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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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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When the system judges that the vehicle position information is not accurate based on vehicle speed and gyro sensor data calculations, the system will adjust the vehicle position information using GPS signals.
RECEIVING SIGNALS FROM GPS SATELLITES
Sometimes, satellite reception is weak. The following are places where signals tend to be weak:
● Inside tunnels and parking lots in buildings
● Areas with numerous tall buildings
● Under multi-layered highways
● In a dense forest
● Near military bases and certain government facilities
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All 850 models are equipped with an analog gauge instrument cluster. Speedometer is centrally located with tachometer on right and coolant temperature/fuel gauges on left. Warning/telltale lights arelocated at bottom left and right sides of instrument cluster. Digital clock and ambient temperature display are located under odometer. This section of instrument cluster may contain an optional trip computer that provides information on average fuel consumption, current fuel consumption, average speed, trip meter, ambient temperature and range of fuel in tank. Instrument cluster is equipped with self-diagnostic capabilities.
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The Volvo 850 engine range has been extended with another engine variant B5254T. This is an engine which has been optimized for the best possible comfort. The B5254T has extremely good characteristics at low engine speeds.

Because of the engines excellent pulling power at low speed it is also used in the Volvo 850 AWD. The B5254T is also used in other 850 models and is then available with a manual transmission (M56H) or automatic transmission (AW50-42).
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Instrument Panel Overview
The master key works in every lock. The sub-key will not work in the glovebox. To protect things locked in the glovebox when you have your vehicle parked, leave the subkey with the attendant. Since the doors can be locked without a key, you should always carry a spare master key in case you accidentally lock your keys inside the vehicle.
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Removing steering column switch
Driver’s side airbag unit and steering wheel removed.
- Pull out steering column and tilt downward as far as it will go.
- Remove screws -1-(2x). Tightening torque: 2.8 Nm (25.2 in lb)
- Remove grip - 2-.
- Remove two Phillips-head screws -arrows-. Tightening torque: 0.6 Nm (5.4 in lb)
- Remove upper steering column switch trim -1-.
When installing, insert upper section into hooks on lower section, swivel downward and secure with screws
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ALL TYPES except N engine Adjust the various instrument panel functions (clock, etc…) if necessary. Check that all the instrument panel functions operate correctly. AFTER REPAIR FAULT FINDING CHARTS no CHART 7 SPEEDOMETER PROBLEM (vehicles fitted with an electric speedometer). Needle vibrates or oscillates or no needle movement and total mileage recorder does not operate. Check that the system connectors are engaged correctly. Take care not to damage the connectors during checks.
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There is an airbag readinesslight on the instrument panel, which shows “AIR BAG’ on it. The system checks the airbag’s electrical system for malfunctions. The light tells you if there is an electrical problem.See “Air Bag Readiness Light” in Index for more the information. When should an air bag inflate? The air bag is designed to inflate in moderate to severe frontal or near-frontal crashes. The airbag will inflate only if the impact speed is above the system’s designed “threshold level.” If your vehicle goes straight into a wall that doesn’t move or deform, the threshold level is about 9 to 15 mph ( 14 to 24 km/h).
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