Toyota Land Cruiser 1988 Repair Manual page 147

Fl-16
EFI SYSTEM - Troubleshooting
SYMPTOM- HIGH ENGINE IDLE SPEED (NO DROP)
CHECK ACCELERATOR LINKAGE Linkage - Stuck
~OK
BAD
CHECK AIR CONDITIONER IDLE-UP ISC valve
CIRCUIT
BAD
t
OK
CHECK DIAGNOSIS SYSTEM Diagnostic code(s) (See pages Fl-24, 25)
Check for output of diagnostic code. Malfunction
(See page Fl-21) code(s)
!
Normal code
CHECK ISC SYSTEM 1. Wiring connections
BAD 2. ISC valve (See page Fl-71)
3. Air conditioner switch
!
OK
CHECK THROTTLE POSITION Throttle body
SENSOR (See page Fl-68) BAD
l
OK
CHECK FUEL PRESSURE Fuel pressure regulator- High pressure
(See page Fl-47)
BAD
JoK
CHECK COLD START INJECTOR Cold start injector - linkage
(See page Fl-52) BAD
!
OK
CHECK INJECTORS (See page Fl-57) Injectors- Leakage, Injection quantity
I
!
OK
BAD
CHECK EFI ELECTRONIC CIRCUIT 1. Wiring connection
USING VOLT /OHMMETER BAD 2. Power to ECU
(See page FJ-27) (1) Fusible links
(2) Fuses
(3) EFI main relay (See page Fl-74)
3. Air flow meter (See page Fl-66)
4. Water temp. sensor (See page FJ-77)
5. Air temp. sensor (See page Fl-66)
6. Injection signal circuit
(1) Injector wiring
(2) ECU (See page Fl-82)