Automotive Manual PDF

This article covers basic description and operation of engine performance-related systems and components. Read this article before diagnosing vehicles or systems with which you are not completely familiar.

COMPUTERIZED ENGINE CONTROLS TOYOTA COMPUTER CONTROL SYSTEM (TCCS)
The TCCS is a computerized emission, ignition and fuel injection control system. The TCCS lowers exhaust emissions while maintaining good fuel economy and driveability. System consists of various sensors, switches and control units. See Figs. 1 and 2. An Engine Control Module (ECM) controls the TCCS based on input signals received from various input devices. The ECM contains preprogrammed data to maintain optimum engine performance under all operating conditions.
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All doors can be locked or unlocked simultaneously using either front door. Turning driver-side door lock once will unlock driver-side door only, twice will unlock all doors. Door locks can be controlled by switches on driver-side or passenger-side doors within vehicle, or by operating each door lock with key or lock knob. Front door(s) cannot be manually locked when key is in ignition switch.
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Before diagnosing symptoms or intermittent faults, perform steps in articles listed below:
F - BASIC TESTING
G - TESTS W/CODES - 1.8L
G - TESTS W/CODES - 2.2L
Use this article to diagnose driveability problems existing when a hard fault code is not present.
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THERMOSTAT
Most thermostats are thermal wax pellet type. As coolant temperature rise the wax begins to expand. This expansion overcomes spring tension allowing the thermostat to open. Some thermostats also incorporate an additional bleed hole to allow a small amount of circulation and eliminate air blocks.
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Inspect fluid level every 15,000 miles. Under severe operating conditions, change ATF and filter every 15,000 miles or 24 months.
CHECKING FLUID LEVEL
Transmission
Check fluid with vehicle on level surface and at normal operating temperature. With engine idling, shift each gear from “P” through “L” and back to “P”. Fluid level should be in HOT range marked on dipstick. DO NOT overfill.
NOTE: If vehicle has been operated in heavy traffic, pulling a trailer or at high speeds in hot weather, wait 30 minutes before checking fluid level.
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Before performing any on-vehicle adjustments to fuel or ignition systems, ensure engine mechanical condition is okay.
VALVE CLEARANCE
NOTE: Adjust valve clearance with engine cold.
NOTE: If valve cover uses grommets below retaining nuts or bolts, keep grommets in order so they are installed in original locations during reassembly.
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Clutch is a single, dry disc type using a hydraulically operated master cylinder and clutch housing mounted slave cylinder. On Land Cruiser, slave cylinder is adjustable. On all others, slave cylinder is nonadjustable. Clearance is automatically compensated by internal design of cylinder.

PEDAL HEIGHT & FREE PLAY
Rotate pedal stop bolt at top of pedal assembly to adjust pedal height. To adjust free play, loosen lock nut on master cylinder push rod and turn push rod in or out to specified free play. See CLUTCH PEDAL SPECIFICATIONS TABLE. Tighten lock nut.
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The A-240 “E” series automatic transmission is electronically controlled. Transmission shifting and torque converter lock-up are controlled by an Electronic Controlled Transmission (ECT) Electronic Control Unit (ECU). Control unit is referred to as the ECT ECU.

NOTE: ECT ECU is combined with the engine ECU into one unit. This control unit is referred to as the engine and ECT ECU. See Figs. 1-8. In this article, control unit will be referred to as the ECT ECU on all models. The ECT ECU receives information from various input devices and uses this information to control No. 1 and No. 2 solenoids for transmission shifting and lock-up solenoid for torque converter lock-up.
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The A-140E automatic transmission is electronically controlled. Transmission shifting and torque converter lock-up are controlled by an Electronic Controlled Transmission (ECT) Electronic Control Unit (ECU). Control unit is referred to as the ECT ECU. NOTE: ECT ECU is combined with the engine ECU into one unit. This control unit is referred to as the engine and ECT ECU. See Figs. 1-3. In this article, control unit will be referred to as the ECT ECU on all models.
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The Exhaust Gas Recirculation (EGR) system is used for the reduction of NOx emissions by lowering combustion temperatures. Recycling metered amounts of exhaust gas back into the intake system lowers combustion temperatures. Each system has a vacuum-operated EGR valve and a vacuum modulator. Temperature sensing devices control EGR operation. Temperature sensing device used could be a Vacuum Switching Valve (VSV), a Bi-Metallic Vacuum Switching Valve (BVSV), a Thermostatic Vacuum Switching Valve (TVSV), Vacuum Control Valve (VCV) or a combination of these valves. A check valve, EGR cooler and computer may also be used on some models.
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