1997 TOYOTA SUPRA spark plugs

17
E GLOSSARY OF TERMS AND SYMBOLS
METER, ANALOG
Current flow activates a magnetic
coil which causes a needle to
move, thereby providing a relative
display against a background
calibration. LED (LIGHT EMITTING DIODE)
Upon current flow, these diodes
emit light without producing the
heat of a comparable light. IGNITION COIL
Convert low-voltage DC current
into high-voltage ingition current
for firing the spark plugs.
1. SINGLE
FILAMENT
GROUND
The point at which wiring attaches
to the Body, thereby providing a
return path for an electrical circuit;
without a ground, current cannot
flow.
Current flow causes a headlight
filament to heat up and emit light.
A headlight may have either a
single (1) filament or a double (2)
filament. BATTERY
Stores chemical energy and
converts it into electrical energy.
Provides DC current for the
auto's various electrical circuits.
CAPACITOR (Condenser)
A small holding unit for temporary
storage of electrical voltage.
CIRCUIT BREAKER
Basically a reusable fuse, a circuit
breaker will heat and open if too
much current flows through it.
Some units automatically reset when
cool, others must be manually reset.
DIODE
A semiconductor which allows
current flow in only one direction.
DIODE, ZENER
A diode which allows current
flow in one direction but blocks
reverse flow only up to a specific
voltage. Above that potential, it
passes the excess voltage.
This acts as a simple voltage
regulator.
PHOTODIODE
The photodiode is a
semiconductor which controls the
current flow according to the
amount of light.
FUSE
A thin metal strip which burns
through when too much current
flows through it, thereby stop-
ping current flow and protecting a
circuit from damage.
FUSIBLE LINK
A heavy-gauge wire placed in
high amperage circuits which
burns through on overloads,
thereby protecting the circuit.
The numbers indicate the cross-
section surface area of the wires.HORN
An electric device which sounds a
loud audible signal.
LIGHT
Current flow through a filament
causes the filament to heat up
and emit light.
METER, DIGITAL
Current flow activates one or
many LED's, LCD's, or fluoresent
displays, which provide a relative
or digital display.
MOTOR
A power unit which converts
electrical energy into mechanical
energy, especially rotary motion. CIGARETTE LIGHTER
An electric resistance heating
element.
DISTRIBUTOR, IIA
Channels high-voltage current
from the ignition coil to the
individual spark plugs.
2. DOUBLE
FILAMENT
HEADLIGHTS
FUEL
M
(for High Current Fuse or
Fusible Link.)
(for Medium Current Fuse)

P02421
P11777
Seal Packing
P12290
Engine wire Bracket
- ENGINE MECHANICAL (2JZ-GTE)CYLINDER HEAD
EM-51
1156 Author
: Date
:
1997 SUPRA (RM502U)
(c) Hold the hexagon portion of the camshaft with a wrench,
and tighten the timing pulley bolt.
Torque: 81 N´m (810 kgf´cm, 60 ft´lbf)
7. INSTALL NO.1 AND NO.2 CYLINDER HEAD
COVERS
(a) Remove any old packing (FIPG) material.
(b) Apply seal packing to the cylinder head as shown in the
illustration.
Seal packing: Part No. 08826-00080 or equivalent
(c) Install the gaskets to the No.1 and No.2 cylinder head
covers.
(d) Install the seal washers to the mounting bolts.
(e) Install the No.1 cylinder head cover with the 4 seal wash-
ers and 4 bolts.
Torque: 5.5 N´m (55 kgf´cm, 49 in.´lbf)
(f) Install the No.2 cylinder head cover with the 4 seal wash-
ers and 4 bolts.
Torque: 5.5 N´m (55 kgf´cm, 49 in.´lbf)
(g) Install the PCV valve.
(h) Install the cruise control actuator cable bracket and IAC
valve pipe clamp with the 2 bolts.
8. INSTALL SPARK PLUGS
9. INSTALL IGNITION COILS ASSEMBLIES
(See page IG-7)
10. INSTALL TIMING BELT (See page EM-21)
11. INSTALL INTAKE MANIFOLD AND DELIVERY PIPE
ASSEMBLY
Install a new gasket, the intake manifold, delivery pipe assem-
bly and engine wire bracket with the 4 bolts and 2 nuts.
Torque: 27 N´m (280 kgf´cm, 20 ft´lbf)

