TOYOTA SUPRA 1995 Service Repair Manual

Simple Method:
(a) Quickly race the engine 5 times to 4,000 rpm.
(b) Remove the spark plug.
(c) Visually check the spark plug.
If the electrode is dry...OK
If the electrode is wet...Proceed to step 4
(d) Reinstall the spark plug.
3. REMOVE SPARK PLUGS
Using a 16 mm plug wrench, remove the 6 spark plugs.
4. VISUALLY INSPECT SPARK PLUGS
Check the spark plug for thread damage and insulator dam-
age.
If abnormal, replace the spark plug.
Recommended spark plug:
ND
PK16R11
NGK
BKR5EP11
5. INSPECT 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.
6. CLEAN 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 kgfVcm
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.
7. REINSTALL SPARK PLUGS
Torque: 18 NVm (180 kgfVcm, 13 ftVlbf)
8. RECONNECT HIGH±TENSION CORDS TO SPARK
PLUGS IG±6
± IGNITION SYSTEM(2JZ±GE)

IGNITION COIL INSPECTION
NOTICE: ºColdº and ºHotº in the following sentences express
the temperature of the coils themselves. ºColdº is from±105C
(145F) to 505C (1225F) and ºHotº is from 505C (1225F) to 1005C
(2125F).
1. DISCONNECT IGNITION COIL CONNECTOR
2. DISCONNECT HIGH±TENSION CORD FROM IGNITION
COIL
3. INSPECT PRIMARY COIL RESISTANCE
Using an ohmmeter, measure the resistance between the
positive (+) and negative (±) terminals.
Primary coil resistance:
Cold:
0.36±0.55

Hot:
0.45±0.65

If the resistance is not as specified, replace the ignition coil.
4. INSPECT SECONDARY COIL RESISTANCE
Using an ohmmeter, measure the resistance between the
positive (+) and high±tension terminals.
Secondary coil resistance:
Cold:
9.0±15.4 k

Hot:
11.4±18.1 k

If the resistance is not as specified, replace the ignition coil.
5. RECONNECT HIGH±TENSION CORD TO IGNITION COIL
6. RECONNECT IGNITION COIL CONNECTOR
DISTRIBUTOR INSPECTION
NOTICE: ºColdº and ºHotº in the following sentences express
the temperature of the coils themselves. ºColdº is from±105C
(145F) to 505C (1225F) and ºHotº is from 505 C (1225F) to 1005C
(2125F).
1. REMOVE DISTRIBUTOR CAP WITHOUT
DISCONNECTING HIGH±TENSION CORDS
2. REMOVE ROTOR
± IGNITION SYSTEM(2JZ±GE)IG±7

3. INSPECT AIR GAP
Using SST (G1 and G2 pickups) and a feeler gauge (NE pick-
up), measure the air gap between the signal rotor and pickup
coil projection.
SST 09240±00020 for G1 and G2 pickups
Air gap:
0.2±0.5 mm (0.008±0.020 in.)
If the air gap is not as specified, replace the distributor hous-
ing assembly.
4. DISCONNECT DISTRIBUTOR CONNECTOR
5. INSPECT SIGNAL GENERATOR (PICKUP COIL)
RESISTANCE
Using an ohmmeter, measure the resistance between termi-
nals.
Pickup coil resistance:
Cold
G1 and G

125 ± 200

G2 and G

125 ± 200

NE and G

155 ± 250

Hot
G1 and G

160 ± 235

G2 and G

160 ± 235

NE and G

190 ± 290

If the resistance is not as specified, replace the distributor
housing assembly.
6. RECONNECT DISTRIBUTOR CONNECTOR
7. REINSTALL ROTOR
8. REINSTALL DISTRIBUTOR CAP
IGNITER INSPECTION
(See procedure Spark Test on page IG±4) IG±8
± IGNITION SYSTEM(2JZ±GE)

