Toyota Supra 1990 Manual page 189

EFI SYSTEM - Troubleshooting FI-15
~
OK CONTINUED FROM PAGE FI-14
CHECK COLD START INJECTOR
BAD
1. Cold start injector
(See page FI-77)
2. Cold start injector time switch
(See page FI-112)
1
0K
CHECK FUEL PRESSURE
BAD
1. Fuel pump (See page F 1-70)
(See page FI-71)
2. Fuel filter
3. Fuel pressure regulator
(See page FI-81)
1
OK
CHECK INJECTORS
BAD
I njection condition
(See page F 1-83)
1
OK
CHECK EFI ELECTRONIC CIRCUIT
BAD
1. Wiring connection
USING VOLT/OHMMETER
2. Power to ECU
(See pages F 1-30,49)
(1) Fusible links
(2) Fuses
(3) EF I main relay
3. Air flow meter
4. Water temp. sensor
5. Air temp. sensor
6. I njection signal circuit
(1)
I njector wiring
(2) Resistor (7M-GTE)
(3) ECU
SYMPTOM - ENGINE SOMETIMES STALLS
CHECK DIAGNOSIS SYSTEM
Malfunction
Diagnostic code(s) (See page F 1-26)
Check for output of diagnostic code.
code(s)
(See page F 1-23)
Normal code
CHECK AIR FLOW METER
BAD
Air flow meter
(See pages FI-94, 96)
OK
CHECK WIRING CONNECTORS AND
BAD
1. Connector
RELAYS
2. EF I main relay (See page F 1-109)
Check for a signal change when the connec- 3. Circuit opening relay (See page FI-110)
tor or relay is slightly tapped or wiggled.