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2008 - MX-5 - Engine

DTC P0101 [LF]



DTC P0101

MAF sensor circuit range/performance problem

DETECTION CONDITION

  • PCM monitors mass intake air flow amount when the engine is running.

    • If the mass intake air flow amount is above 37 l/s for 5 s and the engine speed is below 2,000 rpm with the engine running, the PCM determines that the detected mass intake air flow amount is too high.

    • If the mass intake air flow amount is below 4.4—59 l/s (The value depends on engine speed.) for 5 s and the engine speed is above 1,000 rpm with the engine running and the throttle opening angle above 50 %, the PCM determines that detected the mass intake air flow amount is too low.

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

  • 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

  • MAF sensor malfunction

  • Electrical corrosion in MAF RETURN circuit

  • Voltage drops in ground circuit


Diagnostic procedure

STEP

INSPECTION

ACTION

1

VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
  • Has FREEZE FRAME DATA been recorded?

Yes

Go to the next step.

No

Record the FREEZE FRAME 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 CURRENT INPUT SIGNAL STATUS IS CONCERN INTERMITTENT OR CONSTANT
  • Connect the M-MDS to DLC-2.

  • Start the engine.

  • Access ECT, MAF, TP and RPM PIDs using the M-MDS.

  • Warm-up engine until ECT PID is above –200 °C {–392 °F}.

  • Idle engine for 5 s or more.

    CAUTION:

    • While driving, always operate the vehicle in a safe and lawful manner.

  • Drive the vehicle under the following two conditions:

    • Condition 1
    • TP PID: 50—87.5 %

    • RPM PID: above 500 rpm

    • 4th gear (MT), D range (AT)

      Condition 2
    • TP PID: above 80 %

    • RPM PID: below 2,000 rpm

    • Gear in

  • Is PENDING CODE for this DTC present?

Yes

Go to the next step.

No

Intermittent concern exists. Go to the INTERMITTENT CONCERNS TROUBLESHOOTING procedure.

(See INTERMITTENT CONCERN TROUBLESHOOTING [LF])

4

CHECK MAF SENSOR TERMINALS FOR ELECTRICAL CORROSION
  • Turn the ignition switch to off.

  • Disconnect MAF sensor connector.

  • Check for poor connection (damaged, pulled-out terminals, corrosion, etc.).

  • Is any problem corrosion found?

Yes

Repair or replace the suspected terminal or MAF sensor, then go to Step 6.

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

No

Go to the next step.

5

INSPECT PCM CONNECTOR FOR POOR CONNECTION
  • Disconnect the PCM connector.

  • Inspect for poor connection (such as damaged/ pulled-out pins, corrosion.).

  • Is there any malfunction?

Yes

Repair terminal, then go to the next step.

No

Go to the next step.

6

VERIFY TROUBLESHOOTING OF DTC P0101 COMPLETED
  • Make sure to connect all disconnected connectors.

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

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

  • Start the engine.

  • Warm-up engine until ECT PID is above –200 °C {–392 °F}.

  • Idle engine for 5 s or more.

    CAUTION:

    • While performing the Drive Mode, always operate the vehicle in a safe and lawful manner.

  • Drive the vehicle under the following two conditions:

    • Condition 1
    • TP PID: 50—87.5 %

    • RPM PID: above 500 rpm

    • 4th gear (MT), D range (AT)

      Condition 2
    • TP PID: above 80 %

    • RPM PID: below 2,000 rpm

    • Gear in

  • Is PENDING CODE for this the DTC present?

Yes

Replace the PCM, then go to the next step.

(See PCM REMOVAL/INSTALLATION [LF].)

No

Go to the next step.

7

VERIFY AFTER REPAIR PROCEDURE

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [LF].)

No

Troubleshooting completed.




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