check engine light TOYOTA SUPRA 1995 Service Manual PDF

(c) Mark the front of the main bearing cap bolt head with paint.
(d) Retighten the main bearing cap bolts 90° in the numerical
order shown above.
(e) Check that the painted mark is now at a 90° angle to the front.
(f) Check that the crankshaft turns smoothly.
6. CHECK CRANKSHAFT THRUST CLEARANCE
(See step 5 in cylinder block disassembly)
7. INSTALL PISTON AND CONNECTING ROD ASSEMBLIES
Using a piston ring compressor, push the correctly numbered
piston and connecting rod assemblies into each cylinder with
the front mark of the piston facing forward.
8. INSTALL CONNECTING ROD CAPS
A. Place connecting rod cap on connecting rod
(a) Match the numbered connecting rod cap with the connecting
rod.
(b) Install the connecting rod cap with by aligning the dowel pin
to the corrosponding hole.
B. Install connecting rod cap bolts
HINT:
wThe connecting rod cap bolts are tightened in 2
progressive steps (steps (b) and (d)).
wIf any of the connecting rod bolts break or deform,
replace them.
(a) Apply a light coat of engine oil on the threads and under the
heads of the connecting rod cap bolts.
(b) A t first, in sta ll an d alte rn a te ly tig h te n th e bo lts of th e
connecting rod cap in several passes.
Torque: 29 NVm (300 kgfVcm, 22 ftVlbf)
If any one of the connecting rod cap bolts does not meet the
torque specification, replace the cap bolt.
± ENGINEENGINE MECHANICALEG±119

IF VEHICLE IS EQUIPPED WITH MOBIL
RADIO SYSTEM (HAM, CB, ETC.)
If the vehicle is equipped with a mobile communication sys-
tem, refer to the precaution in the IN section.
AIR INDUCTION SYSTEM
1. Separation of the engine oil dipstick, oil filler cap, PCV hose,
etc. may cause the engine to run out of tune.
2. Disconnection, looseness or cracks in the parts of the air
induction system between the throttle body and cylinder
head will cause air suction and cause the engine to run out
of tune.
ELECTRONIC CONTROL SYSTEM
1. Before removing SFI wiring connectors, terminals, etc., first
disconnect the power by either turning the ignition switch
OFF or disconnecting the negative (±) terminal cable from the
battery.
HINT: Always check the diagnostic trouble code before dis-
connecting the negative (±) terminal cable from the battery.
2. When installing the battery, be especially careful not to
incorrectly connect the positive (+) and negative (±) cables.
3. Do not permit parts to receive a severe impact during removal
or installation. Handle all SFI parts carefully, especially the
ECM.
4. Do not be careless during troubleshooting as there are
numerous transistor circuits and even slight terminal contact
can cause further troubles.
5. Do not open the ECM cover.
6. When inspecting during rainy weather, take care to prevent
entry of water. Also, when washing the engine compartment,
prevent water from getting on the SFI parts and wiring
connectors.
7. Parts should be replaced as an assembly.
8. Care is required when pulling out and inserting wiring
connectors.
(a) Release the lock and pull out the connector, pulling on the
connectors.
(b) Fully insert the connector and check that it is locked. EG±190
± ENGINESFI SYSTEMS (2JZ±GE)

FUEL PRESSURE REGULATOR
INSTALLATION
1. INSTALL FUEL PRESSURE REGULATOR
(a) Apply a light coat of gasoline to a new O±ring, and install it
to the pressure regulator.
(b) Attach the pressure regulator to the delivery pipe.
(c) Check that the pressure regulator rotates smoothly.
NOTICE: If it does not rotate smoothly, the O±ring may be
pinched, so remove the pressure regulator and do steps (b)
and (c) above again.
(d) Install the pressure regulator with the 2 bolts.
Torque: 8.8 NVm (90 kgfVcm, 78 in.Vlbf)
2. CONNECT FUEL RETURN PIPE TO FUEL PRESSURE
REGULATOR
Install the return pipe with 2 new gaskets and the union bolt.
Torque: 27 NVm (280 kgfVcm, 20 ftVlbf)
3. CONNECT VACUUM SENSING HOSE TO FUEL
PRESSURE REGULATOR
4. CHECK FOR FUEL LEAKS
(See item 5 in fuel system in precaution)
± ENGINESFI SYSTEM (2JZ±GE)EG±201

