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2008 - MX-5 - Engine

DTC P0443 [LF]



DTC P0443

Purge solenoid valve circuit problem

DETECTION CONDITION

  • The PCM monitors the purge solenoid valve control signal voltage and current. If the following conditions are met, the PCM determines that there is the purge solenoid valve control circuit problem.

    • The PCM turns the purge solenoid valve off, but the voltage of the purge solenoid valve control signal remains low.

    • The PCM turns the purge solenoid valve on, but the current of the purge solenoid valve control signal remains high.

    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 first drive cycle.

  • FREEZE FRAME DATA is available.

  • The DTC is stored in the PCM memory.

POSSIBLE CAUSE

  • Purge solenoid valve malfunction

  • Connector or terminal malfunction

  • Short to ground in wiring harness between purge solenoid valve terminal A and PCM terminal 2C

  • Open circuit in wiring harness between main relay and purge solenoid valve terminal B

  • Open circuit in wiring harness between purge solenoid valve terminal A and PCM terminal 2C

  • Short to power supply in wiring harness between purge solenoid valve terminal A and PCM terminal 2C

  • 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

CLASSIFY OPEN CIRCUIT OR SHORT TO GROUND MALFUNCTION
  • Disconnect purge solenoid valve tube that is connected to intake manifold.

  • Connect vacuum pump to purge solenoid valve.

  • Pump vacuum pump several times and stop.

  • Wait a few seconds.

  • Is vacuum maintained?

Yes

Go to Step 5.

No

Go to the next step.

4

INSPECT PASSAGE CONTROL OF PURGE SOLENOID VALVE
  • Turn the ignition switch off.

  • Disconnect purge solenoid valve connector.

  • Pump vacuum pump several times and wait a few seconds.

  • Is vacuum maintained?

Yes

Repair or replace wiring harness for short to ground, then go to Step 10.

No

Replace the purge solenoid valve, then go to Step 10.

(SeePURGE SOLENOID VALVE REMOVAL/INSTALLATION [LF].)

5

INSPECT PURGE SOLENOID VALVE CONNECTOR FOR POOR CONNECTION
  • Turn the ignition switch off.

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

  • Is there malfunction?

Yes

Repair or replace the terminal, then go to Step 10.

No

Go to the next step.

6

INSPECT PURGE SOLENOID VALVE

Yes

Go to the next step.

No

Replace the purge solenoid valve, then go to Step 10.

(SeePURGE SOLENOID VALVE REMOVAL/INSTALLATION [LF].)

7

INSPECT PURGE SOLENOID VALVE POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT
  • Turn the ignition switch to the ON position (Engine off).

  • Measure the voltage between purge solenoid valve terminal B and body ground.

  • Is the voltage B+?

Yes

Go to the next step.

No

Repair or replace the wiring harness for an open circuit, then go to Step 10.

8

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 malfunction?

Yes

Repair or replace the terminal, then go to Step 10.

No

Go to the next step.

9

INSPECT PURGE SOLENOID VALVE CONTROL CIRCUIT
  • Turn the ignition switch to the ON position (Engine off).

  • Measure the voltage between purge solenoid valve terminal A (wiring harness-side) and body ground.

  • Is the voltage B+?

Yes

Repair or replace the wiring harness for short to power supply, then go to the next step.

No

Inspect the harness at between purge solenoid valve terminal A (wiring harness-side) and PCM terminal 2C (wiring harness-side) for open or short circuit.

  • If there is continuity, go to the next step.

  • If there is no continuity, repair or replace the wiring harness for an open circuit, then go to the next step.

10

VERIFY TROUBLESHOOTING OF DTC P0443 COMPLETED
  • Make sure to reconnect all disconnected connectors.

  • Start the engine.

  • 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.

11

VERIFY AFTER REPAIR PROCEDURE

Yes

Go to the applicable DTC troubleshooting.

(See DTC TABLE [LF].)

No

Troubleshooting completed.




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