KE15 - Engine RPM Error During Self-Test
Diagnostic Trouble Code (DTC) 411 indicates that during Engine Running Self-Test, engine rpm could not be controlled within the Self-Test lower limit band.
Possible causes:
- Improper idle air flow set.
- Vacuum leaks.
- Throttle linkage binding.
- Throttle plates open.
- Improper ignition timing.
- Idle Air Control (IAC) solenoid contamination.
- IAC circuit short to ground.
- Damaged IAC solenoid.
- Does engine Idle speed appear normal?
Yes -- Remove IAC solenoid and Inspect for contamination. If contamination is present, determine if solenoid is a type that can be cleaned.
Hitachi Idle Air Control (IAC) Valve And Solenoid:
Hitachi
This type of IAC solenoid is serviceable and may be removed and cleaned of sludge deposits that accumulate within the valve.
Hitachi Idle Air Control (IAC) Valve And Solenoid:
Hitachi With Vent/Filter
This type of IAC solenoid is not serviceable and cannot be cleaned.
No contamination present or solenoid cannot be cleaned: Replace IAC solenoid. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)
Solenoid is contaminated and can be cleaned: Clean as necessary. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)
If Diagnostic Trouble Code (DTC)/symptom is still present, replace IAC solenoid.
No -- Reset idle airflow to specification. Refer to Fuel Delivery and Air Induction for idle airflow adjust procedure. If unable to reset idle to specification, go to KE16. KE16 - Check For Condition Affecting Idle