Fiat Marea & Marea Weekend 1996-2002 Workshop Repair & Service Manual [COMPLETE & INFORMATIVE for DIY REPAIR] ☆ ☆ ☆ ☆ ☆
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Fiat Marea & Marea Weekend 1996 1997 1998 1999 2000 2001 2002
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This highly detailed workshop service repair manual for download contains virtually everything you will ever need to repair, maintain, rebuild, refurbish or restore Your Fiat Marea & Marea Weekend 1996-2002 (ALL MODELS ARE COVERED). All diagnostic and repair procedures and gives you access to the same information that professional technicians and mechanics have. You can view and print out the complete repair procedures with this workshop service repair manual Download – you do not need to be skilled with a computer.
BUTTERFLY VALVE CASE (54 CFA 26)
The butterfly valve case is responsible for metering the quantity of air supplied to the engine (and thus controlling engine power output) according to accelerator position determined by the driver. The butterfly valve case is fastened to the intake manifold by four screws. The throttle is opened by a linkage with configuration designed to open the throttle by a small amount when the pedal is hardly pressed (provided pedal travel remains the same) and open it by large amounts when the pedal is pressed down further.
With the pedal fully released (engine in over-run or idling), the additional air required is supplied by an engine idle adjustment solenoid. Under these conditions, the throttle opening lever comes into contact with an anti-bind screw, which prevents the throttle becoming locked in closed position.
To prevent the build-up of ice around the throttle and the hole leading to the PCV valve, the butterfly valve case is heated by directing a small amount of coolant from the engine thermostat around a chamber inside the case. The oil vapor recirculation system PCV valve and throttle position sensor are also fitted on the butterfly valve case.
ABSOLUTE PRESSURE SENSOR
The sensitive element is enclosed within a plastic container (1) and consists of a Wheatstone
bridge screen printed to a very fine circular ceramic plate (diaphragm) fitted to the underside of a ring mount.
The diaphragm separates two chambers: a vacuum is set up in the bottom sealed chamber while the top chamber communicates with the intake manifold indirectly through a rubber pipe (3).
When the engine is off, the diaphragm bends according to atmospheric pressure level. Exact information on altitude is therefore provided when the key is inserted.
When running, the engine sets up a vacuum that gives rise to a mechanical effect on the sensor diaphragm, which bends to alter the resistance level.
Because the electrical supply is maintained constant (5 V) by the control unit, when the resistance is altered, the output voltage changes in proportion to the vacuum in the intake manifold (2).
The pressure is calculated according to throttle angle and rpm level.
If the butterfly valve position sensor is faulty, a fixed calibration value is assigned (about 630 millibars).
Mixture self-adaption is inhibited. Lambda probe test is inhibited.