TROUBLESHOOTING GUIDE — 13. ROUGH IDLE JUST AFTER STARTING
F-39flowchart13. ROUGH IDLE JUST AFTER STARTING
Description
DESCRIPTION
ItemsEngine starts normally but vibrates excessively just after starting
NOTE
[TROUBLESHOOTING HINTS]
1) Fuel injection control and idle speed control malfunction
- Start signal not input to ECU
2) Idle speed misadjustment
3) Ignition timing misadjustment
Troubleshooting Guide (Steps 1-5)
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 switches for correct operation with Self-Diagnosis Checker Monitor Lamp and ignition switch ON (page F-89)
No
Lamp not ON/OFF with specified switch: Check for cause (Refer to specified check sequence) (page F-90)
No
Lamp always ON: Check wiring between ECU terminal 1D and Self-Diagnosis Checker (page F-7)
Yes
4
Go to next step
5
Check if ECU terminal 1C voltage is OK (page F-128). Voltage: Approx. 10V (While cranking)
No
Check for cause (Refer to 'Check Point for Each Terminal') (page F-131)
Yes
6
Go to next step
7
Check for correct ignition timing at idle (page F-75). Ignition timing: 10° ± 1° BTDC
No
Adjust (page F-75)
Yes
8
Check for correct idle speed (page F-76). Idle speed: 850 ± 50 rpm. If OK, go to next step (page F-76). If not OK, adjust idle speed.
9
Try known good ECU and check if condition improves (page F-127)
See also
F-7OUTLINE - WIRING DIAGRAMF-75ENGINE TUNE-UPF-76ENGINE TUNE-UPF-78SELF-DIAGNOSIS FUNCTIONF-80SELF-DIAGNOSIS FUNCTIONF-89SELF-DIAGNOSIS FUNCTIONF-90SELF-DIAGNOSIS FUNCTIONF-127CONTROL SYSTEM - Engine Control Unit InspectionF-128CONTROL SYSTEM - Engine Control Unit Terminal Voltage TableF-131CONTROL SYSTEM - Check Point for Each Terminal