Page 1347 of 1807
EM0AS-02
S00574
Z18960
Support
Ring
TailpipeTailpipe
Baffle
Gasket RingCenter Exhaust PipeHeat Insulator
Gasket
Ring
Heat InsulatorHeat Insulator
Gasket
Gasket Gasket
GasketHeat Insulator
Heated Oxygen Sensor
Pipe Support Bracket No.2 Front Exhaust Pipe
(with Front TWC)
Non-reusable partNormal RoofSport Roof
Front Exhaust Pipe
(with Rear TWC)
(Bank 1 Sensor 2)
- ENGINE MECHANICAL (2JZ-GTE)EXHAUST SYSTEM
EM-95
1200 Author: Date:
1997 SUPRA (RM502U)
EXHAUST SYSTEM
COMPONENTS
Page 1348 of 1807
PP0QF-01
PP-12
- PREPARATIONENGINE MECHANICAL (2JZ-GTE)
58 Author: Date:
1997 SUPRA (RM502U)
EQUIPMENT
OBDII scan toolEngine speed
Caliper gauge
CO/HC meter
Compression gauge
Connecting rod aligner
Cylinder gauge
Dial indicator
Dye penetrant
Engine tune-up tester
Heater
Micrometer
Mirror
Magnetic finger
Piston ring compressor
Piston ring expander
Plastigage
Precision straight edge
Spring testerValve spring
Steel squareValve spring
Thermometer
Torque wrench
Valve seat cutter
Vernier calipers
V-block
Page 1349 of 1807
EM0A7-02
P11550
CO/HC Meter
- ENGINE MECHANICAL (2JZ-GTE)CO/HC
EM-1
1106 Author: Date:
1997 SUPRA (RM502U)
CO/HC
INSPECTION
HINT:
This check is used only to determine whether or not the idle CO/
HC complies with regulations.
1. INITIAL CONDITIONS
(a) Engine at normal operating temperature
(b) Air cleaner installed
(c) All pipes and hoses of air induction system connected
(d) All accessories switched OFF
(e) All vacuum lines properly connected
HINT:
All vacuum hoses for EGR system, etc. should be properly con-
nected.
(f) SFI system wiring connectors fully plugged
(g) Ignition timing checked correctly
(h) Transmission in neutral position
(i) Tachometer and CO/HC meter calibrated by hand
2. START ENGINE
3. RACE ENGINE AT 2,500 RPM FOR APPROX. 180
SECONDS
4. INSERT CO/HC METER TESTING PROBE AT LEAST
40 cm (1.3 ft) INTO TAILPIPE DURING IDLING
5. IMMEDIATELY CHECK CO/HC CONCENTRATION AT
IDLE AND/OR 2,500 RPM
HINT:
When performing the 2 mode (2,500 rpm and idle) test, follow
the measurement order prescribed by the applicable local regu-
lations.
Page 1350 of 1807
EM-2
- ENGINE MECHANICAL (2JZ-GTE)CO/HC
1107 Author: Date:
1997 SUPRA (RM502U)
If the CO/HC concentration does not comply with regulations,
troubleshoot in the order given below.
(1) Check heated oxygen sensors operation.
(See page SF-82)
(2) See the table below for possible causes, and then
inspect and correct the applicable causes if neces-
sary.
COHCPhenomenonCauses
NormalHighRough idle1. Faulty ignitions:
Incorrect timing
Fouled, shorted or improperly gapped plugs
2. Incorrect valve clearance
3. Leaky EGR valve
4.Leaky intake and exhaust valves
5.Leaky cylinder
LowHighRough idle
(Fluctuating HC reading)1. Vacuum leaks:
PCV hose
EGR valve
Intake manifold
Air intake chamber
Throttle body
IAC valve
Brake booster line
2. Lean mixture causing misfire
HighHighRough idle
(Black smoke from exhaust)1. Restricted air filter:
2. Faulty SFI system:
Faulty fuel pressure regulator
Clogged fuel return line
Defective ECT sensor
Defective turbo pressure sensor
Faulty ECM
Faulty injector
Faulty throttle position sensor
Faulty MAF meter
Page 1351 of 1807
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
Page 1352 of 1807
EM0AB-01
- ENGINE MECHANICAL (2JZ-GTE)IDLE SPEED
EM-13
111 8 Author: Date:
1997 SUPRA (RM502U)
IDLE SPEED
INSPECTION
1. INITIAL CONDITIONS
(a) Engine at normal operating temperature
(b) Air cleaner installed
(c) All pipes and hoses of air induction system connected
(d) All accessories switched OFF
(e) All vacuum lines properly connected
HINT:
All vacuum hoses for EGR system, etc. should be properly connected.
(f) SFI system wiring connectors fully plugged
(g) Ignition timing checked correctly
(h) Transmission in neutral position
2. CONNECT TOYOTA HAND-HELD TESTER OR OBDII SCAN TOO (See page EM-1 1)
3. INSPECT IDLE SPEED
(a) Race the engine speed at 2,500 rpm for approx. 90 seconds.
(b) Check the idle speed.
Idle speed: 650 ± 50 rpm
If the idle speed is not as specified, check the IAC valve.
4. DISCONNECT TOYOTA HAND-HELD TESTER OR OBDII SCAN TOOL
Page 1353 of 1807
EM0AA-02
Q08242
TOYOTA Hand-Held Tester
DLC3
P11288
DLC1
TE1
E1
P11943
Green Lead
Wire
- ENGINE MECHANICAL (2JZ-GTE)IGNITION TIMING
EM-1 1
111 6 Author: Date:
1997 SUPRA (RM502U)
IGNITION TIMING
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. CONNECT TIMING LIGHT TO ENGINE
4. CHECK IDLE SPEED
(a) Race the engine speed at 2,500 rpm for approx. 90 se-
conds.
(b) Check the idle speed.
Idle speed: 650 ± 50 rpm
5. INSPECT IGNITION TIMING
(a) Using SST, connect terminals TE1 and E1 of the DLC1.
SST 09843-18020
(b) Open the igniter connector cover and remove the green
lead wire.
(c) Connect the timing light clip to the green lead wire.
NOTICE:
Use a timing light that can detect the primary signal.
After finishing the inspection, make sure the lead wire
is stored inside the connector cover.
(d) Using a timing light, check the ignition timing.
Ignition timing: 10 ± 2° BTDC @ idle
(Transmission in neutral position)
Page 1354 of 1807
EM-12
- ENGINE MECHANICAL (2JZ-GTE)IGNITION TIMING
111 7 Author: Date:
1997 SUPRA (RM502U)
(e) Remove the SST from the DLC1.
SST 09843-18020
6. FURTHER CHECK IGNITION TIMING
Ignition timing: 10 - 20° BTDC @ idle
(Transmission in neutral position)
HINT:
The timing mark moves in a range between 10° and 20°.
7. DISCONNECT TIMING LIGHT FROM ENGINE
8. DISCONNECT TOYOTA HAND- HELD TESTER OR
OBDII SCAN TOOL
