DTC P0443 [AJ] (VIN: JM0 LW10J300 301406-, JMZ LW69J7*# 307683-, JM8 LW28J**# 301514-, JM8 LW28A**# 301514- (Assumed))

BME010200400W07

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 85 remains low or high, PCM determines that purge solenoid valve circuit has malfunction.
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 the first drive cycle.
• 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 85
• 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 85
• Short to power circuit between purge solenoid valve terminal B and PCM terminal 85
• PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
VERIFY RELATED REPAIR INFORMATION AVAILABILITY
• Check for related Service 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.
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 harness for short to ground, then go to Step 10.
No
Replace purge solenoid valve, then go to Step 10.
5
INSPECT PURGE SOLENOID VALVE CONNECTOR FOR POOR CONNECTION
• Turn the ignition switch off.
• Check for poor connection (damaged/pulled-out pins, corrosion, etc.).
• 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
• Inspect the purge solenoid valve.
• Is the purge solenoid valve normal?
Yes
Go to the next step.
No
Replace 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 voltage between purge solenoid valve connector terminal A and body ground.
• Is voltage B+?
Yes
Go to the next step.
No
Repair or replace harness for open, then go to Step 10.
8
INSPECT PCM CONNECTOR FOR POOR CONNECTION
• Turn the ignition switch off.
• Disconnect PCM connector.
• Check for poor connection (damaged/pulled-out pins, corrosion, etc.).
• 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
• Connect the PCM connector.
• Turn the ignition switch to the ON position (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 the next step.
No
Check for continuity between purge solenoid valve terminal B (harness-side) and PCM terminal 85.
• 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 key to OFF then start engine.
• Is same DTC present?
Yes
Replace PCM, then go to the next step.
No
Go to the next step.
11
VERIFY AFTER REPAIR PROCEDURE
• Perform the "After Repair Procedure".
• Are any DTCs present?
Yes
Go to the applicable DTC inspection.
No
Troubleshooting completed.