TOYOTA SUPRA 1995 Service Repair Manual

4. INSPECT EGR VALVE
Check for sticking and heavy carbon deposits.
If a problem is found, replace the EGR valve.
5. REINSTALL EGR VALVE
(a) Place a new gasket on the air intake chamber.
(b) Install the EGR valve with the 2 nuts.
Torque: 21 NVm (210 kgfVcm, 15 ftVlbf)
(c) Reconnect the following hoses to the EGR valve:
wVacuum hose
wPressure hose
6. REINSTALL EGR GAS TEMPERATURE SENSOR
Torque: 20 NVm (200 kgfVcm, 14 ftVlbf)
7. REINSTALL EGR PIPE
(a) Temporarily install the union nut of the EGR pipe.
(b) Install a new gasket and the EGR pipe with the 2 bolts.
Torque: 27 NVm (280 kgfVcm, 20 ftVlbf)
(c) Tighten the union nut of the EGR pipe.
Torque: 64 NVm (650 kgfVcm, 47 ftVlbf)
EG±182± ENGINEEMISSION CONTROL SYSTEMS (2JZ±GTE)

THREE±WAY CATALYTIC CONVERTER
(TWC) SYSTEM
EXHAUST PIPE ASSEMBLY INSPECTION
1. CHECK CONNECTIONS FOR LOOSENSESS OR
DAMAGE
2. CHECK CLAMPS FOR WEAKNESS, CRACKS OR
DAMAGE
TWC INSPECTION
CHECK FOR DENTS OR DAMAGE
If any part of the protector is damaged or dented to the extent
that it contacts the TWC, repair or replace it.
HEAT INSULATOR INSPECTION
1. CHECK HEAT INSULATOR FOR DAMAGE
2. CHECK FOR ADEQUATE CLEARANCE BETWEEN
CATALYTIC CONVERTER AND HEAT INSULATOR
± ENGINEEMISSION CONTROL SYSTEMS (2JZ±GTE)EG±183

COMPONENTS FOR FRONT TWC
REPLACEMENT
EG±184± ENGINEEMISSION CONTROL SYSTEMS (2JZ±GTE)

COMPONENTS FOR REAR TWC
REPLACEMENT
± ENGINEEMISSION CONTROL SYSTEMS (2JZ±GTE)EG±185

SERVICE SPECIFICATIONS
TORQUE SPECIFICATIONS
 Part tightened NVm kgfVcm ftVlbf
 EGR valve x Air Intake chamber 21 210 15
 EGR gas temperature sensor x EGR valve 20 200 14 
 EGR pipe x Cylinder head
 
 27
 
 280
 
 20
 EGR valve x EGR pipe 64 650 47
 No.2 front exhaust pipe (Front TWC) x Exhaust manifold 62 630 46
 Pipe support bracket x Transmission 43 440 32 
 No.2 front exhaust pipe (Front TWC) x Front exhaust pipe (Rear TWC) 
 43 
 440 
 32
 Front exhaust pipe (Rear TWC) x Center exhaust pipe 43 440 32
 Sub heated oxygen sensor x Front exhaust pipe 20 200 14
EG±186± ENGINEEMISSION CONTROL SYSTEMS (2JZ±GTE)

IGNITION SYSTEM
IG±1

(2JZ±GE)
PRECAUTION
1. With a tachometer connected to the system, connect the
tester probe of the tachometer to terminal IG
of the
DLC1.
2. As some tachometers are not compatible with this
ignition system, we recommend that you confirm the
compatibility of your unit before use.
3. Never allow the tachometer terminals to touch ground as
it could result in damage to the igniter and/or ignition
coil.
4. Do not disconnect the battery while the engine is
running.
5. Check that the igniter is properly grounded to the body. IG±2
± IGNITION SYSTEM2JZ±GE

PREPARATION
SST (SPECIAL SERVICE TOOLS)
09240±00020Wire Gauge SetDistributor
RECOMMENDED TOOLS
09082±00050TOYOTA Electrical Tester Set


09200±00010Engine Adjust Kit

EQUIPMENT
 Megger insulation resistance meter Spark plug
 Spark plug cleaner 
 Thermometer 
COOLANT
 Item Capacity Classification
 
