DTC P0443 [AJ] (VIN: JMZ LW19J7*# 300001-, JM0 LW10J300 300001-301405, JM6 LW10J300 300001-, JM8 LW28J**# 300001-301513)

BME010200400205

DTC P0443

Evaporative emission control system purge control valve circuit malfunction

DETECTION CONDITION

• PCM monitors input voltages from purge solenoid valve. If voltage at PCM terminal 18 remains low or high, PCM determines that purge solenoid valve circuit has malfunction.
Diagnostic support note
• This is an continuous monitor (Other).
• MIL illuminates if PCM detects the above malfunction conditions in two consecutive drive cycles.
• FREEZE FRAME DATA is available.
• DTC is stored in the PCM memory.

POSSIBLE CAUSE

• Purge solenoid valve malfunction
• Connector or terminal malfunction
• Short to ground in wiring between purge solenoid valve terminal B and PCM terminal 18
• Open circuit in wiring between main relay terminal D and purge solenoid valve terminal A
• Open circuit in wiring between purge solenoid valve terminal B and PCM terminal 18
• Short to power circuit between purge solenoid valve terminal B and PCM terminal 18
• PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
VERIFY RELATED SERVICE INFORMATION AVAILABILITY
• Check for related Service Information availability.
• Is any related Service Information available?
Yes
Perform repair or diagnosis according to available Service Information.
• If vehicle is not repaired, go to the next step.
No
Go to the next step.
2
CLASSIFY INTERMITTENT CONCERN OR CONTINUOUS CONCERN
• Turn the ignition switch off then start engine.
• Is same DTC present?
Yes
Go to the next step.
No
Refer to intermittent concern.
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 the wiring harness for short to ground, then go to Step 10.
No
Replace the purge solenoid valve, then go to Step 10.
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
• Perform the purge solenoid valve inspection.
• Is the purge solenoid valve normal?
Yes
Go to the next step.
No
Replace the purge solenoid valve, then go to Step 10.
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 connector terminal A and body ground.
• Is the voltage B+?
Yes
Go to the next step.
No
Repair or replace the wiring harness for 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 B (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 for continuity between purge solenoid valve terminal B (wiring harness-side) and PCM terminal 18.
• If there is continuity, go to the next step.
• If there is no continuity, repair or replace harness for open, then go to the next step.
10
VERIFY TROUBLESHOOTING OF DTC P0443 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Turn the ignition switch off then start engine.
• Is the PENDING CODE of same DTC present?
Yes
Replace the PCM, then go to the next step.
No
Go to the next step.
11
VERIFY AFTER REPAIR PROCEDURE
• Perform "After Repair Procedure".
• Is there any DTC present?
Yes
Go to the applicable DTC inspection.
No
Troubleshooting completed.