Service manual

G420F(FE) Service Manual 273 Chapter 8. Basic Troubleshooting
High Idle Speed
Engine idles above the range of 700-1000 rpm.
PRELIMINARY CHECKS
Perform the visual checks as described at start of “ Basic Troubleshooting” chapter.
PROBABLE CAUSE CORRECTIVE ACTION
Incorrect idle speed control
Check all hoses and gaskets for cracking, kinks, or leaks.
Verify that there are no vacuum leaks.
See Chapter 8 Advanced Diagnostics & Chapter 6 Tests and
Adjustments
Throttle sticking
Replace throttle.
See Fault Code 461: ETC_Sticking
Foot pedal sticking or incorrect pedal signal
Check pedal return spring travel for binding.
Check APP function with Service Tool.
Verify smooth change of APP reading with pedal movement.
See Chapter 8 Advanced Diagnostics.
Engine mechanical
Check for vacuum hose leak.
Check for PCV malfunction.
Check for defective intake gasket.
Related MIL Faults:
ETC Sticking fault
Idle adapt out of range
MAP Sticking fault
MAP high value