 Engine coolant (W/Heater) M/T
A/T 
 7.3 liters (7.7 US qts, 6.4 lmp. qts)
8.3 liters (8.8 US qts, 7.3 lmp. qts) 
 Ethylene±glycol base
± IGNITION SYSTEM2JZ±GEIG±3

ON±VEHICLE INSPECTION
SPARK TEST
CHECK THAT SPARK OCCURS
(a) Disconnect the high±tension cord (from the ignition coil) from
the distributor cap.
(b) Hold the end approx. 12.5 mm (0.50 in.) from the body
ground.
(c) See if spark occurs while engine is being cranked.
HINT: To prevent gasoline from being injected from injectors
during this test, crank the engine for no more than 1±2 se-
conds at time.
If the spark does not occur, do the test as follows:
SPARK TEST
Connect securely.CHECK CONNECTION OF IGNITION COIL,
IGNITER AND DISTRIBUTOR CONNECTOR
CHECK RESISTANCE OF HIGH±TENSION CORD(See page IG±5)
Maximum resistance: 25 k
per cord
CHECK POWER SUPPLY TO IGNITION COIL AND
IGNITER
1. Turn ignition switch to ON.
2. Check that there is battery voltage at
ignition coil positive (+) terminal.
CHECK RESISTANCE OF IGNITION COIL(See page IG±7)Resistance: Cold Hot
Primary 0.21 ± 0.33
0.27 ± 0.39

Secondary 6.4 ± 11.1 k
8.2 ± 13.0 k

CHECK RESISTANCE OF SIGNAL GENERATOR
(PICKUP COIL)(See page IG±8)Resistance: Cold Hot
G1 and G
125 ± 200
160 ± 235

G2 and G
125 ± 200
160 ± 235

NE and G
155 ± 250
190 ± 290

CHECK AIR GAP OF DISTRIBUTOR(See page IG±8)Air gap: 0.2 ± 0.5 mm (0.008 ± 0.020 in.)
(See page EG±413)
CHECK IGT SIGNAL FROM ECM
TRY ANOTHER IGNITER
Replace the cord(s).
Check wiring between ignition switch to ignition
coil and igniter.
Replace the ignition coil.
Replace the distributor housing assembly.
Replace the distributor housing assembly.
Check wiring between ECM, distributor and
igniter, and then try another ECM.
IG±4± IGNITION SYSTEM2JZ±GE

HIGH±TENSION CORDS INSPECTION
1. REMOVE THROTTLE BODY
(See throttle body removal in SFI System)
2. REMOVE NO.3 TIMING BELT COVER
3. REMOVE CYLINDER HEAD REAR COVER
4. DISCONNECT HIGH±TENSION CORDS FROM SPARK
PLUGS AND IGNITION COIL
Disconnect the high±tension cords at the rubber boot. Do not
pull on the high±tension cords.
NOTICE: Pulling on or bending the cords may damage the con-
ductor inside.
5. REMOVE DISTRIBUTOR CAP WITHOUT
DISCONNECTING HIGH±TENSION CORDS
6. INSPECT HIGH±TENSION CORD RESISTANCE
Using an ohmmeter, measure the resistance without discon-
necting the distributor cap.
Maximum resistance:
25 k
per cord
If the resistance is greater than maximum, check the termi-
nals. If necessary, replace the high±tension cord and/or dis-
tributor cap.
7. REINSTALL DISTRIBUTOR CAP
8. RECONNECT HIGH±TENSION CORDS TO SPARK
PLUGS AND IGNITION COIL
9. REINSTALL CYLINDER HEAD REAR COVER
10. REINSTALL NO.3 TIMING BELT COVER
11. REINSTALL THROTTLE BODY
(See throttle body installation in SFI System)
SPARK PLUGS INSPECTION
NOTICE:
wNever use a wire brush for cleaning.
wNever attempt to adjust the electrode gap on used a spark
plug.
wSpark plugs should be replaced every 100,000 km (60,000
miles).
1. DISCONNECT HIGH±TENSION CORDS FROM SPARK
PLUGS
2. INSPECT ELECTRODE
Using a megger (insulation resistance meter), measure the
insulation resistance.
Standard correct insulation resistance:
10 M
or more
If the resistance is less than specified, proceed to step 7.
HINT: If a megger is not available, the following simple meth-
od of inspection provides fairly accurate results.
± IGNITION SYSTEM(2JZ±GE)IG±5