Page 1537 of 1807

SF0I7-01
P11993
Ohmmeter
+BHT Bank 1 Sensor 1
P11483
Ohmmeter
+BHT Bank 1 Sensor 2 SF-82
- SFI (2JZ-GTE)HEATED OXYGEN SENSOR
1408 Author: Date:
1997 SUPRA (RM502U)
INSPECTION
1. INSPECT HEATER RESISTANCE OF HEATED
OXYGEN SENSOR (BANK 1 SENSOR 1)
(a) Disconnect the oxygen sensor connector.
(b) Using an ohmmeter, measure the resistance between the
terminals +B and HT.
Resistance: 11 - 16 W at 20°C (68°F)
If the resistance is not as specified, replace the sensor.
Torque: 20 N´m (200 kgf´cm, 14 ft´lbf)
(c) Reconnect the oxygen sensor connector.
2. INSPECT HEATER RESISTANCE OF HEATED
OXYGEN SENSOR (BANK 1 SENSOR 2)
(a) Remove the driver's seat.
(b) Take out the console box side of the floor carpet.
(c) Disconnect the oxygen sensor connector.
(d) Using an ohmmeter, measure the resistance between the
terminals +B and HT.
Resistance: 11 - 16 W at 20°C (68°F)
If the resistance is not as specified, replace the sensor.
Torque: 20 N´m (200 kgf´cm, 14 ft´lbf)
(e) Reconnect the oxygen sensor connector.
(f) Reinstall the floor carpet.
(g) Reinstall the driver's seat.
Page 1538 of 1807
SF0I8-01
P20904
Fuel Pump ECU
Fuel Pump ECU
Connector
RH Deck Trim
Side Board
Rear Deck Trim CoverInner Quarter
Wheel Hose Cover
Stay Support Cover
Removal Roof Stay
Service Hole Cover
Floor Carpet
x4
x3
- SFI (2JZ-GTE)FUEL PUMP ECU
SF-83
1409 Author: Date:
1997 SUPRA (RM502U)
FUEL PUMP ECU
COMPONENTS
Page 1539 of 1807
SF0IA-01
Z16615
Floor Carpet
ECM Protector
ECM
ECM Connector
Scuff Plate
- SFI (2JZ-GTE)ENGINE CONTROL MODULE (ECM)
SF-85
1411 Author: Date:
1997 SUPRA (RM502U)
ENGINE CONTROL MODULE (ECM)
COMPONENTS
Page 1540 of 1807

SF0IB-01
P11983
P11985
Bolt
Z06725
(Before Connection) (After Connection)
Connector Bolt
Collar
Stopper
Less than 1 mmFemale
Nut
Male
Connector
P11986
Insert SF-86
- SFI (2JZ-GTE)ENGINE CONTROL MODULE (ECM)
1412 Author: Date:
1997 SUPRA (RM502U)
INSPECTION
1. DISCONNECT NEGATIVE (-) TERMINAL CABLE
FROM BATTERY
2. REMOVE SCUFF PLATE
3. REMOVE ECM PROTECTOR
(a) Take out the front side of the floor carpet.
(b) Remove the 2 nuts and ECM protector.
4. REMOVE ECM
(a) Remove the nut, and disconnect the ECM from the floor
panel.
(b) Fully loosen the bolt and disconnect the 2 ECM connec-
tors, and remove the ECM.
5. INSPECT ECM
(See page DI-164)
6. REINSTALL ECM
(a) Connect the 2 ECM connectors.
Match the male connector correctly with the female
connector, then press them together.
Tighten the bolt.
Make sure the connector is completely connected
by tightening the bolt until there is a clearance of
less than 1 mm (0.04 in.) between the bottom of the
male connector and the end of the female connec-
tor.
(b) Install the ECM with the nut.
7. REINSTALL ECM PROTECTOR
8. REINSTALL SCUFF PLATE
9. RECONNECT NEGATIVE (-) TERMINAL CABLE TO
BATTERY
Page 1541 of 1807
SF0IC-02
Q08242
TOYOTA Hand-Held Tester
DLC3
P11358Sound Scope
- SFI (2JZ-GTE)FUEL CUT RPM
SF-87
1413 Author: Date:
1997 SUPRA (RM502U)
FUEL CUT RPM
INSPECTION
1. WARM UP ENGINE
Allow the engine to warm up to normal operating temperature.
2. CONNECT TOYOTA HAND-HELD TESTER OR
OBDII SCAN TOOL
(a) Connect the TOYOTA hand-held tester or OBDII scan
tool to the DLC3.
(b) Please refer to the TOYOTA hand-held tester or
OBDII scan tool operator's manual for further details.
3. INSPECT FUEL CUTOFF OPERATION
(a) Increase the engine speed to at least 3,000 rpm.
(b) Check for injector operating noise.
(c) Check that when the throttle lever is released, injector op-
eration noise stops momentarily and then resumes.
HINT:
Measure with the A/C OFF.
Fuel return speed:
1,400 rpm
(Vehicle speed less than 25 km/h (16 mph), with brake
OFF)
4. DISCONNECT TOYOTA HAND-HELD TESTER OR
OBDII SCAN TOOL
Page 1542 of 1807

