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Code 35, Idle Speed Error

Code 35 will set if the closed throttle idle speed is 175 RPM greater than or less than desired idle speed for 20 seconds.

NOTE: Test numbers refer to test numbers on diagnostic chart.
  1. Continue with test, even if engine will not idle. If idle is too low, "Scan" tester will display 80 or more counts. If idle is too high, "Scan" will display zero counts. Engine speed may vary 200 RPM or more. Disconnect IAC electrical connector. If condition remains, IAC is not at fault.
  2. When engine was stopped, IAC valve retracted (more air) to a fixed "Park" position for increased airflow during next engine start. A "Scan" tester will display 75 or more counts.
  3. Be sure to disconnect IAC valve prior to test. The test light will confirm the ECM signals by a steady or flashing light on all circuits.
  4. There is a remote possibility that one of the circuits is shorted to voltage, which would have been indicated by a steady test light. Disconnect ECM and turn ignition on and probe terminals to check for this condition.
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