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2008 - MX-5 - Engine

DTC P2096 [LF]



DTC P2096

Target A/F feedback system too lean

DETECTION CONDITION

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

    MONITORING CONDITION
  • Rear HO2S voltage is above 0.1 V

    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 condition 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

  • Air suction in intake air system

  • Front HO2S malfunction

  • MAF sensor malfunction

  • Insufficient fuel line pressure

  • Fuel pump unit malfunction

  • Leakage fuel

  • Improper operation ignition system

  • Insufficient engine compression

  • Fuel injector 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 (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 P2177 or P2187 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 P2096 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 the TWC and rear HO2S.

Then go to Step 17.

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 17.

7

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.

    (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 17.

8

INSPECT FRONT HO2S

Yes

Go to the next step.

No

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

Then go to Step 17.

9

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 17.

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

10

INSPECT INTAKE AIR SYSTEM FOR EXCESSIVE AIR SUCTION
  • Visually inspect the hose in intake air system for looseness, cracks or damages.

  • Is there any malfunction?

Yes

Repair or replace the malfunctioning part, then go to Step 17.

No

Go to the next step.

11

INSPECT FUEL LINE PRESSURE

Yes

Go to the next step.

No

Go to Step 13.

12

INSPECT FUEL SYSTEM FOR FUEL LEAKAGE
  • Visually inspect fuel leakage in the fuel system.

  • Is there fuel leakage?

Yes

Repair or replace the malfunctioning part, then go to Step 17.

No

Replace the fuel pump unit, then go to Step 17.

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

13

INSPECT IGNITION COIL WIRING HARNESSES
  • Inspect the ignition coil related wiring harness condition (intermittent open or short circuit) for all cylinders.

  • Are wiring harness conditions normal?

Yes

Go to the next step.

No

Repair the wiring harnesses, then go to Step 17.

14

INSPECT IGNITION SYSTEM OPERATION

Yes

Go to the next step.

No

Repair or replace the malfunctioning part according to spark test result.

Then go to Step 17.

15

INSPECT ENGINE COMPRESSION

Yes

Go to the next step.

No

Overhaul the engine, then go to Step 17.

16

INSPECT FUEL INJECTOR

Yes

Replace the fuel injector, then go to the next step.

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

No

Go to the next step.

17

VERIFY TROUBLESHOOTING OF DTC P2096 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.

18

VERIFY AFTER REPAIR PROCEDURE

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [LF].)

No

Troubleshooting completed.




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