IF VEHICLE IS EQUIPPED WITH MOBILE
RADIO SYSTEM (HAM, CB, ETC.)
If the vehicle is equipped with a mobile communication sys-
tem, refer to the precaution in the IN section.
AIR INDUCTION SYSTEM
1. Separation of the engine oil dipstick, oil filler cap, PCV hose,
etc. may cause the engine to run out of tune.
2. Disconnection, looseness or cracks in the parts of the air
induction system between the throttle body and cylinder
head will cause air suction and cause the engine to run out
of tune.
ELECTRONIC CONTROL SYSTEM
1. Before removing SFI wiring connectors, terminals, etc., first
disconnect the power by either turning the ignition switch
OFF or disconnecting the negative (±) terminal cable from the
battery.
HINT: Always check the diagnostic trouble code before dis-
connecting the negative (±) terminal cable from the battery.
2. When installing the battery, be especially careful not to
incorrectly connect the positive (+) and negative (±) cables.
3. Do not permit parts to receive a severe impact during removal
or installation. Handle all SFI parts carefully, especially the
ECM.
4. Do not be careless during troubleshooting as there are
numerous transistor circuits and even slight terminal contact
can cause further troubles.
5. Do not open the ECM cover.
6. When inspecting during rainy weather, take care to prevent
entry of water. Also, when washing the engine compartment,
prevent water from getting on the SFI parts and wiring
connectors.
7. Parts should be replaced as an assembly.
8. Care is required when pulling out and inserting wiring
connectors.
(a) Release the lock and pull out the connector, pulling on the
connectors.
(b) Fully insert the connector and check that it is locked.
± ENGINESFI SYSTEM (2JZ±GTE)EG±261

FUEL PRESSURE REGULATOR
INSTALLATION
1. INSTALL FUEL PRESSURE REGULATOR
(a) Apply a light coat of gasoline to a new O±ring, and install it
to the pressure regulator.
(b) Attach the pressure regulator to the delivery pipe.
(c) Check that the pressure regulator rotates smoothly.
NOTICE: If it does not rotate smoothly, the O±ring may be
pinched, so remove the pressure regulator and do steps (b)
and (c) above again.
(d) Install the pressure regulator with the 2 bolts.
Torque: 8.8 NVm (90 kgfVcm, 78 in.Vlbf)
2. CONNECT FUEL RETURN PIPE TO FUEL PRESSURE
REGULATOR
Install the return pipe with 2 new gaskets and the union bolt.
Torque: 27 NVm (280 kgfVcm, 20 ftVlbf)
3. CONNECT VACUUM SENSING HOSE TO FUEL
PRESSURE REGULATOR
4. INSTALL THROTTLE BODY
(See throttle body installation)
5. CHECK FOR FUEL LEAKS
(See item 5 in fuel system in precaution) EG±272
± ENGINESFI SYSTEM (2JZ±GTE)

ON±VEHICLE INSPECTION
STEERING WHEEL FREEPLAY CHECK
With the vehicle stopped and tires pointed straight ahead,
rock the steering wheel gently back and forth with light finger
pressure.
Freeplay should not exceed the maximum.
 

