Toyota 4-Runner 1985 Repair Manual page 195

FI-26
EFI SYSTEM - Diagnosis System
1.
2.
INSPECTION OF DIAGNOSIS CIRCUIT
Fusible link
Fusible Link
T
I
Battery
I
I
..L
I
Fuse EFI (15A)
IG
Ign ition Switch
Does CHECK ENG. light come on when ignition
switch is at ON?
+
NO
Does CHECK ENG. light come on when ECU terminal
W is grounded to the body?
~NO
"CHECK ENGINE"
Warning light
YES
System Normal
YES Check wiring between ECU
terminal El and body ground.
1BAD
Check bulb, fuse and wiring between ECU and ignition
Repair or replace
switch .
• BAD
Repair or replace
Does CHECK ENG. light go OFF when
YES
System Normal
engine is started?
-
~NO
Check wiring between ECU and CHECK ENG. light.
BAD
Repair
1
t
OK
Is there diagnosis code output when CHECK ENG.
NO 1
Try another ECU.
I
connector
T -E,
is short circuited?
~YES
Does CHECK ENG. light go out after repair
NO
\
according to malfunction code?
Further repair required.
.YES
System OK
NO
Cancel out diagnostic cOdej
I
OK
FIOOO7
Try another
I
ECU.