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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 333 (On-Board Diagnostic (Engine Control System (L3)) >> DTC P0443 >> Diagnostic procedure

Diagnostic procedure

WARNING: This page is about a different car, the 2005 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
DTC P0443 [L3] DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1 VERIFY FREEZE FRAME DATA HAS BEEN RECORDED 
  • Has FREEZE FRAME DATA been recorded?
 Yes Go to the next step.
No Record FREEZE FRAME DATA on repair order, then go to the next step.
2 VERIFY RELATED REPAIR INFORMATION AVAILABILITY 
  • Check for related Service Bulletins and/or online repair 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.
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.
  • Inspect for poor connection (damaged/pulled-out pins, corrosion, etc.).
  • Is there any malfunction?
 Yes Repair or replace the terminal, then go to Step 10.
No Go to the next step.
6 INSPECT PURGE SOLENOID VALVE 
 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 ignition switch to ON (Engine off).
  • Measure voltage between purge solenoid valve connector terminal B and body ground.
  • Is voltage B+  ?
 Yes Go to the next step.
No Repair or replace harness for open circuit, then go to Step 10.
8 INSPECT PCM CONNECTOR FOR POOR CONNECTION 
  • Turn the ignition switch off.
  • Disconnect PCM connector.
  • Inspect for poor connection (damaged/pulled-out pins, corrosion, etc.).
  • Is there any 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 ignition switch to ON (Engine off).
  • Measure voltage between purge solenoid valve terminal A (harness-side) and body ground.
  • Is voltage B+  ?
 Yes Repair or replace harness for short to power supply, then go to the next step.
No Inspect for continuity between purge solenoid valve terminal A (harness-side) and PCM terminal 85(1), 4U(2) (harness-side).
  • 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.
  • Clear the DTC from the PCM memory using the WDS or equivalent.
  • Turn the ignition switch off.
  • Start engine and warm it up completely.
  • Is PENDING CODE for this DTC present?
 Yes Replace PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION .)
No Go to the next step.
11 VERIFY AFTER REPAIR PROCEDURE 
 Yes Go to the applicable DTC inspection. (See DTC TABLE .)
No Troubleshooting completed.
(1) California emission regulation applicable ATX model
(2) Except for California emission regulation applicable ATX model
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