TROUBLE DIAGNOSES — Diagnostic Table (Cont'd) — Symptom & Condition 17: Poor driveability — detonation
EF & EC-55flowchartDiagnostic Table (Cont'd)
SYMPTOM & CONDITION 17 — Poor driveability — detonation
Possible Causes and Check Step Matrix
| Category | Possible Causes | ① | ② | ③ | ④ | ⑤ |
|---|---|---|---|---|---|---|
| SPECIFICATIONS | Mixture ratio (too lean) | O | O | |||
| SPECIFICATIONS | Fuel pressure (low) | O | ||||
| SPECIFICATIONS | Ignition timing (too advanced) | O | ||||
| FUEL SYSTEM | Fuel filter (clogged) | O | ||||
| FUEL SYSTEM | Fuel line (clogged) | O | ||||
| FUEL SYSTEM | Injectors (clogged) | O | ||||
| CONTROL SYSTEM | Crank angle sensor (improper 1° signals) | O | ||||
| CONTROL SYSTEM | Air flow meter | O | ||||
| CONTROL SYSTEM | Engine temperature sensor | O | ||||
| OTHERS | Engine coolant temperature (too high) | O | ||||
| OTHERS | Fuel (low octane rating, poor quality) |
SPECIFICATIONS
Possible CausesMixture ratio (too lean)
①
②
③O
④O
⑤
SPECIFICATIONS
Possible CausesFuel pressure (low)
①
②
③O
④
⑤
SPECIFICATIONS
Possible CausesIgnition timing (too advanced)
①
②O
③
④
⑤
FUEL SYSTEM
Possible CausesFuel filter (clogged)
①
②
③
④O
⑤
FUEL SYSTEM
Possible CausesFuel line (clogged)
①
②
③
④O
⑤
FUEL SYSTEM
Possible CausesInjectors (clogged)
①
②
③
④O
⑤
CONTROL SYSTEM
Possible CausesCrank angle sensor (improper 1° signals)
①
②
③
④
⑤O
CONTROL SYSTEM
Possible CausesAir flow meter
①
②
③
④
⑤O
CONTROL SYSTEM
Possible CausesEngine temperature sensor
①
②
③
④
⑤O
OTHERS
Possible CausesEngine coolant temperature (too high)
①O
②
③
④
⑤
OTHERS
Possible CausesFuel (low octane rating, poor quality)
①
②
③
④
⑤
SERVICE PROCEDURE
Service Procedure Flowchart — Symptom 17
Rendering diagram…