On-Vehicle Inspection; Resistance Inspection - Mazda 3 Workshop Manual

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
(3) Connect the EGR valve connector.
(4) Turn the ignition switch to the ON position.
(5) Using the "SEGRP" simulation function, verify that it operates with Steps 0 (idling) to 52.
• If the EGR valve operates, inspect the following:
- EGR pipe clogging
• If the EGR valve does not operate, inspect the following:
- PCM terminal voltage
• EGR valve signal
- EGR valve (If it is stuck or not moving smoothly, replace it with a new one.)
4. Warm up the engine to normal operating temperature.
5. Place the vehicle on the chassis dynamometer.
6. Monitor the following signals using the PID/data monitor.
• EGR valve step number (SEGRP)
• Engine speed (RPM)
• Vehicle speed (VSS)
• Throttle position (TP)
• Engine coolant temperature (ECT)
7. Verify that the EGR valve step number is 0 during idle.
8. Verify that the EGR valve step number increases when the accelerator pedal is depressed to increase
the vehicle speed.
• If it does not increase, inspect the following using the PID/data monitor.
- Vehicle speed (VSS)
- Throttle position (TP)
- Engine coolant temperature (ECT)
9. Stop the vehicle and verify that the EGR valve step number is 0 during idle.

On-vehicle Inspection

1. Verify that the buzzing sound (valve operation sound) is heard from the EGR valve when engine
cranking.
• If the buzzing sound is not heard, perform the resistance inspection.

Resistance Inspection

1. Disconnect the negative battery cable.
2. Disconnect the EGR valve connector.
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