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Room temperature sensor circuit Ambient temperature sensor circuit Evaporator temperature sensor circuit Engine coolant temperature commu- nication circuit Solar sensor circuit (short) (Passenger side) Solar sensor circuit (open) Compressor lock sensor circuit Pressure switch circuit Solar sensor circuit (short) (Driver side) Solar sensor circuit (open) Air mix damper position sensor circuit (Passenger side) Air inlet damper position sensor circuit Air outlet damper position sensor circuit 2003 4RUNNER REPAIR MANUAL (RM1001U) Air mix damper position sensor circuit (Driver side) Air mix damper control servomotor (Passenger side) Air inlet damper control servomotor Air outlet damper control servomotor Air mix damper control servomotor (Driver side)

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4Runner uses Nippondenso 4-brush, solenoid-actuated, reduction gear type starters, equipped with over-running clutches. The brush holder assembly retains 4 brushes and springs in the starter Reduction gear type starters contain an integral solenoid attached to drive housing, a reduction idler gear and bearing installed into starter housing, and a clutch drive assembly. The clutch drive assembly is mounted to starter housing and is driven by the reduction idler gear from armature shaft. The brush holder assembly retains 4 brushes and 4 springs in the end cover of field frame housing. Planetary gear type starters contain a clutch pinion drive assembly mounted in-line with armature shaft. The clutch pinion drive assembly is mounted onto drive end of planetary gear carrier shaft which is driven by armature shaft. The planetary gears increase torque from armature to turn clutch pinion drive assembly.

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Celica (3S-GE & 3S-GTE), Corolla (4A-GE) & MR2 Each cylinder in the intake manifold is divided into 2 parts. An intake air control valve is installed in one passage on each cylinder runner. The opening and closing of this valve gives the best airflow possible, preventing low-speed performance loss and improved fuel economy. The intake control valves are vacuum actuated. The vacuum signal is controlled by the ECU through a vacuum switching TURBOCHARGERS Celica Turbo (3S-GTE) uses a water-cooled intercooler. Intercooler system uses separate coolant reservoir and radiator from the engine coolant. Maximum boost pressure is relieved by wastegate. Wastegate has a dual control from 2 pressure signals: a direct signal from downstream of the impeller wheel, and ECU controlled signal from upstream of the impeller wheel. Celica Turbo intercooler system also has coolant level warning sensor which signals a control module when the intercooler coolant is too low. Low coolant level will cause the “CHECK ENGINE” warning light to come on. Control module is above the glove box.

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CARBURETOR (COROLLA) REMOVAL 1) Drain cooling system. Disconnect air intake hose. Disconnect emission control hoses from air cleaner. Remove air cleaner mounting bolt and wing nut. Remove air cleaner. 2) Disconnect accelerator cable. Disconnect throttle cable (A/T). Disconnect carburetor wiring connector. Disconnect emission control hoses and tag for installation. Disconnect fuel inlet hose. Remove 4 carburetor mounting nuts and No. 1 vacuum pipe. Remove carburetor. DISASSEMBLY Air Horn 1) Remove air cleaner setting bolt. Remove fuel pipe clamp, union, fuel pipe and gaskets. Remove vacuum hoses. Remove pump and pivot screw and pump arm with connecting link. Disconnect choke link and choke opener link. 2 Remove 8 air horn screws and number plate, fuel pipe support and wire clamps. Remove air horn from carburetor body. Disconnect wiring from solenoid valves. 3) Remove float pivot pin, float and needle valve assembly. Remove air horn gasket, needle valve seat and gasket, power piston retainer, power piston and spring. Remove pump plunger and boot. See Fig. 2.

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Page 1 CAMSHAFTS Removal 1. For access to valve covers, air intake chamber and intake air connector must be removed. See Fig. 11 . 2. Remove air cleaner hose along with upper cap on air cleaner and mass airflow meter. Disconnect necessary electrical connectors, control cables, vacuum hoses and coolant hoses for removal of air intake chamber with throttle body. 3. On models with EGR, remove nuts, EGR pipe and gaskets. On all models, remove bolts and air intake chamber support brace from air intake chamber. Remove bolts/nuts, air intake chamber and gasket. 4. Disconnect necessary electrical connectors, ground straps, vacuum hoses and wiring brackets for removal of intake air connector. Remove bolts/nuts, intake air connector and gasket. 5. Disconnect necessary electrical connectors and wiring clamps for removal of engine wiring harness assembly for access to valve covers. Remove bolts, ignition coils with spark plug wires from valve covers. Remove bolts, seal washers, valve covers and gaskets. 6. Remove timing belt and camshaft sprockets. See TIMING BELT under REMOVAL & INSTALLATION. Remove bolts, camshaft position sensor, rear timing belt cover and gaskets. See Fig. 15 . 7. To service camshafts in right cylinder head, align timing marks with 2 dots on camshaft gears by rotating camshaft using hexagonal area of camshaft. See Fig. 25 . To service camshafts in left cylinder head, align timing marks with one dot on camshaft gears by rotating camshaft using hexagonal area of camshaft. See Fig. 25 .