CH03L-01
P11586
Z18809
Except Maintenance-Free Battery
Z18810
Maintenance-Free BatteryVoltmeter
Z11580
Blue
OKWhite
Charging
NecessaryRed
Insufficient
Water Maintenance-Free Battery CH-2
- CHARGINGCHARGING SYSTEM
1525 Author: Date:
1997 SUPRA (RM502U)
ON-VEHICLE INSPECTION
1. CHECK BATTERY ELECTROLYTE LEVEL
Check the electrolyte quantity of each cell.
Maintenance-Free Battery:
If under the lower level, replace the battery (or add distilled wa-
ter if possible). Check the charging system.
Except Maintenance-Free Battery:
If under the lower level, add distilled water.
2. Except Maintenance-Free Battery:
CHECK BATTERY SPECIFIC GRAVITY
Check the specific gravity of each cell.
Standard specific gravity: 1.25 - 1.29 at 20°C (68°F)
If the specific gravity is less than specification, charge the bat-
tery.
3. Maintenance-Free Battery:
CHECK BATTERY POSITIVE VOLTAGE
(a) After having driven the vehicle and in the case that 20
minutes have not passed after having stopped the en-
gine, turn the ignition switch ON and turn on the electrical
system (headlight, blower motor, rear defogger etc.) for
60 seconds to remove the surface charge.
(b) Turn the ignition switch OFF and turn off the electrical sys-
tems.
(c) Measure the battery positive voltage between the nega-
tive (-) and positive (+) terminals of the battery.
Standard voltage: 12.5 - 12.9 V at 20°C (68°F)
If the voltage is less than specification, charge the battery.
HINT:
Check the indicator as shown in the illustration.
4. CHECK BATTERY TERMINALS AND FUSES
(a) Check that the battery terminals are not loose or cor-
roded.
If the terminals are corroded, clean the terminals.
(b) Check the fuses for continuity.
Page 1543 of 1807

Z05962
P11595
P11594
P10652
Type A
Type BAB
AB
Z05963
CORRECT WRONGWRONG
- CHARGINGCHARGING SYSTEM
CH-3
1526 Author: Date:
1997 SUPRA (RM502U)
5. INSPECT DRIVE BELT
HINT:
A belt tensioner is used, so checking the belt tension is not nec-
essary.
(a) Visually check the drive belt for excessive wear, frayed
cords, etc.
If necessary, replace the drive belt.
HINT:
Cracks on the rib side of a drive belt are considered ac-
ceptable. If the drive belt has chunks missing from the
ribs, it should be replaced.
The drive belt tension can be released by turning the belt
tensioner clockwise.
(b) Check the belt tensioner operation.
Check that the belt tensioner moves downward
when the drive belt is pressed down at the points in-
dicated in the illustration with approx. 98 N (10 kgf,
22.0 lbf) of force.
Check the alignment of the belt tensioner pulley to
make sure the drive belt will not slip off the pulley.
If necessary, replace the belt tensioner.
Check that the arrow mark on the belt tensioner falls
within area A of the scale.
If it is outside area A, replace the drive belt.
HINT:
When a new belt is installed, it should lie within area B. If
not, the drive belt is not correct.
After installing a drive belt, check that it fits properly in the
ribbed grooves.
Check by hand to confirm that the belt has not slipped out
of the groove on the bottom of the pulley.
Page 1544 of 1807

Z03473
Disconnect Wire
from Terminal B Ammeter
Battery
Generator
Voltmeter
P10822Terminal F CH-4
- CHARGINGCHARGING SYSTEM
1527 Author: Date:
1997 SUPRA (RM502U)
6. REMOVE ENGINE UNDER COVER
7. VISUALLY CHECK GENERATOR WIRING AND
LISTEN FOR ABNORMAL NOISES
(a) Check that the wiring is in good condition.
(b) Check that there is no abnormal noise from the generator
while the engine is running.
8. CHECK CHARGE WARNING LIGHT CIRCUIT
(a) Warm up the engine and then turn it off.
(b) Turn off all accessories.
(c) Turn the ignition switch ºONº. Check that the charge warn-
ing light is lit.
(d) Start the engine. Check that the light goes off.
If the light does not go off as specified, troubleshoot the charge
light circuit.
9. INSPECT CHARGING CIRCUIT WITHOUT LOAD
HINT:
If a battery/generator tester is available, connect the tester to
the charging circuit as per manufacturer's instructions.
(a) If a tester is not available, connect a voltmeter and amme-
ter to the charging circuit as follows:
Disconnect the wire from terminal B of the genera-
tor, and connect it to the negative (-) probe of the
ammeter.
Connect the positive (+) probe of the ammeter to
terminal B of the generator.
Connect the positive (+) probe of the voltmeter to
terminal B of the generator.
Ground the negative (-) probe of the voltmeter.
(b) Check the charging circuit as follows:
With the engine running from idling to 2,000 rpm, check
the reading on the ammeter and voltmeter.
Standard amperage: 10 A or less
Standard voltage: 13.2 - 14.8 V
If the voltmeter reading is more than standard voltage, replace
the voltage regulator.
If the voltmeter reading is less than standard voltage, check the
voltage regulator and generator as follows:
With terminal F grounded, start the engine and
check the voltmeter reading of terminal B.
If the voltmeter reading is more than standard volt-
age, replace the voltage regulator.
If the voltmeter reading is less than standard volt-
age, check the generator.