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Controlled Idle Speed Check

  1. Ensure no trouble code(s) are present, IAC system is okay, and ignition timing is correct. Block drive wheels. Apply parking brake. Connect Tech 1 scan tester to Data Link Connector (DLC). Put scan tester into OPEN mode.
  2. Start engine and bring to normal operating temperature. Check for correct state of park/neutral switch on scan tester. Check if idle speed and IAC valve pintle position (counts) are as specified. See CONTROLLED IDLE SPEED & IAC COUNT table.
  3. If idle speed is not within specification, refer to TESTS W/O CODES article.
CONTROLLED IDLE SPEED & IAC COUNT

Application Idle RPM (1) IAC Counts
4.3L CSI
AWD (2) 625 5-30
2WD (2) 550 5-30
(1) Add 2 counts for engines with less than 500 miles. Add 2 counts for every 1000 ft. above sea level.
(2) Automatic transmission in Drive.
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