compression ratio TOYOTA SUPRA 1995 Service Repair Manual

8. EXPANSION VALVE IMPROPERLY
MOUNTED/HEAT SENSING TUBE DEFECTIVE
(OPENS TOO WIDE)
Symptom seen in
refrigeration systemProbable causeDiagnosisRemedy
(1) Check heat sensing tube
installed condition
(2) if (1) is normal, check
expansion valve
Replace if defective
Pressure too high on both
low and high pressure
sides

Frost or large amount of
dew on piping on low
pressure side
Trouble in expansion
valve or heat sensing tube
not installed correctly
Excessive refrigerant in
low pressure piping
Condition: Insufficient cooling

Expansion valve opened
too wide
9. DEFECTIVE COMPRESSION COMPRESSOR
Symptom seen in
refrigeration systemProbable causeDiagnosisRemedy
Condition: Does not cool

Repair or replace
compressor
Pressure too high on
low pressure sides

Pressure too low on
high pressure side
Internal leak in
compressor
Compression defective

Valve leaking or broken,
sliding parts
± AIR CONDITIONING SYSTEMTROUBLESHOOTINGAC±75

VALVE CLEARANCE INSPECTION AND
ADJUSTMENT (2JZ±GE)
HINT: Inspect and adjust the valve clearance when the en-
gine is cold.
1. REMOVE THROTTLE BODY AND INTAKE AIR
CONNECTOR ASSEMBLY
(See steps 1 to 9 in injector removal in SFI System)
2. DISCONNECT HIGH±TENSION CORDS FROM
CYLINDER HEAD COVERS
(See high±tension cords and cord clamps removal in
Ignition System)
3. REMOVE NO.3, NO.1 AND NO.2 CYLINDER HEAD
COVERS
(a) Remove the 4 bolts, 4 nuts and No.3 cylinder head cover.
(b) Remove the 4 bolts, No.1 cylinder head cover and gasket.
(c) Remove the 4 bolts, No.2 cylinder head cover and gasket.
4. SET NO.1 CYLINDER TO TDC/COMPRESSION
(a) Turn the crankshaft pulley, and align its groove with timing
mark ºOº of the No.1 timing belt cover.
NOTICE: Always turn the crankshaft clockwise.
(b) Check that the timing marks of the camshaft timing pulleys
are aligned with the timing marks of the No.4 timing belt
cover.
If not, turn the crankshaft 1 revolution (360°).
5. INSPECT VALVE CLEARANCE
(a) Check only those valves indicated in the illustration.
wUsing a feeler gauge, measure the clearance between
the valve lifter and camshaft.
wRecord the valve clearance measurements of those that
are out of specification. They will be used later to
determine the required replacement adjusting shim.
± ENGINEENGINE MECHANICALEG±11

7. SET NO.1 CYLINDER TO TDC/COMPRESSION
(a) Turn the crankshaft pulley, and align its groove with timing
mark ºOº of the No.1 timing belt cover.
NOTICE: Always turn the crankshaft clockwise.
(b) Check that the timing marks of the camshaft timing pulleys
are aligned with the timing marks of the No.4 timing belt
cover.
If not, turn the crankshaft 1 revolution (360°).
8. REMOVE TIMING BELT FROM CAMSHAFT TIMING
PULLEYS
HINT (Re±using timing belt): Place matchmarks on the timing
belt and camshaft timing pulleys as shown in the illustration.
(a) Alternately loosen the 2 bolts, and remove them, the
tensioner and dust boot.
(b) Disconnect the timing belt from the camshaft timing pulleys.
± ENGINEENGINE MECHANICALEG±25

(09957±04010)
09950±40010
(09958±04010)
09950±50010
(09951±05010)
(09952±05010)
(09953±05020)
(09954±05020)
09960±10010
Puller B Set
Attachment
Holder
Puller C Set
Slide Arm
Hanger 150
Center Bolt 150
Variable Pin Wrench Set
Claw No.2
Vane pump pulley
Main shaft assembly
Main shaft assembly
RECOMMENDED TOOLS
Total preload
Steering wheel pad
Compression spring
Snap Ring No.1 Expander
TOYOTA Electrical Tester Set
Torx Socket T30
Torque Wrench (30 kgf
cm)09025±00010
09042±00010
09082±00050
09905±00012
± STEERINGPREPARATIONSR±5