EM0A8-02
P12302Compression Tester
- ENGINE MECHANICAL (2JZ-GTE)COMPRESSION
EM-3
1108 Author
: Date
:
1997 SUPRA (RM502U)
COMPRESSION
INSPECTION
HINT:
If there is lack of power, excessive oil consumption or poor fuel
economy, measure the compression pressure.
1. WARM UP AND STOP ENGINE
Allow the engine to warm up to normal operating temperature.
2. DISCONNECT CAMSHAFT POSITION SENSOR
CONNECTORS
3. REMOVE IGNITION COILS ASSEMBLIES
(See page IG-6)
4. REMOVE SPARK PLUGS
5. CHECK CYLINDER COMPRESSION
(a) Insert a compression tester into the spark plug hole.
(b) While cranking the engine, measure the compression
pressure.
HINT:
Always use a fully charged battery to obtain engine revolutions
of 250 rpm or more.
(c) Repeat steps (a) through (b) for each cylinder.
NOTICE:
This measurement must be done in as short a time as pos-
sible.
Standard pressure:
1,079 kPa (11.0 kgf/cm
2, 156 psi) or more
Minimum pressure:
883 kPa (9.0 kgf/cm
2, 128 psi)
Difference between each cylinder:
98 kPa (1.0 kgf/cm
2, 14 psi) or less
(d) If the cylinder compression in 1 or more cylinders is low,
pour a small amount of engine oil into the cylinder through
the spark plug hole and repeat steps (a) through (b) for
the cylinder with low compression.

If adding oil helps the compression, it is likely that
the piston rings and/or cylinder bore are probably
worn or damaged.

If pressure stays low, a valve may be sticking or
seating improper, or there may be leakage past the
gasket.
6. REINSTALL SPARK PLUGS
7. REINSTALL IGNITION COILS ASSEMBLIES
(See page IG-7)
8. RECONNECT CAMSHAFT POSITION SENSOR
CONNECTORS

P12646
Z16792
IAC Valve Pipe Clamp
PCV Valve Cruise
Control
Actuator
Cable
Bracket
No.2
No.1
P04466
A02174
- ENGINE MECHANICAL (2JZ-GTE)CYLINDER HEAD
EM-31
1136 Author
: Date
:
1997 SUPRA (RM502U)
14. REMOVE TIMING BELT FROM CAMSHAFT TIMING
PULLEYS (See page EM-15)
NOTICE:

Support the timing belt, so that the meshing of the
crankshaft timing pulley and timing belt does not
shift.

Be careful not to drop anything inside the timing belt
cover.

Do not allow the timing belt to come into contact with
oil, water or dust.
15. REMOVE IGNITION COILS ASSEMBLIES
(See page IG-6)
16. REMOVE SPARK PLUGS
17. REMOVE NO.1 AND NO.2 CYLINDER HEAD
COVERS
(a) Remove the 2 bolts, cruise control actuator cable bracket
and IAC valve pipe clamp.
(b) Remove the PCV valve.
(c) Remove the 6 bolts, 2 nuts, 8 seal washers and No.1 cyl-
inder head cover and gasket.
(d) Remove the 6 bolts, 2 nuts, 8 seal washers and No.2 cyl-
inder head cover and gasket.
18. REMOVE CAMSHAFT TIMING PULLEYS
Hold the hexagon portion of the camshaft with a wrench, and
remove the pulley mounting bolt and camshaft pulley.
19. REMOVE NO.4 TIMING BELT COVER
Remove the 4 bolts and timing belt cover.

IG0147
Megger
Ground
N00917
Z00032
1.1mm IG-2
- IGNITION (2JZ-GTE)IGNITION SYSTEM
1496 Author
: Date
:
1997 SUPRA (RM502U)
2. INSPECT SPARK PLUGS
NOTICE:

Never use a wire brush for cleaning.

Never attempt to adjust the electrode gap on used a
spark plug.

Spark plugs should be replaced every 100,000 km
(60,000 miles).
(a) Remove the ignition coils assemblies.
(See page IG-6)
(b) Inspect the electrode.
Using a megger (insulation resistance meter), measure
the insulation resistance.
Standard correct insulation resistance:
10 MW or more
If the resistance is less than specified, proceed to step (c).
HINT:
If a megger is not available, the following simple method of in-
spection provides fairly accurate results.
Simple Method:

Quickly race the engine 5 times to 4,000 rpm.

