1991 LEXUS SC400 transmission

IDLE AND/OR 2,500 RPM CO/HC
CHECK
EG116±05
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 prop-
erly connected.
(f) MFI system wiring connectors fully plugged
(g) Ignition timing set 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 INTO TAILPIPE AT LEAST 40 cm (1.3 ft) DURING IDLING
5. IMMEDIATTELY 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 regulations.
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(c) Disconnect the following hoses:(1) 2 oil cooler hoses (for cooling fan) from pipes
(2) 2 radiator hoses
(3) 2 oil cooler hoses (for transmission) from radiator
HINT: Plug the hose ends.
(4) Suction hose from hydraulic pump
(5) Pressure hose from hydraulic pump
(d) Remove the 2 bolts, screw and upper radiator support. Remove the 2 upper radiator supports.
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20. REMOVE DISTRIBUTOR CAPSLoosen the 3 bolts, and remove the distributor cap.
Remove the 2 distributor caps.
HINT: Arrange the distributor caps (RH side and LH side).
21. REMOVE DISTRIBUTOR ROTORS Loosen the 2 bolts, and remove the distributor rotor.
Remove the 2 distributor rotors.
HINT: Arrange the distributor rotors (RH side and LH side).
22. REMOVE DISTRIBUTOR HOUSINGS
(a) RH Distributor Housing: Disconnect the camshaft position sensor connector.
(b) Remove the 3 bolts and distributor housing. Remove the 2 distributor housings.
23. REMOVE GENERATOR
(a) Disconnect the generator connector.
(b) Remove the cap and nut, and disconnect the generator wire.
(c) Remove the bolt, and disconnect the transmission oil cooler pipe bracket from the generator.
(d) Remove the nut and generator.
24. REMOVE DRIVE BELT TENSIONER Remove the bolt, 2 nuts and belt tensioner.
EG±52
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19. INSTALL DRIVE BELT TENSIONERInstall the belt tensioner with the bolt and 2 nuts.
Torque: 16 N Vm (160 kgf Vcm, 12 ft Vlbf)
HINT: Use bolt 106 mm (4.18 in.) in length.
20. INSTALL GENERATOR
(a) Install the generator and transmission oil cooler pipe bracket with the bolt and nut.
Torque: 37 N Vm (380 kgf Vcm, 27 ft Vlbf)
(b) Connect the generator connector.
(c) Connect the generator wire with the nut and cap.
21. INSTALL RH DISTRIBUTOR HOUSING
Install the distributor housing with the 3 bolts.
Torque: 18 N Vm (185 kgf Vcm, 13 ft Vlbf)
HINT:
w The RH distributor housing is marked with ªRº.
w Each bolt length is indicated in the illustration.
Bolt length:
38 mm (1.50 in.) for A
96 mm (3.78 in.) for B
22. INSTALL LH DISTRIBUTOR HOUSING Install the distributor housing with the 3 bolts.
Torque: 18 N Vm (185 kgf Vcm, 13 ft Vlbf)
HINT:
w The LH distributor housing is marked with ªLº.
w Each bolt length is indicated in the illustration.
Bolt length:
38 mm (1.50 in.) for A
80 mm (3.15 in.) for B
23. INSTALL DISTRIBUTOR ROTORS
(a) Align the protrusion of the distributor rotor with the groove the
camshaft timing pulley.
(b) Install the distributor rotor with the 2 bolts. Install the 2 distributor rotors.
Torque: 3.8 N Vm (39 kgf Vcm, 34 in. Vlbf)
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(e) Connect the following hoses:(1) 2 oil cooler hoses (for cooling fan) to pipes
(2) 2 radiator hoses
(3) 2 oil cooler hoses (for transmission) to radiator
(4) Suction hose to hydraulic pump
(5) Pressure hose to hydraulic pump
(f) Connect the ECT sensor connector (for cooling fan).
(g) Install the ECT sensor wire clamp to the radiator fan shroud.
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39. INSTALL RADIATOR RESERVOIR TANK
(a) Install the reservoir tank to the reservoir tank bracket.
(b) Install the reservoir tank with the bracket and 3 bolts.
Torque: 4.9 NVm (50 kgf Vcm, 43 in. Vlbf)
(c) Connect the following hoses:
(1) Reservoir hose to water inlet housing
(2) Reservoir hose to radiator
(d) Connect the coolant level sensor connector.
40. INSTALL DRIVE BELT Install the drive belt by turning the drive belt tensioner coun-
terclockwise.
HINT: The pulley bolt for the dive belt tensioner has a left
hand thread.
41. INSTALL BATTERY
42. FILL WITH ENGINE COOLANT
43. START ENGINE AND CHECK FOR LEAKS
44. CHECK TRANSMISSION FLUID LEVEL
45. INSTALL ENGINE UNDER COVER
EG±72
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(b) Remove the nut and 3 bolts, and disconnect the PS pumpfrom the engine.
5. REMOVE TWC (FRONT)
(a) Remove the 4 bolts holding the pipe support bracket to the transmission.
(b) Remove the 4 bolts and nuts holding the front exhaust pipe to the TWC, and remove the pipe support bracket.
(c) Disconnect the front exhaust pipe from the TWC, and remove
the 2 gaskets.
(d) Using a 14 mm deep socket wrench, remove the 3 nuts, TWC
and gasket. Remove the 2 TWC.
6. REMOVE THROTTLE BODY COVER
(a) Disconnect the EVAP hose from the hose clamp.
(b) Remove the cap nut.
(c) Loosen the 2 bolts, and remove the hose clamp and throttle body cover.
7. DISCONNECT CONTROL CABLES FROM THROTTLE BODY
Disconnect the following cables:
(1) Accelerator cable
(2) Transmission throttle control cable
(3) Cruise control actuator cable
8. REMOVE RH IGNITION COIL
(a) Disconnect the ignition coil connector.
(b) Remove the 2 bolts and ignition coil.
EG±76
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(b) Remove the bolt, stud bolt and accelerator bracket.
(c) Remove the union bolt, union and 2 gaskets.
(d) Disconnect the following connectors:wCold start injector connector
w VSV connector for fuel pressure control
w Except California:
VSV connector for EGR
(e) Remove the union bolt and 2 gaskets, and disconnect the cold start injector tube from the RH delivery pipe.
CAUTION:
w Put a shop towel under the delivery pipe.
w Slowly loosen the union bolt.
(f) Remove the 2 bolts and gasket, and disconnect the EGR
pipe from the air intake chamber.
(g) Remove the 4 bolts, 8 nut and following parts: (1) VSV for fuel pressure
(2) Except California:VSV for EGR
(3) Transmission throttle cable bracket
(h) Disconnect the DLC1 from the air intake chamber.
(i) Remove the air intake chamber and 4 gaskets.
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