(e) Torque the nut of the tilt No.2 bolt side.
Torque: 15 NVm (150 kgfVcm, 11 ftVlbf)
(f) Torque the nut of the memory bolt side.
Torque: 5.9 NVm (60 kgfVcm, 52 in.Vlbf)
(g) Install the spacer and a new E±ring.
13. INSTALL TILT LEVER RIGHT RETAINER
(a) Torque the nut.
Torque: 15 NVm (150 kgfVcm, 11 ftVlbf)
(b) Install a new E±ring.
14. INSTALL TURN SIGNAL BRACKET
(a) Apply sealant to 2 or 3 threads of the 2 bolts.
Sealant:
Part No. 08833±00080, THREE BOND 1344, LOCTITE
242 or equivalent.
(b) Torque the 2 bolts.
Torque: 8.8 NVm (90 kgfVcm, 78 in.Vlbf)
15. INSTALL 3 TENSION SPRINGS
16. INSTALL COMPRESSION SPRING
(a) Install the 2 bushings to the spring.
(b) Apply sealant to 2 or 3 threads of the torx screw.
Sealant:
Part No. 08833±00080, THREE BOND 1344, LOCTITE
242 or equivalent.
(c) Using a torx socket wrench, torque the screw.
Torque: 6.4 NVm (65 kgfVcm, 56 in.Vlbf)
17. INSTALL COLUMN PROTECTOR AND WIRING HARNESS
CLAMP
Tighten the 2 screws.
18. INSTALL COLUMN UPPER BRACKET
Tighten the 2 new tapered±head bolts until the bolt head
breaks off.
19. INSTALL COLUMN LOWER COVER
Tighten the clamp.
20. INSTALL SHAFT THRUST STOPPER AND SLIDING YOKE
(a) Align the matchmarks on the yoke and main shaft.
(b) Torque the bolt.
Torque: 35 NVm (360 kgfVcm, 26 ftVlbf)
21. INSTALL INTERMEDIATE SHAFT
Temporarily tighten the bolt.
22. CHECK TILT OPERATION SR±20
± STEERINGTILT STEERING COLUMN

MATRIX CHART OF PROBLEM SYMPTOMS
When the malfunction code is not confirmed in the diagnostic trouble code check and the problem still can not
be confirmed in the basic inspection, proceed to this matrix chart and troubleshoot according to the numbered
order given below.
EG±438EG±438EG±453EG±460EG±463EG±465EG±470EG±472EG±475EG±457EG±481AC±62ST±3, 12IG±4IG±5IG±7IG±7EG±9AT2±81BE±123IN±35
See page
Suspect area
Symptom
Engine does not crank
No initial combustion
No complete combustion
Engine cranks normally
Cold engine
Hot engine
Incorrect first idle
High engine idle speed
Low engine idle speed
Rough idling
Hunting
Hesitation/Poor acceleration
Muffler explosion (after fire)
Surging
Soon after starting
After accelerator pedal depressed
After accelerator pedal released
During A/C operation
When shifting N to D
Does notstart
Difficult tostart
Poor Idling
Poor
Driveability
Engine Stall
Volume air flow meter circuitECM power source circuitPark/neutral position switch circuitSwitch condition signal circuitEGR systemStarter signal circuitStarter and Starter relayA/C signal circuit (Compressor circuit)VSV circuit for fuel pressure controlFuel pump control circuitIAC valve circuitInjector circuitBack up power source circuitIgnition coilSpark plugIgnition signal circuit (Spark test)CompressionA/T faultyDistributorEngine control module (ECM)Theft deterrent ECU
EG±408± ENGINE2JZ±GE ENGINE TROUBLESHOOTING

CIRCUIT DESCRIPTION
See page EG±419 for the circuit description
DTC No.Diagnostic Trouble Code Detecting ConditionTrouble Area
(1) (Main heated*1) oxygen sensor voltage is
0.45 V or less (lean) for 90 sec. under codi±
tions (a) and (b):
(2 trip detection logic)*
2
(a) Engine coolant temp.: 70°C (158°F)
or more
(b) Engine speed: 1,500 rpm or more
(2)*1Difference of air±fuel ratio feedback
compensation value between front (No.
1 ~ 3 cylinders) and rear (No. 4 ~ 6
cylinders) is more than 15 percentage for
20 sec. or more under conditions (a)
and (b):
(2 trip detection logic)*
2
(a) Engine speed: 2,000 rpm or more
(b) Engine coolant temp.: Between 60°C
(140°F) and 95°C (203°F)
(1)*1Difference of air±fuel ratio feedback
compensation value between front (No.
1 ~ 3 cylinders) and rear (No. 4 ~ 6
cylinders) is more than 15 percentage for
20 sec. or more under conditions (a)
and (b):
(2 trip detection logic)*
2
(a) Engine speed: 2,000 rpm or more
(b) Engine coolant temp.: Between 60°C
(140°F) and 95°C (203°F)
(3)*1Engine speed varies by more than 15 rpm
over the preceding crank angle period
during a period of 20 sec. or more under
conditions (a) and (b):
(2 trip detection logic)*
2
(a) Engine speed: Idling
(b) Engine coolant temp.: Between 60°C
(140°F) and 95°C (203°F)
(2) Engine speed varies by more than 15 rpm
over the preceding crank angle period
during a period of 20 sec. or more under
conditions (a) and (b):
(2 trip detection logic)*
2
(a) Engine speed: Idling
(b) Engine coolant temp.: Between 60°C
(140°F) and 95°C (203°F)
*1: Only for California specification vehicles
*
2: See page EG±397.

