Purge Control System Inspection - Mazda 3 Workshop Manual

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
• If the operation sound is not heard, connect WDS or equivalent to the DLC-2 and verify that the
DTC P0403 is shown. Perform the DTC inspection. (See
2. Start the engine and idle it.
3. Increase the step value of EGR valve from 0 to 40 using SEGRP PID.
4. Operate the EGR valve and inspect if the engine speed becomes unstable or the engine stalls.
• If the engine speed will not change, proceed to following.
(1) Stop the engine.
(2) Remove the EGR valve.
(3) Connect the EGR valve connector.
(4) Turn the ignition switch to the ON position.
(5) Increase the step value of EGR valve from 0 to 40 using SEGRP PID.
(6) Inspect the EGR operation.
• If the EGR valve is operated, clean the EGR valve and reinspect from Step 2.
• If the EGR valve will not operate, replace the EGR valve and reinspect from Step 2.
5. Start the engine and warm it up completely.
6. Access the following PIDs.
• ECT
• RPM
• SEGRP
• TP
• VSS
7. Idle the vehicle and verify that the SEGRP value is 0.
8. Drive the vehicle.
9. Depress the accelerator pedal and verify that the SEGRP value is increased.
• If the SEGRP value will not increase, inspect the VSS, TP and ECT PIDs. (See
INSPECTION [Z6].)
10. Stop the vehicle and verify that the SEGRP value is returned 0.

Purge Control System Inspection

1. Connect the WDS or equivalent to the DLC-2.
2. Start the engine and idle it.
3. Access ECT PID.
4. Verify that the engine coolant temperature is 60 °C {140 °F} or more.
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DTC TABLE [Z6].)
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