Toyota Supra 1990 Manual page 188

FI-14
EFI SYSTEM - Troubleshooting
SYMPTOM - ENGINE OFTEN STALLS
CHECK DIAGNOSIS SYSTEM
Malfunction
Diagnostic code(s) (See page FI-26)
Check for output of diagnostic code
code(s)
(See page FI-23)
1
Norma I code
CHECK FOR VACUUM LEAKS IN
BAD
1. Oil filler cap
AIR INTAKE LINE
2. Oil dipstick
3. Hose connections
4. PCV hose
1
OK
CHECK FUEL SUPPLY TO INJECTOR
BAD
1. Fuel line - leakage - deformation
1. Fuel in tank
2. Fuse
2. Fuel pressure in fuel line
3. Fuel pump (See page F 1-70)
(1) Connect terminals Fp and +B of
4. Fuel filter
the check connector.
5. Fuel pressure regulator (See page FI-81)
(2) You can feel fuel pressure in fuel
return hose. (See page FI-71)
6. Circuit opening relay (See page FI-110)
3. Check circuit opening relay
(See page FI-110)
i
OK
CHECK AIR FILTER ELEMENT
BAD
I
Element - Clean or replace
I
!
OK
CHECK IDLE SPEED
BAD
ISC system
STD:
7M-GE
700 rpm
(1) Wiring connection
7M-GTE 650 rpm
(2) ISC valve
(3) ECU (test by substitution)
1
OK
CHECK IGNITION TIMING
NO
Adjust ignition timing (See page IG-20)
1. Connect terminals TE
1
and E
1
of
the check connector.
2. Check ignition timing.
STD: 10° BTDC
@
idle
[w/ connect terminals TEl and El]
1
OK
CHECK SPARK PLUGS
BAD
1. Spark plugs
Plug gap: 7M-GE
1.1 mm (0.043 in.)
2. Compression pressure
7M-GTE 0.8 mm (0.031 in.)
Minimum: 9.0 kg/cm
2
(128 psi, 883 kPa)
- HINT-
at 250 rpm
Check compression pressure and valve
3. Valve clearance
clearance if necessary.
Standard: IN 0.15 - 0.25 mm
(0.006 - 0.010 in.)
EX 0.20 - 0.30 mm
(0.008 - 0.012 in.)
1
OK
CONTINUED ON PAGE FI·15