Power Supply Troubleshooting - Toyota 8FGU15 Repair Manual

8 TROUBLESHOOTING
Phenomenon on
Control type
vehicle
The power does not
turn on even when
operating the ignition
Power supply switch. (The meter
or display does not
light up, and the en-
gine does not run.)
Malfunction area
Checking method
and mode
Battery voltage
check:
▪ Battery:
Ignition switch OFF:
Low voltage
Check the battery
voltage.
Check the har-
▪ Power harness:
nesses, connectors
Wire breakage, and fuses on the
short circuit or power line between
leakage the battery and the
controller while re-
(Harness, con-
ferring to the system
nector, fuse)
circuits diagram.
▪ Ignition switch
main body:
Check the har-
Open failure
nesses, connector
▪ Ignition switch and fuse between
harness: the ignition switch
and the controller
Wire breakage,
while referring to the
short circuit or
system circuits dia-
leakage
gram.
(Harness, con-
nector, fuse)
▪ Power shut-off
relay main body
(only for models
with "MULTI-
FUNCTION DIS-
PLAY DX"):
Open failure
▪ Power shut-off
relay harness
-
(only for models
with "MULTI-
FUNCTION DIS-
PLAY DX"):
Wire breakage,
short circuit or
leakage
(Harness, con-
nector)
▪ SAS/OPS con-
troller:
-
Internal damage
8-187
Corrective action
Charge or replace
the battery.
Check the har-
nesses, and repaire
or replace them.
Replace the fuses.
Check and replace
the switch.
Check the har-
nesses, and repaire
or replace them.
Replace the fuses.
Check and replace
the relay.
Check the har-
nesses, and repair
or replace them.
Replace the control-
ler.
8