TROUBLE DIAGNOSES — Diagnostic Table (Cont'd) — Symptom & Condition 7
EF & EC-45flowchartUnverifiedDiagnostic Table (Cont'd)
SYMPTOM & CONDITION 7
POSSIBLE CAUSES (○ = candidate cause, column = procedure step)
SPECIFICATIONS
Possible causeMixture ratio
Procedure step(s) [?] — column placement of ○ marks not pixel-confirmed[?]
SPECIFICATIONS
Possible causeFuel pressure
Procedure step(s) [?] — column placement of ○ marks not pixel-confirmed[?]
SPECIFICATIONS
Possible causeIgnition sparks (missing)
Procedure step(s) [?] — column placement of ○ marks not pixel-confirmed[?]
SPECIFICATIONS
Possible causeIgnition timing
Procedure step(s) [?] — column placement of ○ marks not pixel-confirmed[?]
FUEL SYSTEM
Possible causeFuel pump (improper operation)
Procedure step(s) [?] — column placement of ○ marks not pixel-confirmed[?]
FUEL SYSTEM
Possible causeFuel line (clogged)
Procedure step(s) [?] — column placement of ○ marks not pixel-confirmed[?]
FUEL SYSTEM
Possible causeCanister (air leaks)
Procedure step(s) [?] — column placement of ○ marks not pixel-confirmed[?]
FUEL SYSTEM
Possible causePressure regulator (low fuel pressure)
Procedure step(s) [?] — column placement of ○ marks not pixel-confirmed[?]
IGNITION SYSTEM
Possible causeSpark plugs (improper gap)
Procedure step(s) [?] — column placement of ○ marks not pixel-confirmed[?]
CONTROL SYSTEM
Possible causeCrank angle sensor
Procedure step(s) [?] — column placement of ○ marks not pixel-confirmed[?]
CONTROL SYSTEM
Possible causeEngine temperature sensor
Procedure step(s) [?] — column placement of ○ marks not pixel-confirmed[?]
CONTROL SYSTEM
Possible causeIdle switch
Procedure step(s) [?] — column placement of ○ marks not pixel-confirmed[?]
CONTROL SYSTEM
Possible causeNeutral switch
Procedure step(s) [?] — column placement of ○ marks not pixel-confirmed[?]
OTHERS
Possible causeStarter (operation too slow)
Procedure step(s) [?] — column placement of ○ marks not pixel-confirmed[?]
OTHERS
Possible causeBattery (voltage too low)
Procedure step(s) [?] — column placement of ○ marks not pixel-confirmed[?]
SERVICE PROCEDURE
Diagnostic flow — Symptom 7 (hard to start every time)
1
1. LISTEN — Listen for fuel pump operating sound.
N.G.
Check fuel pump and/or related circuits. [See page EF & EC-102.]
O.K.
2
2. CHECK — Make sure tachometer indicates about 300 rpm while cranking.
N.G.
3. MEASURE — Measure battery voltage.
3. MEASURE — Measure battery voltage.
Charge the battery.
O.K. [?]
3
4. CRANK — Advance/retard ignition timing and try to start (using crank angle sensor and ignition switch).
No change
(No change) → Proceed to other steps.
Improved
(Improved) → Check idle mixture ratio. [See page EF & EC-25.]
next [?]
4
5. REMOVE — Remove vacuum hose from pressure regulator, and try to start.
next [?]
6. CHECK — Check flashes of timing light for weakness (uses power transistor KV10901050).
Improved
5
7. MEASURE — Connect vacuum hose to pressure regulator and measure fuel pressure.
next [?]
6
8. CHECK — Check vacuum hose of canister for air leaks.
N.G.
Repair or replace the hose.
O.K. [?]
7
9. CHECK — Remove spark plugs and measure their gaps; check ignition sparks at coil.
N.G.
Replace the wires.
O.K.
8
11. PERFORM — Perform self-diagnosis Mode III/IV (engine temp sensor, crank angle sensor, neutral switch, idle switch).
(check malfunctioning circuits)
9
Check the malfunctioning circuits: [See pages EF & EC-86 (engine temp sensor), EF & EC-82 (crank angle sensor), EF & EC-94 (neutral switch / idle switch).]
See also
EF & EC-25IDLE SPEED/IGNITION TIMING/IDLE MIXTURE RATIO INSPECTIONEF & EC-82Diagnostic Procedure 2 — CRANK ANGLE SENSOR (Code No. 11)EF & EC-86Diagnostic Procedure 4 — ENGINE TEMPERATURE SENSOR (Code No. 13)EF & EC-90Trouble Diagnoses — Diagnostic Procedure 6: IGNITION SIGNAL (Code No. 21) & DETONATION SENSOR (Code No. 34)EF & EC-94Diagnostic Procedure 7 — IDLE SWITCH (Switch ON/OFF diagnosis)EF & EC-102Diagnostic Procedure 10 — FUEL PUMP (Not self-diagnostic item)