Remove the spark plug.

Visually check the spark plug.
If the electrode is dry ... OK
If the electrode is wet ... Proceed to step (d).

Reinstall the spark plug.
(c) Using a 16 mm plug wrench, remove the 6 spark plugs.
(d) Visually check the spark plug for thread damage and insu-
lator damage.
If abnormal, replace the spark plug.
Recommended spark plug:
DENSO madePK20R11
NGK madeBKR6EP11
(e) Inspect the electrode gap.
Maximum electrode gap for used spark plug:
1.3 mm (0.051 in.)
If the gap is greater than maximum, replace the spark plug.
Correct electrode gap for new spark plug:
1.1 mm (0.043 in.)
NOTICE:
If adjusting the gap of a new spark plug, bend only the base
of the ground electrode. Do not touch the tip. Never attempt
to adjust the gap on the used plug.

IG0152
P11795
Ohmmeter
P12177
Ohmmeter
- IGNITION (2JZ-GTE)IGNITION SYSTEM
IG-3
1497 Author
: Date
:
1997 SUPRA (RM502U)
(f) Clean the spark plugs.
If the electrode has traces of wet carbon, allow it to dry and then
clean with a spark plug cleaner.
Air pressure: Below 588 kPa (6 kgf/cm
2, 85 psi)
Duration: 20 seconds or less
HINT:
If there are traces of oil, remove it with gasoline before using the
spark plug cleaner.
(g) Using a 16 mm plug wrench, reinstall the 6 spark plugs.
Torque: 18 N´m (180 kgf´cm, 13 ft´lbf)
(h) Reinstall the ignition coils assemblies.
(See page IG-7)
3. INSPECT IGNITION COILS
(a) Remove the No.3 timing belt cover.
(b) Disconnect the ignition coil connectors.
(c) Using an ohmmeter, measure the resistance between the
terminals.
Primary coil resistance:
Cold0.54 - 0.84 W
Hot0.68 - 0.98 W
If the resistance is not as specified, replace the ignition coil.
(d) Reconnect the ignition coil connectors.
(e) Reinstall the No.3 timing belt cover.
4. INSPECT CAMSHAFT POSITION SENSORS
(a) Disconnect the camshaft position sensor connectors.
(b) Using an ohmmeter, measure the resistance between ter-
minals.
Resistance:
Cold835 - 1,400 W
Hot1,060 - 1,645 W
If the resistance is not as specified, replace the camshaft posi-
tion sensor.

MA0688
MA01G-01
- MAINTENANCEENGINE
MA-5
42 Author
: Date
:
1997 SUPRA (RM502U)
ENGINE
INSPECTION
1. REPLACE TIMING BELT
(2JZ-GE: See page EM-17)
(2JZ-GTE: See page EM-19)
2. INSPECT DRIVE BELT
(See page CH-2)
3. REPLACE SPARK PLUGS
(2JZ-GE: See page IG-1)
(2JZ-GTE: See page IG-1)
4. INSPECT AIR FILTER
(a) Remove the air filter.
(b) Visually check that the air filter is not excessively dam-
aged or oily.
If necessary, replace the air filter.
(c) Clean the filter with compressed air.
First blow from the inside thoroughly, then blow off the
outside of the filter.
(d) Reinstall the air filter and air cleaner case.
5. REPLACE AIR FILTER
Replace the air filter with a new one.
6. REPLACE ENGINE OIL AND OIL FILTER
(See page LU-4)
7. REPLACE ENGINE COOLANT
(See page CO-2)
8. INSPECT CHARCOAL CANISTER
(2JZ-GE: See page EC-5)
(2JZ-GTE: See page EC-5)
9. REPLACE GASKET IN FUEL TANK CAP
(2JZ-GE: See page EC-5)
(2JZ-GTE: See page EC-5)
10. INSPECT FUEL LINES AND CONNECTIONS
(2JZ-GE: See page SF-32)
(2JZ-GTE: See page SF-34)
11. INSPECT EXHAUST PIPES AND MOUNTINGS
Visually check the pipes, hangers and connections for severe
corrosion, leaks or damages.
12. ADJUST VALVE CLEARANCE
(2JZ-GE: See page EM-4)
(2JZ-GTE: See page EM-4)