FI/EFI System — Symptom — Engine Often Stalls, page 13

EFI SYSTEM — Troubleshooting                                                                                                                FI-13

SYMPTOM — ENGINE OFTEN STALLS

CHECK DIAGNOSIS SYSTEM
Check for output of diagnostic code
(See page FI-22)

                Normal code
                     |
                     v
CHECK FOR VACUUM LEAKS IN AIR
INTAKE LINE
                     |
                    OK
                     |
                     v
CHECK FUEL SUPPLY TO INJECTOR
1. Fuel in tank
2. Fuel pressure in fuel line
   (1) Short fuel pump check terminals.
   (2) You can feel fuel pressure at fuel
        hose.
   (See page FI-45)
                     |
                    OK
                     |
                     v
CHECK AIR FILTER ELEMENT
                     |
                    OK
                     |
                     v
CHECK IDLE SPEED
STD: 650 rpm
                     |
                    OK
                     |
                     v
CHECK IGNITION TIMING
1. Short both terminals of the
   check connector.
2. Check ignition timing.
   STD: 10° BTDC
        (w/short terminals of the
        check connector)
                     |
                    OK
                     |
                     v
CHECK SPARK PLUGS
Max. allowable gap: 1.4 mm (0.055 in.)
Precaution: Never attempt to adjust gap
             on used platinum tipped spark plug.
             — Note —
             Check compression pressure if necessary.
             (See page EM-6)
                     |
                    OK
                     |
                     v
CHECK COLD START INJECTOR
(See page FI-49)
                     |
OK CONTINUED ON PAGE FI-14

Malfunction
code(s) ————————> Diagnostic code(s) (See page FI-25)

BAD ————————> 1. Oil filler cap
                2. Oil level gauge
                3. Hose connections
                4. PCV valve
                5. EGR system — EGR valve stays open

BAD ————————> 1. Fuel line — leakage — deformation
                2. Fuse
                3. Circuit opening relay (See page FI-69)
                4. Fuel pump (See page FI-44)
                5. Fuel filter
                6. Fuel pressure regulator (See page FI-52)

BAD ————————> Element — clean or replace

BAD ————————> ISC system
                (1) Wiring connection
                (2) ISC valve
                (3) ECU (test by substitution)

NO ————————> Adjust ignition timing

NO ————————> 1. Spark plug
               2. Compression pressure
                  Limit: 9.0 kgf/cm² (128 psi, 883 kPa)
                         at 250 rpm

BAD ————————> 1. Cold start injector
                2. Start injector time switch
                   (See page FI-71)