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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 tool to Data Link Connector (DLC). Put scan tool into OPEN mode.
  2. Start engine and bring to normal operating temperature. Check for correct state of transmission range switch on scan tool. 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 the TESTS W/O CODES article.
CONTROLLED IDLE SPEED & IAC COUNT

Application Idle RPM (1) IAC Counts
Under 8500 GVW
Auto. Trans. (2) 565-615 50-30
Man. Trans. (3) 525-575 50-30
Over 8500 GVW
Auto. Trans. (2) 625-675 50-30
Man. Trans. (3) 675-725 50-30
(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.
(3) Manual transmission in Neutral. Tech 1 scan tool will display "RDL" with transmission in Neutral.
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