TROUBLE DIAGNOSES — Diagnostic Table (Cont'd) — Symptom & Condition 13: Unstable idling — after warm-up
EF & EC-51flowchartDiagnostic Table (Cont'd)
SYMPTOM & CONDITION 13 — Unstable idling — after warm-up
Diagnostic Table — Symptom 13: Unstable idling after warm-up
SPECIFICATIONS
Possible CausesMixture ratio
①O
②O
③O
④O
⑤
⑥
⑦
⑧
⑨
SPECIFICATIONS
Possible CausesIgnition sparks
①
②
③
④
⑤O
⑥O
⑦
⑧
⑨
SPECIFICATIONS
Possible CausesIgnition timing
①
②
③
④
⑤
⑥
⑦O
⑧
⑨
SPECIFICATIONS
Possible CausesCompression pressure
①
②
③
④
⑤
⑥
⑦
⑧O
⑨
FUEL SYSTEM
Possible CausesFuel line (clogged)
①
②
③
④
⑤
⑥
⑦
⑧
⑨
FUEL SYSTEM
Possible CausesCanister (air leaks)
①
②
③O
④
⑤
⑥
⑦
⑧
⑨
FUEL SYSTEM
Possible CausesPressure regulator control solenoid
①
②
③
④O
⑤
⑥
⑦
⑧
⑨
IGNITION SYSTEM
Possible CausesPower transistor
①
②
③
④
⑤O
⑥O
⑦
⑧
⑨
IGNITION SYSTEM
Possible CausesIgnition coil
①
②
③
④
⑤O
⑥O
⑦
⑧
⑨
INTAKE SYSTEM
Possible CausesBlow-by hose (leaks)
①O
②
③
④
⑤
⑥
⑦
⑧
⑨
INTAKE SYSTEM
Possible CausesAir duct (leaks)
①
②O
③
④
⑤
⑥
⑦
⑧
⑨
CONTROL SYSTEM
Possible CausesIdle switch
①
②
③
④
⑤
⑥
⑦
⑧
⑨O
SERVICE PROCEDURE
Service Procedure — Unstable idling after warm-up
Rendering diagram…
See also
EF & EC-114Diagnostic Procedure 16 — PRESSURE REGULATOR (P.R.) CONTROL SOLENOID VALVE (Not self-diagnostic item)EF & EC-90Trouble Diagnoses — Diagnostic Procedure 6: IGNITION SIGNAL (Code No. 21) & DETONATION SENSOR (Code No. 34)EF & EC-22Direct Ignition System (Cont'd) — Checking Ignition Timing and Idle SpeedEF & EC-94Diagnostic Procedure 7 — IDLE SWITCH (Switch ON/OFF diagnosis)EM section