Open or short in (main heated*1) oxygen
sensor circuit

(Main heated*
1) oxygen sensor

Ignition system

ECM

Open and short in injector circuit

Fuel line pressure (injector leak, blockage)

Mechanical system malfunction
(skipping teeth of timing belt)

Ignition system

Compression pressure (foreign object caught
in valve)

Volume air flow meter (air intake)

ECM

Open and short in injector circuit

Fuel line pressure (injector leak, blockage)

Mechanical system malfunction
(skipping teeth of timing belt)

Ignition system

Compression pressure (foreign object caught
in valve)

Volume air flow meter (air intake)

ECM

Open and short in injector circuit

Fuel line pressure (injector leak, blockage)

Mechanical system malfunction
(skipping teeth of timing belt)

Ignition system

Compression pressure (foreign object caught
in valve)

Volume air flow meter (air intake)

ECM

Open and short in injector circuit

Fuel line pressure (injector leak, blockage)

Mechanical system malfunction
(skipping teeth of timing belt)

Ignition system

Compression pressure (foreign object caught
in valve)

Volume air flow meter (air intake)

ECM
DTC 25 26 Air±Fuel Ratio Lean Rich Malfunction
EG±428± ENGINE2JZ±GE ENGINE TROUBLESHOOTING

Suspect area
See page
Symptom
Engine does not crank
No initial combustion
No complete combustion
Engine cranks normally
Cold engine
Hot engine
Incorrect first idle
High engine idle speed
Low engine idle speed
Rough idling
Hunting
Hesitation/Poor acceleration
Muffler explosion (after fire)
Surging
Soon after starting
After accelerator pedal depressed
After accelerator pedal released
During A/C operation
When shifting N to D
Does not
start
Difficult to
start
Poor Idling
Engine Stall
Poor
Driveability
Back up power source circuitECM power source circuitPark/neutral position switch circuitSwitch condition signal circuitEGR systemStarter signal circuitMass air flow meter circuitInjector circuitIAC valve circuitFuel pump control circuitA/C signal circuit (Compressor circuit)Turbo control circuitVSV circuit for fuel Pressure ControlCompressionSpark plugIgnition signal circuit (Spark test)Starter and Starter relayIgnition coilEngine control module (ECM)Theft deterrent ECUA/T faulty
EG±544EG±559EG±564EG±571EG±574EG±576EG±581EG±583EG±586EG±568EG±595EG±589AC±62ST±3
,
12
IG±21IG±23IG±22EG±9AT2±101BE±123IN±35
MATRIX CHART OF PROBLEM SYMPTOMS
When the malfunction code is not confirmed in the diagnostic trouble code check and the problem still can not
be confirmed in the basic inspection, proceed to this matrix chart and troubleshoot according to the numbered
order given below. EG±514
± ENGINE2JZ±GTE ENGINE TROUBLESHOOTING

DTC 25 26 Air±Fuel Ratio Lean Rich Malfunction
CIRCUIT DESCRIPTION
See EG±525 for the circuit description.
 DTC No. Diagnostic Trouble Code Detecting Condition Trouble Area
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(1) Main heated oxygen sensor voltage is
0.45 V or less (lean) for 90 sec. under
conditions (a) and (b):
(2 trip detection logic)*
2
(a) Engine coolant temp.: 70°C (158°F)
or more
(b) Engine speed: 1,500 rpm or more
 
 
 
 
 
 
 

Open or short in main heated oxygen
sensor circuit

Main heated oxygen sensor

Ignition system

ECM
 
 
 
 
 
 
 
 
25 
 
 
 
 
 
 
 
(2) Engine speed varies by more than 20 rpm
over the preceding crank angle period
during a period of 25 sec. or more under
conditions (a) and (b):
(2 trip detection logic).*
(a) Engine speed: Below 950 rpm
(b) Engine coolant temp.: 80°C
(176°F) or
more 
 
 
 
 
 
 
 

Open and short in injector circuit

Fuel line pressure (injector leak, blockage)

Mechanical system malfunction
(skipping teeth of timing belt)

Ignition system

Compression pressure (foreign object
caught in valve)

Mass air flow meter (air intake)

ECM
 
 
 
 
 
 
 
 
26
 
 
 
 
 
 
 
 
Engine speed varies by more than 20 rpm over
The preceding crank angle period during a
Period of 25 sec. or more under conditions (a)
And (b):
(2 trip detection logic).*
(a) Engine speed: Below 950 rpm
(b) Engine coolant temp.: 80°C
(176°F) or
more 
 
 
 
 
 
 
 

Open and short in injector circuit

Fuel line pressure (injector leak, blockage)

Mechanical system malfunction
(skipping teeth of timing belt)

Ignition system

Compression pressure (foreign object
caught in valve)

Mass air flow meter (air intake)

ECM
*: See page EG±503. EG±534
± ENGINE2JZ±GTE ENGINE TROUBLESHOOTING