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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
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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
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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. (See INTERMITTENT CONCERN TROUBLESHOOTING [AJ].)
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. (See PURGE SOLENOID VALVE INSPECTION [AJ] (VIN: JMZ LW19J7*# 300001-, JM0 LW10J300 300001-301405, JM6 LW10J300 300001-, JM8 LW28J**# 300001-301513).) • 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". (See AFTER REPAIR PROCEDURE [AJ].) • Is there any DTC present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [AJ] (VIN: JMZ LW19J7*# 300001-, JM0 LW10J300 300001-301405, JM6 LW10J300 300001-, JM8 LW28J**# 300001-301513).)
No | Troubleshooting completed.