TROUBLE DIAGNOSES — Diagnostic Table (Cont'd) — Symptom & Condition 3
EF & EC-41flowchartUnverifiedDiagnostic Table (Cont'd)
SYMPTOM & CONDITION 3
POSSIBLE CAUSES (○ = candidate cause, column = procedure step)
SPECIFICATIONS
Possible causeMixture ratio
Procedure step(s) [?] — column placement of ○ marks not pixel-confirmed[?]
FUEL SYSTEM
Possible causeFuel pressure (too low)
Procedure step(s) [?] — column placement of ○ marks not pixel-confirmed[?]
FUEL SYSTEM
Possible causeIgnition timing
Procedure step(s) [?] — column placement of ○ marks not pixel-confirmed[?]
FUEL SYSTEM
Possible causeFuel filter (clogged)
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 causeInjectors (clogged)
Procedure step(s) [?] — column placement of ○ marks not pixel-confirmed[?]
FUEL SYSTEM
Possible causePressure regulator
Procedure step(s) [?] — column placement of ○ marks not pixel-confirmed[?]
FUEL SYSTEM
Possible causePressure regulator vacuum hose (clogged)
Procedure step(s) [?] — column placement of ○ marks not pixel-confirmed[?]
IGNITION SYSTEM
Possible causeSpark plugs (wet with fuel)
Procedure step(s) [?] — column placement of ○ marks not pixel-confirmed[?]
IGNITION SYSTEM
Possible causeIgnition switch
Procedure step(s) [?] — column placement of ○ marks not pixel-confirmed[?]
INTAKE SYSTEM
Possible causeThrottle chamber (with ports clogged)
Procedure step(s) [?] — column placement of ○ marks not pixel-confirmed[?]
INTAKE SYSTEM
Possible causeThrottle valve (clogged)
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 causeCrank angle sensor
Procedure step(s) [?] — column placement of ○ marks not pixel-confirmed[?]
SERVICE PROCEDURE
Diagnostic flow — Symptom 3 (impossible to start, partial combustion)
1
1. LISTEN — Listen for injector operating sound.
N.G.
Check injector circuit. [See page EF & EC-112.]
O.K.
2
2. CHECK — Check vacuum hose of pressure regulator for clogging.
N.G.
Repair or replace the hose.
O.K.
3
3. REMOVE — Remove vacuum hose from pressure regulator, and try to start.
Improved
4. MEASURE — Connect vacuum hose to pressure regulator and measure fuel pressure.
4. MEASURE — Connect vacuum hose to pressure regulator and measure fuel pressure.
Check idle mixture ratio. [See page EF & EC-25.]
Not improved [?]
4
5. CHECK — Check throttle chamber ports and valve for clogging.
N.G.
Clean the ports and/or throttle valve.
O.K.
5
6. CHECK — Remove spark plugs and check their ignition sparks by cranking (ignition coil).
For crank angle sensor / engine temp sensor
Check the sensor circuits: engine temp sensor [EF & EC-86], crank angle sensor [EF & EC-82].
O.K. [?]
6
7. CHECK — Check flashes of timing light for weakness (uses power transistor KV10090109S0).
N.G.
Check ignition signal circuit. [See page EF & EC-90.]
O.K. [?]
7
8. CHECK — Check ignition timing; adjust ignition timing. [See page EF & EC-22.]
next [?]
8
9. PERFORM — Perform self-diagnosis Mode IV (for start signal).
N.G.
Check starter circuit. [See page EF & EC-104.]
O.K. [?]
9
10. PERFORM — Perform self-diagnosis Mode III (for engine temp. sensor and crank angle sensor).
next [?]
10
11. CRANK / START — Start with engine temp. sensor connector disconnected.
See also
EF & EC-22Direct Ignition System (Cont'd) — Checking Ignition Timing and Idle SpeedEF & 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-104Diagnostic Procedure 11 — START SIGNAL (Switch ON/OFF diagnosis)EF & EC-112TROUBLE DIAGNOSES — Diagnostic Procedure 15 — INJECTOR (Not self-diagnostic item)