HIGH±TENSION CORD AND CORD
CLAMP
COMPONENTS FOR REMOVAL AND
INSTALLATION
± IGNITION SYSTEM2JZ±GEIG±9

HIGH±TENSION CORDS AND CORD
CLAMPS REMOVAL
1. REMOVE THROTTLE BODY
(See throttle body removal in SFI System)
2. REMOVE NO.3 TIMING BELT COVER
(a) Remove the oil filler cap.
(b) Using a 5 mm hexagon wrench, remove the 6 bolts and timing
belt cover.
3. REMOVE CYLINDER HEAD REAR COVER
Using a 5 mm hexagon wrench, remove the 4 bolts and rear
cover.
4. REMOVE HIGH±TENSION CORDS AND CORD CLAMPS
ASSEMBLY
(a) Disconnect the 2 high±tension cord clamps from the claws of
the No.3 cylinder head cover.
(b) Remove the bolt holding the high±tension cord clamp to No.2
cylinder head cover.
(c) Disconnect the high±tension cords from the distributor and
ignition coil.
wUsing a screwdriver, lift up the lock claw and disconnect
the holder from the distributor (ignition coil).
wDisconnect the high±tension cord at the grommet. Do
not pull on the cord.
NOTICE: Pulling on or bending the cords may damage the con-
ductor inside.
IG±10± IGNITION SYSTEM(2JZ±GE)

(d) Disconnect the high±tension cords from the spark plugs.
Disconnect the high±tension cords at the rubber boot. Do not
pull on the cords.
NOTICE: Pulling on or bending the cords may damage the con-
ductor inside.
(e) Re mo ve th e 7 high±tension cords and 8 cord clamps
assembly.
5. REMOVE CORD CLAMPS FROM HIGH±TENSION CORDS
HIGH±TENSION CORDS AND CORD
CLAMPS INSTALLATION
1. INSTALL HIGH±TENSION CORDS
(a) Connect the high±tension cords to the spark plugs.
wFace the cord of the high±tension cord as shown in the
illustration.
± IGNITION SYSTEM(2JZ±GE)IG±11

wFit the high±tension cord by pushing the center and its
outer ring.
(b) Connect the high±tension cords to the distributor and ignition
coil.
wAlign the spline of the distributor (ignition coil) with the
spline groove of the holder.
wPush in the holder together with the grommet until the
claw of the holder locks securely.
NOTICE: Check that holder is correctly installed to the grom-
met and distributor (ignition coil) as shown in the illustration.
wCheck that the lock claw of the holder is engaged by
lightly pulling the holder. IG±12
± IGNITION SYSTEM(2JZ±GE)

(c) Secure the high±tension cords with the 8 cord clamps as
shown in the illustration.
2. INSTALL CYLINDER HEAD REAR COVER
3. INSTALL NO.3 TIMING BELT COVER
4. INSTALL THROTTLE BODY ASSEMBLY
(See throttle body installation in SFI System)
5. FILL WITH ENGINE COOLANT
± IGNITION SYSTEM(2JZ±GE)IG±13

DISTRIBUTOR
COMPONENTS FOR REMOVAL AND
INSTALLATION
DISTRIBUTOR REMOVAL
1. DISCONNECT DISTRIBUTOR CONNECTOR
2. DISCONNECT HIGH±TENSION CORDS FROM
DISTRIBUTOR
Disconnect the 7 high±tension cords from the distributor.
NOTICE: Pulling on or bending the cords may damage the con-
ductor inside.
3. REMOVE DISTRIBUTOR
(a) Remove the nut.
(b) Pull out the distributor.
(c) Remove the O±ring from the distributor housing. IG±14
± IGNITION SYSTEM2JZ±GE

COMPONENTS FOR DISASSEMBLY AND
ASSEMBLY
DISTRIBUTOR DISASSEMBLY
Assembly is in the reverse order of disassembly.
1. REMOVE HEAT INSULATOR
Remove the 3 screws and heat insulator.
2. REMOVE DISTRIBUTOR CAP
Loosen the 3 bolts, and remove the distributor cap and O±
ring.
ASSEMBLY HINT: Use a new O±ring.
± IGNITION SYSTEM(2JZ±GE)IG±15