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Home >> Mazda >> 1990 >> 929 Base >> Repair and Diagnosis >> Engine Performance >> System >> EGR Function Testing >> Testing >> EGR Valve - Rotary Engine >> EGR Solenoid Valve
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EGR Solenoid Valve

  1. Remove electrical connector from EGR solenoid valve (Gray dot). Remove vacuum hose at EGR valve. Connect a vacuum gauge to EGR vacuum hose. Warm engine to operating temperature.
  2. Increase engine speed to 1100-3300 RPM. Vacuum gauge should not read any vacuum. Allow engine to idle. Apply 12 volts across EGR solenoid valve terminals. Increase engine speed again. Vacuum gauge should now read vacuum.
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