Tracker 4WD L4-1.6L VIN 6 (1998)
Idle Speed: Adjustments
Using A Scan Tool
IMPORTANT: Before starting the engine, place the manual selector in P (automatic transaxle) or place the gearshift control lever in neutral (manual
transaxle), set the parking brake and block the drive wheels.
Check following for correct condition and operation.
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Check the accelerator cable for free movement and excessive play. Cable free play should be within specification.
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Inspect the lead wires and the hoses of the Sequential Multiport Fuel Injection (SFI) and the Evaporative Emission (EVAP) control systems for
being connected securely.
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Check the ignition timing. Adjust the ignition timing if necessary.
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Turn OFF all accessories (A/C, wipers, heater, lights, etc.).
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Make sure that the Air Cleaner (ACL) is installed correctly.
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Check the Air Induction system for restrictions.
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Check the vacuum hoses for correct routing. Refer to the Emission Label.
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Check for vacuum leaks, repair as necessary.
IMPORTANT:
The Idle Air Control (IAC) Calibration Mode is an internal function in the PCM and is used to provide a base duty cycle. Therefore, when the vehicle
is in the IAC Calibration Mode the IAC Duty Cycle will read approximately 50%. But, when in a normal idle state and reviewing the Engine Data List
the IAC Duty Cycle will read approximately 25%, this is to be considered normal operation.
If the IAC Duty remains unchanged when the adjusting screw is turned, check the duty output terminal circuit, A/C signal circuit, PSP switch signal
circuit, PNP switch circuit (A/T) and ECT sensor performance.
Adjustment Procedure
1. Start the engine.
2. Allow the engine to reach normal operating temperature.
3. Connect a scan tool.
4. Using the scan tool, select IAC Calibration. This parameter is listed under Special Functions.
5. Check the IAC duty cycle. The IAC duty cycle should read 50 percent with the correct engine idle speed.
6. Adjust the idle speed by turning the Idle Air Control (IAC) duty adjusting screw (1).
7. Disconnect the scan tool.
8. Install the IAC duty adjusting screw plug.
9. Check the specified idle speed is obtained with the A/C ON (If equipped with A/C).
