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Code 35 - Idle Speed Error: Notes

Code 35 will set when closed throttle engine speed is 150 RPM above or below correct 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 properly. If idle is too low, "Scan" tester will display 80 or more counts or steps. If idle is high it will display zero counts. Occasionally an erratic or unstable idle may occur. Engine speed may vary 200 RPM or more up and down. Disconnect IAC. If condition is unchanged, IAC is not at fault.
  2. When the engine was stopped, the IAC valve retracted (more air) to a fixed position to provide increased airflow during next engine start. During the next engine start, a "Scan" should display 100 or more counts.
  3. Disconnect IAC valve prior to this test. The test light will confirm the ECM signals by displaying a steady or flashing light on all circuits.
  4. Test verifies faulty IAC, short to voltage (steady light) or poor IAC connection.
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