Toyota Land Cruiser 1988 Repair Manual page 157

Fl-26
EFI SYSTEM - Diagnosis System
1.
2.
Battery
INSPECTION OF DIAGNOSIS CIRCUIT
ECU
r-----------------------~BATT
. - - - - - - c +
B 1
r--cJII;;::::::,::>-----<J'.......,o---<i----+-0""""'
<>-it---.__-----<> +
B
Fusible Link
Fuse
r---~~~~~~---------oM-REL
,__ _ __,"CHECK Engine
Warning Light
MAIN 0.85R EFI 15A
Ignition Switch
AM1 IG1
0.5G
Fuse
01 ~1G~2~--~G~A 9 U~G~E~7~.5~A--~~~~-------6W
~~~~----~a- 01--------~~c--------------¢1GS/W
0.5G IGN 7.5A
AM2
Check
Connector
'----+-__,E1
Does "CHECK" engine warning light come on
YES
System Normal
when ignition switch is at ON?
NO
Fl2435
Does "CHECK" engine warning light come on
YES
Check wiring between
OK Try another
when ECU terminal W is grounded to the body? ECU terminal E1 and
ECU.
body ground.
NO
!
BAD
Check bulb, fuse and wiring between ECU and
Repair or replace.
ignition switch.
BAD
Repair or replace.j
Does "CHECK" engine warning light go off
YES
System Normal
when the engine is started?
~NO
BAD
Check wiring between ECU and "CHECK"
Repair.
engine warning light.
!
OK
Is there diagnostic code output when check
NO Check wiring between ECU terminal T and
connector terminals TE1 and E1 and short check connector terminal TE1, and ECU
circuited?
terminal E1 and check connector terminal E1.
~YES
NO
~OK
Does "CHECK" engine warning light go out
Try another
after repair according to malfunction code?
Further repair required.
ECU.
~YES
System OK
I
Cancel out diagnostic code.