TROUBLESHOOTING GUIDE
F-37flowchartTroubleshooting Guide (Steps 5-8)
1
Connect System Selector to diagnosis connector and set Test Switch to 'SELF TEST' when engine is cold. Check if engine speed decreases as engine warms up
No
Check air valve (page F-99)
Yes
2
Go to next step
3
Disconnect ISC valve connector at idle and check if 'clicking' is heard from ISC valve
No
Check ISC valve (page F-99)
Yes
4
Go to next step
5
Pinch PCV hose with pliers and check if engine speed decreases
Yes
Check PCV valve (page F-117)
No
6
Go to next step
7
Check if ECU terminal voltages are OK (2D, 2O and 2Q) (page F-129)
No
Check for cause (Refer to 'Check Point for Each Terminal') (page F-132)
Yes
8
Try known good ECU (page F-127)