TROUBLE DIAGNOSES — Diagnostic Table (Cont'd) — Symptom 10: Abnormal idling — low idle (after warm-up)
EF & EC-48flowchartDiagnostic Table (Cont'd)
SYMPTOM & CONDITION 10 — Abnormal idling — low idle (after warm-up)
Possible Causes vs. Check Step Matrix — Symptom 10
| Category | Possible Causes | ① | ② | ③ | ④ | ⑤ | ⑥ | ⑦ |
|---|---|---|---|---|---|---|---|---|
| SPECIFICATIONS | Mixture ratio | O | O | |||||
| SPECIFICATIONS | Ignition timing (too retarded) | O | ||||||
| INTAKE SYSTEM | Throttle chamber (with ports clogged) | O | ||||||
| INTAKE SYSTEM | Throttle valve (clogged) | O | ||||||
| CONTROL SYSTEM | Crank angle sensor | O | ||||||
| CONTROL SYSTEM | Air flow meter | O | ||||||
| CONTROL SYSTEM | Engine temperature sensor | O | O |
SPECIFICATIONS
Possible CausesMixture ratio
①
②O
③
④O
⑤
⑥
⑦
SPECIFICATIONS
Possible CausesIgnition timing (too retarded)
①O
②
③
④
⑤
⑥
⑦
INTAKE SYSTEM
Possible CausesThrottle chamber (with ports clogged)
①
②
③O
④
⑤
⑥
⑦
INTAKE SYSTEM
Possible CausesThrottle valve (clogged)
①
②
③
④O
⑤
⑥
⑦
CONTROL SYSTEM
Possible CausesCrank angle sensor
①
②
③
④
⑤O
⑥
⑦
CONTROL SYSTEM
Possible CausesAir flow meter
①
②
③
④
⑤
⑥O
⑦
CONTROL SYSTEM
Possible CausesEngine temperature sensor
①
②
③
④
⑤
⑥O
⑦O
SERVICE PROCEDURE
Service Procedure Flowchart — Symptom 10: Low idle after warm-up
Rendering diagram…