)

Then go to Step 11.

No

Go to the next step.

11

VERIFY TROUBLESHOOTING OF DTC P2097 COMPLETED
  • Make sure to reconnect all disconnected connectors.

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

  • Perform the PCM Adaptive Memory Produce 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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