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Home >> Mazda >> 1987 >> 626 Base >> Repair and Diagnosis >> Engine Performance >> System >> Idle-Up System >> Component Testing >> Air By-Pass Solenoid Valve

Air By-Pass Solenoid Valve

  1. Ensure all accessories are off and connect a tachometer. Bring engine to normal operating temperature and run at idle. Disconnect air by-pass solenoid valve connector and ensure the engine idle is 750-800 RPM (M/T) and 900-950 RPM (A/T). Adjust if necessary.
  2. Apply battery power and ground to each connector terminal. See Fig 1 . See IDLE-UP SPECIFICATIONS  table. Ensure engine RPM for each system is within specifications. Adjust each system RPM by turning the appropriate valve adjusting screw.
  3. With engine off and air by-pass valve connector disconnected, use an ohmmeter to check resistance of each system. See RESISTANCE SPECIFICATIONS  table. Use connector terminal location as previously shown. See Fig 1 .
Fig 1: Testing Idle-Up System
G65775Courtesy of MAZDA MOTORS CORP.
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