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2008 - MX-5 - Engine

DTC P2401 [LF]



DTC P2401

EVAP system leak detection pump motor circuit low

DETECTION CONDITION

  • The PCM monitors pump load current (EVAP line pressure), while evaporative leak monitor is operating. If the pump load current is lower than specified, the PCM determines EVAP system leak detection pump motor circuit has a malfunction.

    Diagnostic support note
  • This is a intermittent 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

  • EVAP system leak detection pump malfunction

  • Open circuit between the main relay and EVAP system leak detection pump terminal A

  • Open circuit between the EVAP system leak detection pump terminal D and PCM terminal 1U

  • Short to ground circuit between the EVAP system leak detection pump terminal D and PCM terminal 1U

  • Poor connection at EVAP system leak detection pump or PCM connector

  • PCM malfunction


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 DATA 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 related PENDING CODE or stored DTC.

  • Is DTC P2405 present?

Yes

Go to the applicable DTC inspection.

(See DTC P2405 [LF].)

No

Go to the next step.

4

INSPECT EVAP SYSTEM LEAK DETECTION PUMP CONNECTOR FOR POOR CONNECTION
  • Turn the ignition switch off.

  • Disconnect EVAP system leak detection pump connector.

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

  • Is there any malfunction?

Yes

Repair or replace the terminal, then go to Step 11.

No

Go to the next step.

5

INSPECT EVAP SYSTEM LEAK DETECTION PUMP MOTOR GROUND CIRCUIT FOR OPEN CIRCUIT
  • Inspect for continuity between EVAP system leak detection pimp terminal B (wiring harness-side) and body ground.

  • Is there continuity?

Yes

Go to the next step.

No

Repair or replace wiring harness for open circuit, then go to Step 11.

6

INSPECT PCM CONNECTOR FOR POOR CONNECTION
  • Turn the ignition switch off.

  • Disconnect the PCM connector.

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

  • Is there any malfunction?

Yes

Repair the terminal, then go to Step 10.

No

Go to the next step.

7

INSPECT EVAP SYSTEM LEAK DETECTION PUMP MOTOR CIRCUIT FOR SHORT TO GROUND
  • Inspect for continuity between EVAP system leak detection pump terminal D (wiring harness-side) and body ground.

  • Is there continuity?

Yes

Repair or replace the wiring harness for short to ground, then go to Step 11.

No

Go to the next step.

8

INSPECT EVAP SYSTEM LEAK DETECTION PUMP MOTOR CIRCUIT FOR OPEN CIRCUIT
  • Inspect for continuity between EVAP system leak detection pump terminal D (wiring harness-side) and PCM terminal 1U (wiring harness-side).

  • Is there continuity?

Yes

Go to the next step.

No

Repair or replace wiring harness for open circuit, then go to Step 11.

9

INSPECT EVAP SYSTEM LEAK DETECTION PUMP POWER CIRCUIT FOR OPEN CIRCUIT
  • Inspect for continuity between EVAP system leak detection pump terminal A (wiring harness-side) and main relay.

  • Is there continuity?

Yes

Go to the next step.

No

Repair or replace wiring harness for open circuit, then go to Step 11.

10

INSPECT EVAP SYSTEM LEAK DETECTION PUMP

Yes

Go to the next step.

No

Replace the EVAP system leak detection pump, then go to the next step. (SeeEVAPORATIVE EMISSION (EVAP) SYSTEM LEAK DETECTION PUMP REMOVAL/INSTALLATION [LF].)

11

VERIFY TROUBLESHOOTING OF DTC P2401 COMPLETED
  • Make sure to reconnect all disconnected connectors.

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

  • Perform the evaporative emission test using the M-MDS.

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

  • Is the same DTC present?

    NOTE:

    • If evaporative system test function is not available, perform the following procedure:

    • Is the PENDING CODE the same as the DTC present?

Yes

Replace the PCM, then go to the next step.

(SeePCM 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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