TROUBLE DIAGNOSES — Diagnostic Table (Cont'd) — Symptom & Condition 14: Poor driveability — stumble (while accelerating)
EF & EC-52flowchartDiagnostic Table (Cont'd)
SYMPTOM & CONDITION 14 — Poor driveability — stumble (while accelerating)
Possible Causes vs. Check Steps Matrix
| Category | Possible Causes | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
|---|---|---|---|---|---|---|---|---|---|
| SPECIFICATIONS | Mixture ratio | O | O | O | O | ||||
| SPECIFICATIONS | Fuel pressure | O | O | ||||||
| FUEL SYSTEM | Fuel filter (clogged) | O | |||||||
| FUEL SYSTEM | Fuel line (clogged) | O | |||||||
| FUEL SYSTEM | Injectors (clogged) | O | |||||||
| IGNITION SYSTEM | Power transistor | O | O | ||||||
| IGNITION SYSTEM | Ignition coil | O | O | ||||||
| IGNITION SYSTEM | Spark plugs (ignition leaks, improper gap) | O | |||||||
| INTAKE SYSTEM | Air duct (leaks) | O | |||||||
| CONTROL SYSTEM | Crank angle sensor | O | O | ||||||
| CONTROL SYSTEM | Air flow meter | O | |||||||
| CONTROL SYSTEM | Engine temperature sensor | O | O | ||||||
| CONTROL SYSTEM | Exhaust gas sensor | O | |||||||
| CONTROL SYSTEM | Idle switch (remaining OFF) | O | |||||||
| OTHERS | Fuel (poor quality) |
SPECIFICATIONS
Possible CausesMixture ratio
1
2
3O
4
5O
6O
7
8O
SPECIFICATIONS
Possible CausesFuel pressure
1
2
3
4
5O
6O
7
8
FUEL SYSTEM
Possible CausesFuel filter (clogged)
1
2
3
4
5
6
7O
8
FUEL SYSTEM
Possible CausesFuel line (clogged)
1
2
3
4
5
6
7O
8
FUEL SYSTEM
Possible CausesInjectors (clogged)
1
2
3
4
5
6
7O
8
IGNITION SYSTEM
Possible CausesPower transistor
1O
2O
3
4
5
6
7
8
IGNITION SYSTEM
Possible CausesIgnition coil
1O
2O
3
4
5
6
7
8
IGNITION SYSTEM
Possible CausesSpark plugs (ignition leaks, improper gap)
1
2O
3
4
5
6
7
8
INTAKE SYSTEM
Possible CausesAir duct (leaks)
1
2
3
4O
5
6
7
8
CONTROL SYSTEM
Possible CausesCrank angle sensor
1
2
3O
4
5
6
7
8O
CONTROL SYSTEM
Possible CausesAir flow meter
1
2
3
4
5
6
7
8O
CONTROL SYSTEM
Possible CausesEngine temperature sensor
1
2
3O
4
5
6
7
8O
CONTROL SYSTEM
Possible CausesExhaust gas sensor
1
2
3
4
5
6
7
8O
CONTROL SYSTEM
Possible CausesIdle switch (remaining OFF)
1
2
3
4
5O
6
7
8
OTHERS
Possible CausesFuel (poor quality)
1
2
3
4
5
6
7
8
SERVICE PROCEDURE
Service Procedure Flowchart — Symptom 14
Rendering diagram…