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Home >> Buick >> 1987 >> Skyhawk Sport, 2.0 1, Standard >> Repair and Diagnosis >> Engine Performance >> System >> 2.0L PFI Tests >> Diagnostic Code Flow Charts >> Code 35, Idle Speed Error >> Notes

Code 35, Idle Speed Error: Notes

Code 35 will set when the closed throttle engine speed is 150 RPM above or below the 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. If idle is too low, "Scan" tester will display 80 or more counts. 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 the condition is unchanged, the IAC is not at fault. There is a system problem.
  2. When the engine was stopped, the IAC valve retracted to a fixed position for increased airflow during the next engine start. A "Scan" tester will display 80 or more counts.
  3. Be sure to disconnect the IAC valve prior to this 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 light. Disconnect ECM and turn the ignition on. Probe terminals to check for this condition.
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