 
 Freeplay mm(in.) 
Maximum30 (1 18) Maximum30 (1.18)
IDLE±UP CHECK
1. TURN AIR CONDITIONING SWITCH OFF
2. CHECK IDLE±UP
(a) Start engine and run it at idle.
(b) Fully turn the steering wheel.
(c) Check that the engine speed decreases when the air control
valve hose is pinched.
(d) Check that the engine speed increases when the hose is
released.
FLUID LEVEL CHECK
1. KEEP VEHICLE LEVEL
2. CHECK FLUID LEVEL
Check the fluid level in the reservoir.
If necessary, add fluid.
Fluid:
ATF DEXRON[ II
HINT: Check that the fluid level is within the HOT LEVEL
range on the dipstick of the reservoir cap. If the fluid is cold,
check that it is within the COLD LEVEL range.
3. BOOST FLUID TEMPERATURE
(a) Start the engine and run it at idle.
(b) Turn the steering wheel from lock to lock several times to
boost fluid temperature.
Fluid temperature:
805C (1765F)
± STEERINGON±VEHICLE INSPECTIONSR±7

CONNECTORS
Slightly shake the connector vertically and horizontally.
Inspection of connectors
(a) Does the wire harness connecting with its corresponding
part have insufficient slack?
(b) Are the terminals dirty?
(c) Are the terminals making loose contact due to terminals
spread?
WIRE HARNESS
Slightly shake the wire harness vertically and horizontally.
Thoroughly check the connector joint, the fulcrum of the
vibration and the wiring opening in the engine/passenger
compartment panel.
PARTS AND SENSORS
Gently tap the part or sensor considered to be the problem
caused and check if the malfunction will occur.
CAUTION: Do not apply vibration to the center airbag
sensor assembly.
VIBRATION METHOD: When vibration seems to be the major cause.
SYMPTOM SIMULATION
ªIntermittent troubles or problemsº are the malfunctions about which the customer has a complaint, but which
do not occur and cannot be confirmed in the workshop. The intermittent problems also include complaints about
the SRS warning light going on and off erratically.
The self±diagnostic system stores the circuit of the intermittent problem in memory even if the ignition switch
is turned off.
For accurate diagnosis of the problems, ask the customer to obtain as much information as possible following
the customer problem analysis check sheet (See page RS±43) and try to reproduce the intermittent problem.
The problem simulation methods described below are the effective ways to reproduce the problem conditions
by applying vibration, heat, and humidity. RS±48
± SUPPLEMENTAL RESTRAINT SYSTEMTROUBLESHOOTING

INSPECTION PROCEDURES [P] Preparation [C] Check
(1) Turn ignition switch to LOCK.
(2) Disconnect center airbag sensor assembly con±
nector.
(3) Turn ignition switch ON. But do not start engine.
(4) Measure voltage at IG
2 or ACC on connector
wire harness side of center airbag sensor as±
sembly and operate electric system (defogger,
wiper, headlight, heater blower, etc.).
Voltage: 6 V Ð 11.5 V at IG
2 and ACC.
(5) Turn electric system switch OFF.
(6) Turn ignition switch to LOCK.
(7) Remove voltmeter and connect center sensor
assembly connector.
Preparation.
Does SRS warning light turn off?
Turn ignition switch ON.
Operate electric system checked in [1] (4) and
check that SRA warning light goes off.
Turn ignition switch ON.
Check battery and charging system.
(See charging system section)
Check diagnostic trouble code, and if a malfunc-
tion code is output, perform troubleshooting ac-
cording to malfunction code. If a normal code is
output, replace center airbag sensor assembly.
± SUPPLEMENTAL RESTRAINT SYSTEMTROUBLESHOOTINGRS±53

