Purge Control System Inspection; A/C Cut-Off Control System Inspection - Mazda 3 Workshop Manual

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes

Purge Control System Inspection

1. Start the engine.
2. Disconnect the vacuum hose between the purge valve and the charcoal canister.
3. Put a finger to the purge valve and verify that there is no vacuum applied when the engine is cold.
• If there is a vacuum, inspect the following.
- Wiring harness and connectors (Purge valve-PCM terminal 2AN)
- Purge valve
4. Start the engine and warm it up completely.
5. Stop the engine.
6. Connect the WDS or equivalent to the DLC-2 and verify that the DTC P0443 is shown. Perform the
DTC inspection. (See DTC TABLE
7. Turn the ignition switch to the ON position.
8. Access ECT PID.
9. Verify that the engine coolant temperature is above 78 °C {173 °F}.
• If WDS or equivalent indicates below 78 °C {173 °F}, perform the ECT sensor inspection.
10. Access EVAPCP PID.
11. Increase the duty value of the purge valve to 50% and inspect if the operation sound of the valve is
heard.
• If the operation sound is heard, inspect for the loose or damaged vacuum hose. (Intake
manifold-purge valve-charcoal canister)
• If the operation sound is not heard, perform the purge valve inspection.

A/C Cut-off Control System Inspection

1. Start the engine.
2. Turn the A/C switch and fan switch on.
3. Verify that the A/C compressor magnetic clutch actuates.
• If it does not actuate, go to symptom troubleshooting "No.23 A/C does not work sufficiently".
4. Fully open the throttle valve and verify that the A/C compressor magnetic clutch does not actuate for 2-
5 s.
• If it actuates, inspect as follows.
(1) Connect the WDS or equivalent to the DLC-2.
(2) Turn the A/C switch off.
(3) Turn the ignition switch to the ON position.
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