1995 TOYOTA SUPRA fuse chart

INSPECTION PROCEDURE
Check ECU±B fuse.
Remove ECU±B fuse from R/B No.2.
Check continuity of ECU±B fuse.
Continuity
Check for short in all the harness and components
connected to the ECU±B fuse (See attached wiring
diagram).
Remove ECU with connectors still connected.
Voltage: 10 ± 14 V
Check continuity between terminal BATT of ECU connector and body
ground.
Measure voltage between terminal BATT of ECU con-
nector and body ground.
Proceed to next circuit inspection shown on matrix
chart (See page
BE±170).
Check and repair harness and connector
between battery and ECU. BE±196
± BODY ELECTRICAL SYSTEMCRUISE CONTROL SYSTEM

ELECTRONIC CONTROL SYSTEM
TROUBLESHOOTING FLOW±CHART
Trouble Symptom
wHard steering at idle or low±speed driving.
wSteering too sensitive during high±speed driving.
Preliminary Check
wCheck tire pressure.
wCheck lubrication of suspension and steering linkage.
wCheck front wheel alignment.
wCheck steering system joint and suspension arm ball joint.
wCheck for bent steering column.
wCheck that all connectors are secure.
wCheck PS pump fluid pressure. (See page SR±37)
Turn ignition switch on.
Is ECU±IG fuse normal?
Disconnect the ECU connector.
Fuse faulty.
Replace fuse.
Is operation normal?Short circuit in wire
harness between fuse
and ECU terminal +B.
Check 1.
Check that there is battery voltage (10 Ð 14V) between the
ECU terminal +B and body ground.
Open circuit in wire harness between the fuse and ECU terminal +B.
± STEERINGELECTRONIC CONTROL SYSTEMSR±47

INSPECTION PROCEDURE
Check EFI No.1 Fuse.
Remove EFI No.1 fuse from R/B No.2.
Check continuity of EFI No.1 fuse.
Continuity
Check for short in the harness and all the com-
ponents connected to EFI No.1 fuse (See Electri-
cal Wiring Diagram).
Connect SST (check harness ªAº).
(See page EG±404)
SST 09990±01000
Measure voltage between terminal BATT of en-
gine control module connector and body ground.
Voltage: 9 Ð 14 V
Check and replace engine control module.
Check and repair harness or connector between
engine control module and EFI No.1 fuse, EFI No.1
fuse and battery.
Proceed to next circuit inspection shown on matrix
chart (See page
EG±408).
Check voltage between terminal BATT of engine control module connector
and body ground.
Are the diagnostic trouble codes still in the memory when the ignition switch
is turned OFF?
± ENGINE2JZ±GE ENGINE TROUBLESHOOTINGEG±471

INSPECTION PROCEDURE
(See page EG±510)
Check and repair harness or connector between
engine control module and EFI No.1 fuse, EFI No.1
fuse and battery.
Remove EFI No.1 fuse from R/B No.2.
Check continuity of EFI No.1 fuse.
Continuity
Check EFI No.1 Fuse.
Check voltage between terminal BATT of engine control module connector
and body ground.
Connect SST (check harness ªAº).
See page EG±510)
SST 09990±01000
Measure voltage between terminal BATT of en-
gine control module connector and body ground.
Voltage: 9 Ð 14 V
Check for short in the harness and all the compo-
nents connected to EFI No.1 fuse (See attached
wiring diagram).
Are the diagnostic trouble codes still in the memory when the ignition switch
is turned OFF?
Check and replace engine control module.
Proceed to next circuit inspection shown on matrix
chart (See page EG±514).
EG±582± ENGINE2JZ±GTE ENGINE TROUBLESHOOTING