REAR DRIVE SHAFT REMOVAL
Installation is in the reverse order of removal.
INSTALLATION HINT: After installation, check ABS speed
sensor signal.
(See page BR±62)
1. REMOVE REAR WHEEL
Torque: 103 NVm (1,050 kgfVcm, 76 ftVlbf)
2. DISCONNECT EXHAUST PIPE MOUNTING
(a) Remove the 2 exhaust pipe support rings.
(b) Support the exhaust pipe securely.
(c) Remove the 2 exhaust pipe support O±rings.
3. REMOVE COTTER PIN, LOCK CAP AND LOCK NUT
(a) Remove the cotter pin and lock cap.
(b) While depressing the brake pedal, remove the nut.
Torque: 289 NVm (2,950 kgfVcm, 213 ftVlbf)
4. REMOVE LOWER SUSPENSION ARM BRACE
Remove the 4 bolts and lower suspension arm brace.
Torque: 18 NVm (180 kgfVcm, 13 ftVlbf)
5. REMOVE REAR DRIVE SHAFT
(a) Place matchmarks on the drive shaft and side gear shaft.
NOTICE: Do not use a punch to mark the matchmarks.
Use paint, etc.
(b) Using a 10 mm hexagon wrench, remove the 6 hexagon bolts
and 2 washers while depressing the brake pedal.
Torque: 83 NVm (850 kgfVcm, 61 ftVlbf)
INSTALLATION HINT: Apply a light coat of engine oil on the
threads of the bolts.
(c) Disconnect the inboard joint from the differential side gear
shaft.
(d) Hold the inboard joint side of the drive shaft so that the
outboard joint side does not bend too much.
± SUSPENSION AND AXLEREAR DRIVE SHAFTSA±47

DIAGNOSIS SYSTEM
DESCRIPTION
The ECM contains a built±in self±diagnosis system by which
troubles with the engine signal network are detected and a Mal-
function Indicator Lamp on the instrument panel lights up.
By analyzing various signals as shown in a later table (See page
EG±388) the Engine Control Module (ECM) detects system mal-
functions relating to the sensors or actuators.
In the normal mode, the self±diagnosis system monitors 18
(California specification vehicles) or 17 (except for California and
Canadian specification) items, indicated by code No. as shown in
EG±388. A malfunction indicator lamp informs the driver that a
malfunction has been detected. The lamp goes off automatically
when the malfunction has been repaired, but the diagnostic
trouble code(s) remains stored in the ECM memory (except for
code Nos. 16 and 53). The ECM stores the code(s) until it is
cleared by removing the EFI No. 1 fuse with the ignition switch
OFF.
The diagnostic trouble code can be read by the number of blinks
of the malfunction indicator lamp when TE1 and E1 terminals on
the data link connector 1 or 2 are connected. When 2 or more
codes are indicated, the lowest number (code) will appear first.
In the test mode, 12 (California specification vehicles) or 11 (ex-
cept for California and Canadian specification vehicles) items, in-
dicated by code No. as shown in EG±388 are monitored. If a mal-
function is detected in any one of the systems indicated by code
Nos. 13, 21, 22, 24, 25, 26, 27, 28, 35, 41, 71 and 78 (California
specification vehicles) or 13, 21, 22, 24, 25, 28, 35, 41, 71 and 78
(except for California and Canadian specification vehicles) the
ECM lights the malfunction indicator lamp to warn the technician
that a malfunction has been detected. In this case, TE2 and E1
terminals on the data link connector 2 should be connected as
shown later. (See page EG±386).
In the test mode, even if the malfunction is corrected, the malfunc-
tion code is stored in the ECM memory even when the ignition
switch OFF (except code Nos. 43 and 51). This also applies in the
normal mode. The diagnostic trouble mode (normal or test) and
the output of the malfunction indicator lamp can be selected by
connecting the TE1, TE2 and E1 terminals on the data link con-
nector 2, as shown later.
A test mode function has been added to the functions of the self±
diagnosis system of the normal mode for the purpose of detecting
malfunctions such as poor contact, which are difficult to detect in
the normal mode. This function fills up the self±diagnosis system.
The test mode can be implemented by the technician following the
appropriate procedures of check terminal connection and opera-
tion described later. (See page EG±386) EG±384
± ENGINE2JZ±GE ENGINE TROUBLESHOOTING