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Idle Speed: 626

  1. Connect NGS scan tool to DLC-2 located under left side of instrument panel, right of steering column. See Figure . Start engine and allow it to idle. Using NGS scan tool, select PID/DATA MONITOR AND RECORD, press TRIGGER.
  2. Select RPM and press TRIGGER. Verify idle speed. See IDLE SPEED SPECIFICATIONS  table. If idle speed is not within specification, select HDLMP under PID/DATA MONITOR AND RECORD. Press TRIGGER. Verify HDLMP status changes from OFF to ON when operating headlight switch (PASSING position). If HDLMP status changes, go to next step. If HDLMP status does not change, see appropriate STEERING COLUMN SWITCHES article in ACCESSORIES & EQUIPMENT.
    3. NOTE: DO NOT adjust Throttle Adjusting Screw (TAS). Throttle adjusting screw is preset and if adjusted, will adversely affect engine performance.
    NOTE: Inductive pick-up type tachometer may read double engine speed.
    NOTE: If engine drops to well below specification or dies during following procedure, vehicle will go out of self-test mode and adjustment may be incorrect. Turn AAS out one turn and start adjustment procedure over.
  3. Connect inductive-type tachometer. Select DIAGNOSTIC TEST MODES. Press TRIGGER. Select KOER ON-DEMAND SELF-TEST. Press TRIGGER. After scan tool displays FOR EXAMPLE BOO, PSP AND TCS, operate headlight switch to (PASSING position) 3 times (for 2 seconds each time). Ensure idle speed is fixed. Within 2 minutes, adjust idle speed to specification by turning Air Adjusting Screw (AAS). See Fig 3 and Fig 4 . See IDLE SPEED SPECIFICATIONS  table.
IDLE SPEED SPECIFICATIONS

Application Specification
B2300 (1)
B3000 760-800
B4000 760-800
Miata (2) 750-850
Millenia (2) 600-700
MPV 700-800
Protege & Protege5 (2) 650-750
Tribute
2.0L 800-900
3.0L 730-750
626
2.0L
A/T 500-800
M/T 550-850
2.5L 550-750
(1) Information is not available from manufacturer.
(2) With fused jumper wire connected between ground and TEN terminal at DLC-1.
Fig 1: Rotating Air Adjusting Screw (Miata)
G00110205Courtesy of MAZDA MOTORS CORP.
Fig 2: Rotating Air Adjusting Screw (Millenia 2.3L)
G00110206Courtesy of MAZDA MOTORS CORP.
Fig 3: Rotating Air Adjusting Screw (Millenia & 626 2.5L)
G96J10156Courtesy of MAZDA MOTORS CORP.
Fig 4: Rotating Air Adjusting Screw (Protege, Protege5 & 626 2.0L)
G00110207Courtesy of MAZDA MOTORS CORP.
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