DTC P0443 [L3]

BME010200400W03

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 4U remains low or high, PCM determines that purge solenoid valve circuit has malfunction.
Diagnostic support note
• This is a continuous monitor (CCM).
• MIL illuminates if 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 PCM detects the above malfunction condition.
• 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 4U
• Open circuit in wiring between main relay and purge solenoid valve terminal A
• Open circuit in wiring between purge solenoid valve terminal B and PCM terminal 4U
• Short to power circuit between purge solenoid valve terminal B and PCM terminal 4U
• PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
PERFORM DTC CONFIRMATION PROCEDURE
• Perform DTC CONFIRMATION PROCEDURE.
• Is same DTC present?
Yes
Go to next step.
No
Intermittent concern exists. Go to INTERMITTENT CONCERN TROUBLESHOOTING procedure.
2
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 4.
No
Go to next step.
3
INSPECT PASSAGE CONTROL OF PURGE SOLENOID VALVE
• Turn ignition key to OFF.
• Disconnect purge solenoid valve connector.
• Pump vacuum pump several times and wait a few seconds.
• Is vacuum maintained?
Yes
Repair or replace harness for short to ground, then go to Step 9.
No
Replace purge solenoid valve, then go to Step 9.
4
INSPECT PURGE SOLENOID VALVE CONNECTOR FOR POOR CONNECTION
• Turn ignition key to OFF.
• Inspect for poor connection (damaged/pulled-out pins, corrosion, etc.).
• Is there malfunction?
Yes
Repair or replace terminal, then go to Step 9.
No
Go to next step.
5
INSPECT PURGE SOLENOID VALVE
• Perform purge solenoid valve inspection.
• Is purge solenoid valve okay?
Yes
Go to next step.
No
Replace purge solenoid valve, then go to Step 9.
6
INSPECT PURGE SOLENOID VALVE POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT
• Turn ignition key to ON (Engine OFF).
• Measure voltage between purge solenoid valve connector terminal A and body ground.
• Is voltage B+?
Yes
Go to next step.
No
Repair or replace harness for open, then go to Step 9.
7
INSPECT PCM CONNECTOR FOR POOR CONNECTION
• Turn ignition key to OFF.
• Disconnect PCM connector.
• Inspect for poor connection (damaged/pulled-out pins, corrosion, etc.).
• Is there any malfunction?
Yes
Repair or replace terminal, then go to Step 9.
No
Go to next step.
8
INSPECT PURGE SOLENOID VALVE CONTROL CIRCUIT
• Turn ignition key to ON (Engine OFF).
• Measure voltage between purge solenoid valve terminal B (harness-side) and body ground.
• Is voltage B+?
Yes
Repair or replace harness for short to power, then go to next step.
No
Inspect for continuity between purge solenoid valve terminal B (harness-side) and PCM terminal 4U (harness-side).
• If there is continuity, go to next step.
• If there is no continuity, repair or replace harness for open, then go to next step.
9
VERIFY TROUBLESHOOTING OF DTC P0443 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Perform KOEO/KOER self-test.
• Is same DTC present?
Yes
Replace PCM, then go to next step.
No
Go to next step.
10
VERIFY AFTER REPAIR PROCEDURE
• Perform "After Repair Procedure".
• Is there any DTC present?
Yes
Go to applicable DTC troubleshooting.
No
Troubleshooting completed.