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2008 - MX-5 - Engine

DTC P0441 [LF]



DTC P0441

Evaporative emission control system incorrect purge flow

DETECTION CONDITION

  • PCM measures the purge line pressure, which is the vacuum when a following condition. If vacuum between charcoal canister and intake manifold does not reach the specified, PCM determines that the EVAP system has clogging.

    • MONITORING CONDITION
    • Engine speed: 1,500—3,500 rpm

    • Throttle opening angle: 11—20 %

    • Vehicle speed: 69.5—136 km/h {43.2—84.5 mph} [MT]/34.5—136 km/h {21.4—84.5 mph} [AT]

    Diagnostic support note
  • This is an intermittent monitor (Evaporative system).

  • The MIL illuminates if the PCM detects 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.

  • DIAGNOSTIC MONITORING TEST RESULT is available.

POSSIBLE CAUSE

  • Purge solenoid valve malfunction

  • Blockage in EVAP system

  • Charcoal canister malfunction

  • Catch tank malfunction

  • EVAP hose damaged or loose

  • EVAP pipe damaged

  • Evaporative emission system leak detection pump malfunction

  • Fuel pump unit poor seal

  • Leakage in EVAP system

  • PCM malfunction


Diagnostic procedure

STEP

INSPECTION

ACTION

1

VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED
  • Have the FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS (Evaporative system related) been recorded?

Yes

Go to the next step.

No

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

2

VERIFY RELATED SERVICE BULLETINS AVAILABILITY
  • Verify related Service Bulletins availability.

  • Is any related Service Bulletins available?

Yes

Perform the repair or diagnosis according to the available Service Bulletins.

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

No

Go to the next step.

3

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

  • Verify related pending code or stored DTCs.

  • Is DTC P0443 present?

Yes

Go to the appropriate DTC inspection.

No

Go to the next step.

4

DETERMINE IF THERE IS BLOCKAGE
  • Clear the DTC using the M-MDS.

  • Then perform the KOER self-test.

  • Is DTC P0441 present?

Yes

Go to Step 6.

No

Go to the next step.

5

INSPECT IF MALFUNCTION IS BLOCKAGE OR LEAKAGE IN PURGE SOLENOID VALVE

NOTE:

  • Carefully handle the evaporative system when disconnecting and connecting hoses. Do not use any lubricant around the system. Foreign material can cause a system malfunction.

  • Remove the purge solenoid valve and cool it down in a refrigerator for 1 hour.

  • Install the purge solenoid valve and perform the KOER self-test using the M-MDS.

  • Is DTC P0441 present?

Yes

Replace the purge solenoid valve. Then go to Step 12.

No

Go to Step 7.

6

INSPECT FOR LOCATION OF BLOCKAGE
  • Apply vacuum to the following parts using a vacuum pump.

  • Verify that the system does not hold vacuum at the following locations:

    • Hoses and pipes between intake manifold and charcoal canister

    • Catch tank

    • Charcoal canister

  • Is there any blockage?

Yes

Repair or replace the appropriate parts.

Then go to Step 12.

No

Replace the purge solenoid valve. Then go to Step 12.

7

DETERMINE LEAKAGE EXISTENCE
  • Perform the evaporative system leak inspection.

  • Is DTC P0442 recorded?

Yes

Go to the next step.

No

Go to Step 12.

8

INSPECT IF PURGE SOLENOID VALVE IS STUCK OPEN

Yes

Go to the next step.

No

Replace the purge solenoid valve. Then go to Step 12.

9

INSPECT FOR LOCATION OF LEAKAGE
  • Inspect the following for leakage using the evaporative leak detector.

    • Between purge solenoid valve and check valve

    • Between check valve and charcoal canister

  • Is there any leakage?

Yes

Repair or replace the appropriate parts.

Then go to Step 12.

No

Go to the next step.

10

INSPECT EVAP SYSTEM LEAK DETECTION PUMP

NOTE:

  • Be careful to not apply a shock to the evaporative system leak detection pump, otherwise the results of the leak inspection could be incorrect.

  • Connect all disconnected connectors and hoses.

  • Place a clamp on the evaporative system leak detection pump hose between the evaporative system leak detection pump and the air filter.

  • Perform the evaporative system leak inspection.

    (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [LF].)

  • Is DTC P2404 recorded?

Yes

Go to the next step.

No

Replace the evaporative system leak detection pump, then go to Step 13.

11

INSPECT FUEL PUMP UNIT INSTALLATION
  • Remove the fuel tank.

  • Visually inspect for damage, insufficient sealing or a poorly installed pump unit.

  • Is it normal?

Yes

Go to the next step.

No

Repair or replace the fuel tank or sealing, then go to the next step.

12

PERFORM KOER SELF-TEST TO DETERMINE OTHER RELATED MALFUNCTION OTHER THAN BLOCKAGE LOCATION

NOTE:

  • Carefully handle the evaporative system when disconnecting and connecting hoses. Do not use any lubricant around the system. Foreign material can cause a system malfunction.

  • Connect all disconnected connectors and hoses.

  • Perform the KOER self-test using M-MDS.

  • Is DTC P0441 still recorded?

Yes

Blockage still exists.

Locate blockage position and repair.

Then go to the next step.

No

Go to the next step.

13

PERFORM LEAK INSPECTION

Yes

Leakage still exists. Locate leak the point and repair.

Then go to the next step.

No

Go to the next step.

14

VERIFY TROUBLESHOOTING OF DTC P0441 COMPLETED
  • Start the engine and let it idle.

  • Clear the DTC using the M-MDS.

  • Turn the ignition switch off.

  • Perform the “EVAP System 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.

No

Go to the next step.

15

VERIFY AFTER REPAIR PROCEDURE

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [LF].)

No

Troubleshooting completed.




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