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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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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