Mazda 3 - Egr Valve Inspection; EGR Control Inspection; Without Using WDS or Equivalent; Using WDS or Equivalent

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
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1
EGR pipe (Exhaust manifold side)
(See EXHAUST SYSTEM REMOVAL/INSTALLATION [Z6].)
2
EGR valve
5. Install in the reverse order of removal.
EGR VALVE INSPECTION
B3E011620300W03
EGR Control Inspection
Without using WDS or equivalent
1. Inspect the following:
• EGR pipe clogging
• PCM terminal voltage
- EGR valve signal
- Vehicle speed signal
- Throttle opening signal
- Engine coolant temperature signal
• EGR valve (If it is stuck or not moving smoothly, replace it with a new one.)
Using WDS or equivalent
1. Connect the WDS or equivalent to the DLC-2.
2. Start the engine.
3. Using the "SEGRP" simulation function, operate with Steps 0 (idling) to 52 and verify that the engine
speed becomes unstable or the engine stalls.
• If the engine speed does not change, perform the following procedure:
(1) Stop the engine.
(2) Remove the EGR valve.