High Idle Speed After Warm-up (continued)
F2-42flowchartHigh Idle Speed After Warm-up (steps 5-8)
1
STEP 5: Does engine speed decrease as engine warms up?
No
Check air valve (page F2-99)
Yes: Go to next step
2
STEP 6: Is idle air control valve OK? (page F2-99)
No
Repair or replace
Yes: Go to next step
3
STEP 7: Pinch PCV hose with pliers; does engine speed decrease?
Yes
Check PCV valve (page F2-124)
No: Go to next step
4
STEP 8: Are ECM terminal voltages OK? 1C-Starter signal; 2E-Engine coolant temperature sensor; 3D-Sensor ground (page F2-141)
No
Check for cause (page F2-141)
Yes
5
Try a known good ECM and check if condition improves (page F2-141)