Toyota Celica Supra 1986 Service And Repair Manual page 620

BE-72 BODY ELECTRICAL SYSTEM - Cruise Control System
A
INSPECTION OF SOURCE CIRCUIT
J
Turn ignition switch on.
J
No No
Is ECU fuse normal ?
Replace fuse.
• Short circuit in wire
Is operation normal ?
harness between fuse and
Yes
terminal 3 of main switcl1.
Yes
• Inspect control switch.
M
I
l
Fuse faulty.j
l
AIN
~{J!
INSPECT POWER SOURCE
No
Open circuit in wire harness between fuse
Is there battery voltage between terminal 1
and terminal 1 of main switch.
of main switch and body ground
?
Yes
INSPECT GROUND CONNECTION
• Open circuit in wire harness between
Disconnect connector from main switch.
No
terminal 5 of main switch and body
Is there continuity between terminal 5 of
ground.
wire harness side connector and body ground
?
• Body ground faul ty.
Yes
INSPECT SWITCH OPERATION
No
Inspect main switch.
'•
Is there battery voltage between terminal 3
and body ground with main switch tum on
? "
Yes
c
ONTROL S/W
INSPECT GROUND CONNECTION
Open circuit in wire harness between terminal .
Disconnect connector from control switch.
No
14 of control sw itch and body ground.
Is there continuity between terminal 14 of
wire harness side connector and body ground?
Yes
INSPECT SET/COAST SWITCH OPERATION
No
Inspect control switch.
Is there con tinuity between terminal 30 and
body ground with set/coast switch t urned on ?
Yes
CONTINUED ON NEXT PAGE