After Warming Up, Idle Speed Is Below Specification Without Load (MIL Works OK, No DTCs Set)

After warming up, idle speed is below specification without load (MIL works OK, no DTCs set)

After warming up, idle speed is below specification without load
(MIL works OK, no DTCs set)

Troubleshoot the alternator FR signal circuit Alternator FR Signal Circuit Troubleshooting.

Do the carbon accumulation check Testing and Inspection.

Troubleshoot the PSP switch signal circuit PSP Switch Signal Circuit Troubleshooting (R18A1 And R18A4 Engine).

Troubleshoot the injector control module circuit Injector Control Module Circuit Troubleshooting.

Replace the fuel filter A element Fuel Filter A Element Replacement.

Replace the fuel filter B element Fuel Filter B Element Replacement.

Inspect the PCV valve Testing and Inspection.

Also check for

Clogged injector