Ignition "OFF".

Disconnect Throttle actuator.

Measure resistance between terminal 1 and 2 of throttle actuator connecor(Component side).

Specification : 14 ~ 17 Ω ( 20°C)

Is the measued resistance within specifications ?

YES

▶ Go to "Check Throttle Actuator Operation" as below.

NO

▶ Substitute with a known-good throttle actuator and check for proper operation.

If the problem is corrected, replace throttle actuator and then go to "Verification of Vehicle Repair" procedure.

Ignition "ON" & Engine "ON".

Check that operating duty of throttle actuator is around 5% at idle.

Check that vaccum is felt after disconnecting vaccum hose from throttle actuator valve.

Check that vaccum is felt at the moment after ignition off.

Is the vaccum felt according to the operating duty of throttle actuator ?

YES

▶ Substitute with a known-good ECM and check for proper operation.

If the problem is corrected, replace ECM and then go to "Verification of Vehicle Repair" procedure.

NO

▶ Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure .