spark plug TOYOTA SUPRA 1997 Service Repair Manual

P11446Fuel Inlet Hose
P11799
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-155
383 Author
: Date
:
1997 SUPRA (RM502U)
7 Check fuel pressure.
PREPARATION:
(a) Be sure that enough fuel is in the tank.
(b) Turn ignition switch ON.
(c) Connect the TOYOTA hand-held tester to DLC3 on the
vehicle.
(d) Use ACTIVE TEST mode to operate the fuel pump.
(e) If you have no TOYOTA hand-held tester, connect the
positive (+) and negative (-) leads from the battery to the
fuel pump connector (See page SF-5).
CHECK:
Check for fuel pressure in the fuel inlet hose when it is pinched
off.
HINT:
At this time, you will hear the sound of flowing.
NG Proceed to page SF-5 and continue
totroubleshoot.
OK
8 Check for spark.
PREPARATION:
(a) Remove ignition coil (See page IG-6).
(b) Remove spark plug.
(c) Install the spark plug to the ignition coil, and connect the
ignition coil connector.
(d) Ground the spark plug.
CHECK:
Check if spark occurs while the engine is being cranked.
NOTICE:
To prevent excess fuel being injected from the injectors
during this test, don't crank the engine for more than 5 ~ 10
sec. at a time.
NG Proceed to page IG-1 and continue to
troubleshoot.
OK
Proceed to matrix chart of problem systems
on page DI-169.

P11799 IG0317 IG0151
A03065
1.1 mm
DI-206
- DIAGNOSTICSENGINE (2JZ-GTE)
434 Author
: Date
:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1 Check spark plug and spark of misfiring cylinder.
PREPARATION:
(a) Remove the ignition coil (See page IG-6).
(b) Remove the spark plug.
CHECK:
(a) Check the carbon deposits on electrode.
(b) Check electrode gap.
OK:
(1) No large carbon deposit present.
Not wet with gasoline or oil.
(2) Electrode gap: 1.1 - 1.3 mm
(0.043 - 0.051 in.)
PREPARATION:
(a) Install the spark plug to the ignition coil, and connect the
ignition coil connector.
(b) Ground the spark plug.
(c) Disconnect injector connector.
CHECK:
Check if spark occurs while the engine is being cranked.
NOTICE:
To prevent excess fuel being injected from the injectors
during this test, don't crank the engine for more than 5 - 10
sec. at a time.
OK:
Spark jumps across electrode gap.
NG Replace or check ignition system (See page
IG-1).
OK

S03235
Battery
B
R/B
No.22
2A
AM2
W-R W-R
IB147 6
Igniter
Switch
B-O
IJ11B-OB-OB-O B-O B-O
B-O
B-O
B-O
B-O
B-O
B-O
Spark Plug
Ignition Coil No.1
L-YG
Y
Y-B
Y-G
Y-R No.2
No.3
No.4
No.5
No.6 112
1
1
1
1
12
2
2
2
2
2
1
Noise Filter
BRECM
BR
EC
I24Igniter Tr
2
I22
6
5
4
10
11
12
I3 B
B
B
B
B
B
B
1
2
3
9
8
7
357
56
55
54
53
52
58
IGF5V IGT6 IGT5 IGT4IGT3 IGT2 IGT1
Tr1
5V
I3
I3
I3
I3
I3
I2 I3I3 I3 I3 I3I3
R-W
W-R
LG
B-R
L
R
R-Y DI-252
- DIAGNOSTICSENGINE (2JZ-GTE)
480 Author
: Date
:
1997 SUPRA (RM502U)
DTC P1300 Igniter Circuit Malfunction
CIRCUIT DESCRIPTION
The ECM determines the ignition timing, turns on Tr1 at a predetermined angle (°CA) before the desired
ignition timing and outputs an ignition signal (IGT) º1º to the igniter.
Since the width of the IGT signal is constant, the dwell angle control circuit in the igniter determines the time
the control circuit starts primary current flow to the ignition coil based on the engine rpm and ignition timing
one revolution ago, that is, the time the Tr2 turns on.
When it reaches the ignition timing, the ECM turns Tr1 off and outputs the IGT signal º0º.
This turns Tr2 off, interrupting the primary current flow and generating a high voltage in the secondary coil
which causes the spark plug to spark. Also, by the counter electromotive force generated when the primary
current is interrupted, the igniter sends an ignition confirmation signal (IGF) to the ECM.
The ECM stops fuel injection as a fail safe function when the IGF signal is not input to the ECM.
DTC No.DTC Detecting ConditionTrouble Area
P1300No IGF signal to ECM for 6 consecutive IGT signals during
engine running
Open or short in IGF or IGT circuit from igniter to ECM

Igniter

ECM
WIRING DIAGRAM
DI4TC-01

A00720
ONCheck Harness A
ECM
B58
IGF(+)
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-253
481 Author
: Date
:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1 Check spark plug and spark of misfiring cylinder (See page DI-204).
NG Go to step 4.
OK
2 Check for open and short in harness and connector in IGF signal circuit between
ECM and igniter (See page IN-28).
NG Repair or replace harness or connector.
OK
3 Disconnect igniter connector and check voltage between terminal IGF of ECM
connector and body ground.
PREPARATION:
(a) Connect Check Harness A (See page DI-164).
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminal IGF of ECM connector and
body ground.
OK:
Voltage: 4.5 - 5.5 V
OK Replace igniter.
NG
Check and replace ECM (See page IN-28).

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)

S00587
Non-reusable part Cruise Control Actuator
Cable Bracket
No.2 Cylinder Head Cover
No.1 Cylinder Head Coverx 6
x 6
IAC Valve Pipe Clamp
PCV Valve
Camshaft Bearing Cap x 14Exhaust Camshaft
Intake Camshaft

Oil Seal
No.4 Timing Belt Cover
Camshaft Timing Pulley
Heater Water HoseAdjusting Shim
Valve Lifter
Keeper
Spring Retainer
Valve Spring
Spring Seat

O-Ring

Valve Guide
Bushing
Valve
Heater Union
EGR Cooler
Ground Strap
Gasket Spark Plug
Front Engine Hanger
Cylinder Head
Water Bypass Hose
x 8
x 14
Gasket
Gasket

Cylinder Head Gasket
Rear Engine Hanger
Camshaft Position Sensor
EM-28
- ENGINE MECHANICAL (2JZ-GTE)CYLINDER HEAD
1133 Author
: Date
:
1997 SUPRA (RM502U)

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.

IG04X-02
CHECK POWER SUPPLY TO IGNITION COIL AND
IGNITER
SPARK TEST
Replace camshaft position sensor.
CHECK RESISTANCE OF IGNITION COIL (See step 3)
1. Turn ignition switch to ON.
2. Check that there is battery positive voltage at ignition coil positive
CHECK CONNECTION OF IGNITION COIL AND IGNITER
Resistance: Cold Hot
Primary 0.68 - 0.98 W
CHECK RESISTANCE OF CAMSHAFT POSITION
Resistance:
ColdHot
835 - 1,400 W1,060 - 1,645 W
CHECK IGT SIGNAL FROM ECM
(See page DI-252)
TRY ANOTHER IGNITER
Replace ignition coil. Connect securely.
Check wiring between ignition switch
to ignition coil and igniter.
Check wiring between ECM and igniter,
and then try another ECM.
NO
OK
OK
OK
OKBAD
BAD
BAD
BAD
BAD
SENSOR (See step 4)0.54 - 0.84 W
(+) terminal.
CHECK RESISTANCE OF CRANKSHAFT POSITION
Resistance:Cold Hot
1,630 - 2,740 W2,065 - 3,225 W SENSOR (See step 5)
BADReplace crankshaft position sensor. OK
- IGNITION (2JZ-GTE)IGNITION SYSTEM
IG-1
1495 Author
: Date
:
1997 SUPRA (RM502U)
IGNITION SYSTEM
ON-VEHICLE INSPECTION
NOTICE:
ºColdº and ºHotº in these sentences express the tempera-
ture of the coils themselves. ºColdº is from -10°C (14°F) to
50°C (122°F) and ºHotº is from 50°C (122°F) to 100°C
(212°F).
1. INSPECT IGNITER AND SPARK TEST
Check that the spark occurs.
(1) Remove the ignition coil. (See page IG-6)
(2) Remove the spark plug.
(3) Install the spark plug to the ignition coil, and connect
the ignition coil connecter.
(4) Ground the spark plug.
(5) Check if spark occurs while engine is being
cranked.
NOTICE:
To prevent excess fuel being injected from the injectors
during this test, do not crank the engine for more than 5 -
10 seconds at a time.
If a spark does not occur, do the test as follows: