Idle Speed & Ignition Timing

CAUTION: DO NOT attempt to adjust throttle stop screw to adjust idle. Throttle stop screw is factory-set and is used as zero reference point for all other adjustments.

NOTE: Idle speed is adjustable only on Aerio model.

NOTE: On all models, Suzuki scan tool is used to disable computer and check base timing. Timing is adjustable on all models, if timing is out of specification, check system related parts and readjust timing.

NOTE: Ensure ignition timing advances as engine speed increases.

Ensure idle speed and base ignition timing are set to specification. See IDLE SPEED SPECIFICATIONS and IGNITION TIMING tables. If necessary, see ON-VEHICLE ADJUSTMENTS article for adjustment procedures. If scan tool is available, check for correct IAC duty. See IAC DUTY AT SPECIFIED IDLE SPEED table.

IDLE SPEED SPECIFICATIONS

Application

⁽¹⁾ Idle RPM

Aerio

A/C Off

700-800

A/C On

A/T

700-800

M/T

800-900

Grand Vitara

A/C Off

700-800

A/C On

750-850

Vitara

A/C Off

700-800

A/C On

750-850

XL-7

A/C Off

640-740

A/C On

700-800

⁽¹⁾	Transaxle or transmission in Neutral or Park, unless stated otherwise in test procedure.

IAC DUTY AT SPECIFIED IDLE SPEED

Application

⁽¹⁾⁽²⁾ Percent

Aerio

35-45

Grand Vitara

10-50

Vitara

2-30

XL-7

5-40

⁽¹⁾	See IDLE SPEED SPECIFICATIONS table.

⁽²⁾	Engine at normal operating temperature with A/C OFF (if equipped).

IGNITION TIMING (Degrees BTDC @ RPM)

Application

⁽¹⁾ Timing Setting

Aerio ⁽²⁾

⁽³⁾ 4-6 @ 700-800

Grand Vitara ⁽²⁾

⁽³⁾ 4-6 @ 750-850

Vitara

⁽³⁾ 4-6 @ 750-850

XL-7 ⁽²⁾

⁽³⁾ 4-6 @ 750-850

⁽¹⁾	See ON-VEHICLE ADJUSTMENTS article for adjustment procedures.

⁽²⁾	Adjust CMP sensor to change ignition timing.

⁽³⁾	Suzuki scan tool connected to DLC required to check timing. See Fig 2 .

Fig 1: Adjusting Idle Speed &/Or Duty Cycle (Aerio)