TROUBLESHOOTING GUIDE — 14. IDLE MOVES UP AND DOWN
F-40flowchart14. IDLE MOVES UP AND DOWN
Description
DESCRIPTION
ItemsEngine speed up and down periodically at idle
NOTE
[TROUBLESHOOTING HINTS]
1) Fuel cut occurs at idle
- Air valve not closing after warm-up and idle speed reaches to fuel cut speed
2) Fuel injection amount fluctuating
- Bad contact point inside airflow meter
3) Air leakage of intake air system
4) Poor ignition spark
5) Air/Fuel mixture too rich
6) Evaporative emission control system malfunction
7) Low engine compression
Troubleshooting Guide (Steps 1-3)
1
Check if '00' is displayed on Self-Diagnosis Checker with ignition switch ON (page F-78)
No
Malfunction Code No. displayed: Check for cause (Refer to specified check sequence) (page F-80)
No
'88' flashes: Check ECU terminal 1F voltage (page F-128). Voltage: Approx. 12V (Ignition switch ON). If OK, replace ECU (page F-127). If not OK, check wiring between ECU and Self-Diagnosis Checker (page F-7)
'88' flashes: Check ECU terminal 1F voltage (page F-128). Voltage: Approx. 12V (Ignition switch ON). If OK, replace ECU (page F-127). If not OK, check wiring between ECU and Self-Diagnosis Checker (page F-7)
Yes
2
Go to next step
3
Check for correct idle speed (page F-76). Idle speed: 850 ± 50 rpm
No
Check if idle speed can be adjusted by turning air adjust screw. If OK, adjust idle speed. If not OK, check air valve (page F-99)
Yes
4
Go to next step
5
Check for correct ignition timing at idle (page F-75). Ignition timing: 10° ± 1° BTDC
No
Adjust (page F-75)
Yes
6
Go to next step