S15/T15 2WD Jimmy V6-262 4.3L VIN W CPI (1993)
Idle Speed: Adjustments
CONTROLLED IDLE SPEED CHECK
NOTE Before performing this check:
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Verify no codes displayed
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Idle air control system has been checked
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Ignition timing is correct
PROCEDURE
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Set parking brake and block drive wheels.
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Connect a SCAN tool to the assembly line data link (ALDL) connect with tool in Open Mode.
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START engine and bring it to normal operating temperature.
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Check for correct state of PARK/NEUTRAL switch on SCAN tool.
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Check specifications chart for controlled idle speed and IAC valve pintle position (counts).
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If within specifications, the idle speed is being correctly controlled by the control module.
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If not within specifications, refer to DIAGNOSIS, TESTING AND INSPECTION PROCEDURES / TESTING PROCEDURES /
DIAGNOSIS BY SYMPTOM / ROUGH, UNSTABLE OR INCORRECT IDLE.
MINIMUM IDLE AIR RATE CHECK
Minimum Idle Air Rate is not adjustable on this engine.
CONTROLLED IDLE SPEED
Transmission
Gear
Idle Speed
IAC Counts [1]
OPEN/CLOSED Loop [2]
Auto
D
550
5-40
CL
[1] Add 2 counts for engines with less than 500 miles. Add 1 count for every 1000 ft. above sea level.
[2] Let engine idle until proper fuel control status is reached (OPEN/CLOSED loop).
