Trouble Diagnoses — Diagnostic Table (Cont'd) — Symptom 4: Impossible to start — partial combustion (throttle position changes combustion quality)
EF & EC-42flowchartDiagnostic Table (Cont'd)
Symptom & Condition 4: Impossible to start — partial combustion (throttle position changes combustion quality)
| SYSTEM | POSSIBLE CAUSES | 1 | 2 | 3 | 4 | 5 |
|---|---|---|---|---|---|---|
| INTAKE SYSTEM | Throttle chamber (with ports clogged) | O | ||||
| INTAKE SYSTEM | Throttle valve (clogged) | O | ||||
| INTAKE SYSTEM | Air regulator (stuck closed) | O | ||||
| CONTROL SYSTEM | Engine temperature sensor | O | ||||
| CONTROL SYSTEM | Idle switch | O | ||||
| CONTROL SYSTEM | Neutral switch | O |
INTAKE SYSTEM
POSSIBLE CAUSESThrottle chamber (with ports clogged)
1O
2
3
4
5
INTAKE SYSTEM
POSSIBLE CAUSESThrottle valve (clogged)
1
2O
3
4
5
INTAKE SYSTEM
POSSIBLE CAUSESAir regulator (stuck closed)
1
2
3O
4
5
CONTROL SYSTEM
POSSIBLE CAUSESEngine temperature sensor
1
2
3
4O
5
CONTROL SYSTEM
POSSIBLE CAUSESIdle switch
1
2
3
4O
5
CONTROL SYSTEM
POSSIBLE CAUSESNeutral switch
1
2
3
4
5O
SERVICE PROCEDURE
Service Procedure — Symptom 4
Rendering diagram…