Trouble Diagnoses — Diagnostic Table (Cont'd) — Symptom 9: Abnormal idling — no fast idle
EF & EC-47flowchartDiagnostic Table (Cont'd)
SYMPTOM & CONDITION 9 — Abnormal idling — no fast idle
Possible Causes Matrix — Symptom 9
SPECIFICATIONS
Possible CausesMixture ratio
1O
2O
3
4O
5
6
SPECIFICATIONS
Possible CausesIgnition timing
1
2
3O
4
5
6
INTAKE SYSTEM
Possible CausesBlow-by hose (clogged)
1
2O
3
4
5
6
INTAKE SYSTEM
Possible CausesAir regulator (stuck closed)
1O
2
3
4
5
6
CONTROL SYSTEM
Possible CausesEngine temperature sensor
1
2
3
4
5O
6O
SERVICE PROCEDURE
Service Procedure Flowchart — Symptom 9: Abnormal idling — no fast idle
1
CHECK 1: Air regulator — Make sure air regulator stays open before warm-up.
N.G.
Check air regulator and/or its circuit. [See page EF & EC-110.]
O.K.
2
CHECK 2: Blow-by hose — Check blow-by hose for clogging.
N.G.
Clean or replace the hose.
O.K.
3
APPLY 3: Timing light — Check ignition timing.
Improved
Adjust ignition timing. [See page EF & EC-22.]
Not Improved
4
CHECK 4: Apply vacuum/pressure to pressure regulator after disconnecting vacuum hose, and check idling.
N.G.
Check idle mixture ratio. [See page EF & EC-25.]
O.K.
5
PERFORM 5: Self-diagnosis Mode III — Perform self-diagnosis Mode III (for engine temp. sensor).
N.G.
6
CRANK 6: Start with engine temp. sensor connector disconnected.
N.G.
Check sensor circuit. [See page EF & EC-86 (engine temp. sensor).]
See also
EF & EC-110TROUBLE DIAGNOSES — Diagnostic Procedure 14: AIR REGULATOR (Not self-diagnostic item)EF & EC-22Direct Ignition System (Cont'd) — Checking Ignition Timing and Idle SpeedEF & EC-25IDLE SPEED/IGNITION TIMING/IDLE MIXTURE RATIO INSPECTIONEF & EC-86Diagnostic Procedure 4 — ENGINE TEMPERATURE SENSOR (Code No. 13)