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 DTC P0443 [L8, LF, L3]

DTC P0443 [L8, LF, L3]

id0102a1807600

DTC P0443

Purge solenoid valve circuit problem

DETECTION CONDITION

• The PCM monitors the input voltages from the purge solenoid valve. If the voltage remains low or high, the PCM determines that the purge solenoid valve circuit has a 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.
• FREEZE FRAME DATA is available.
• Are any DTCs 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 AND DIAGNOSTIC MONITORING TEST RESULTS HAS BEEN RECORDED
• Has FREEZE FRAME DATA been recorded?
Yes
Go to the next step.
No
Record the FREEZE FRAME on the repair order, then go to the next step.
2
VERIFY RELATED REPAIR INFORMATION AVAILABILITY
• Verify related Service Information availability.
• Is any related Service Information available?
Yes
Perform repair or diagnosis according to the available Service 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.
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 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 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.
No
Go to the next step.
11
VERIFY AFTER REPAIR PROCEDURE
• Perform the "AFTER REPAIR PROCEDURE".
• Are any DTC present?
Yes
Go to the applicable DTC troubleshooting.
No
Troubleshooting completed.