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Unit 5 Automatic Transmission Diagnosis System 1. Diagnostic Function( 1) Check " N" range lightThe " N" range light flashes once per second if there is an abnormality in any of the itemsin the table below which are related to the A/ T system. Check for diagnostic trouble codes the" N" range light is flashing once per second." N" range light flashing items ;O)lnput shaft speed sensor.OOutput shaft speed sensor.($)Each solenoid valve.OGear incorrect ratio.GA/ T control relay system.(2) On-board diagnosticsThe powertrain control module ( PCM) monitors its input/ output signals ( some signalsall the time and others under specified conditions ) . When an irregular signal is initiallymonitored, the PCM decides that a malfunction has occurred and records the occurrence thathas diagnostic trouble code. There are 26 diagnostic items. The diagnostic results can be readwith a scan tool. Diagnostic trouble codes are kept in memory by direct battery feed. The codesare retained in memory even if the ignition switch is in the " LOCK " ( OFF) position.Diagnostic trouble codes will, however, be erased when a battery terminal or the PCMconnector is disconnected. In addition, the diagnostic trouble code can also be erased by scantool ( .Note: If a sensor is disconnected when the ignition switch is in the " ON" position , adiagnostic trouble code is stored in memory. In this case, erase the DTC using scan tool(MUT-III).(3) How to connect the scan tool ( shown in Fig. 2-5-1 )Note: To prevent damage to scan tool, always turn the ignition switch to theLOCK" ( OFF) position before connecting or disconnecting scan tool.OEnsure that the ignition switch is in the " LOCK" ( OFF) position.Start up the personal computer.Connect special tool to the personal computer.Connect special tool to the data link connector.Turn the power switch of special tool to the " ON" position.start the MUT-III system on the personal computer.96 eFig. 2 -S -l 'la ( )I —data link ) 3—personal( 4) HOW to read and erase trouble codesu:onnect scan tool to the data link connector.OTurn the ignition switch to the " ON" position. OSelect " Interactive Diagnosis" from the start-up screen. @Select System select"(5)Choose "ELC-A/ T" from the "POWER TRAIN" tab. OSe1ect "MITSUBISHI"(t)Select " Diagnostic Trouble Code"a DTC is set, it is shown.O'Choose " Erase DTCs" to erase the DTC.(S) HOW to read data list(DConnect scan tool to the data link connector.•Turn the ignition switch to the "ON" position. OSelect " fnteractive Diagnosis" from the start-up screen. OSelect" System select""ELC-A/ T" from the "POWER TRAIN" tab.9 ChooseOSe1ect " MITSUBISHI" .ØSelect " Data List".(OChoose an appropriate item and select the " OK" button(6) HOW to perform actuator test(DConnect scan tool to the data link connecter.(2Turn the ignition switch to the " ON" position.ØSelect " Interactive Diagnosis" from the start-up screen.@Select " System select"(5Choose "ELC-A/ T" from the "POWER TRAIN" tab.@Select "t)Select " Actuator Test"@Choose an appropriate item and select the " OK" button.( 7 ) Fail-safe/ backup functionWhen a malfunction Of a main sensor or actuator is detected by the PCM. the transmission is controlled by pre-set control logic to maintain safe conditions for driving. following table shows how the fail-safe/ backup function affects vehicle driveability and operation.ItemShaftOutput shanReduction solenoidelutehA/ T relayin PCM2. Diagnostic Trouble CodeM Fl DiagTrouble codeW? 13Control Defaun Duringholds the or 2m:' on" N • light aA/ T relay is off range light Thewill in 3"' thene A/ T relay is witch"' off. "yin 3rd isDiagn€Mic ItemcircuitTransmission fluid'0712Body Electrical SystemUnit I Instrument PanelThe instrument panel has many indicators and gauges to give you important information about your vehicle, shown in Fig. 3-1-1.6189 10153-1 -l pan e" (I ; ail; 5—1eft light( ;; enginev •high indkatør( : 9—SRS SRSindicator( Il—right signal; fuel indicator( ;15—ABS ABS ;IO—TC.S ) ; 17—fuel ;I. Indicators(l) Low Oil pressure Indicator (Shown in Fig. 3-1-2)It is an engine oil pressure warning light. "'e light should come on every time when your ignition key is turned to ON or START, and should go off when the engine starts. If the lightStays on or comes on while the engine is running, you have lost oil pressure and continued operation will cause severe engine damage. Stop and check.(2) Charging System Indicator ( Shown in Fig. 3-1-3)This light comes on every time when you turn your ignition key to ON or START. "telight should go Off when the engine starts and the alternator begins to charge. If the light stays on or comes on when the engine is running, have the charging system checked as soon as possible.Fig. 3-1-2Fig,(3) Parking Brake and Brake System Indicator ( Shown in Fig. 3-14)This light has two functions:Olt lights as a reminder that you have set the parking brake. On some types, the lightgoes on briefly when the ignition switch is turned to START with the parking brake released. Driving with the parking brake set can damage the brakes and tyres, and cause the ABS to turn off.can indicate the brake fluid level is IOW if it remains light after you release theparking brake or comes on while driving. This is normally due to worn brake pads. Have your dealer check the braking system for worn pads or fluid leaks.Vis. 3-1-1(4) Seat Indicator and Buzzer Shown in )This indicator lights when you turn the ignition switch to ON. Il is a reminder to you andyour passengers 10 protect yourselves by fastening the Seat belts. A beeper HISO sounds if you have not fastened your Seat and it Will Stop after a few seconds. But the light Stays on until you do. Both the light and the beeper stay off if you fasten your seat belt before turning on the ignition.(5) Check Engine Indicator (Shown in Fig. 3-1-6)This light comes on when the Engine Electronic Control System is not working properly.Take vehicle to the dealer immediately.(6) Anti-lock Brake System (ABS) Indicator ( Shown in Fig. 3-1-7)This light normally comes on when vou turn the ignition switch to ON and goes off afterthe engine starts. If it comes on at other time, there is a problem in the ABS. If this happens , take the car to your dealer to have it checked. With the light on, your car still has normal braking ability but no anti-lock.Fig.CHECKEig_ABSFie. 3-1-7( 7 ) Door and Brake Lamp Monitor ( Shown in Fig. 3-1-8)ne light comes On in this display if the boot or any is not closed tightly.If a brake light does not work, the BRAKE LAMP indicator comes on when you push downthe brake pedal with the ignition switch on. A burned out brake light is a hazard When drivers behind you cannot be told that you are braking. Have your brake light repaired right away. All the lights in the monitor display come on for a few seconds when you turn the ignition switch to ON.(8) Washer Fluid Light ( Shown in Fig. 3-1-9)nis light illuminates when there is less than a quarter of the container Of washer fluidleft. Add Washer Fluid.(9) Low Fuel Indicator ( Shown in Fig. 3-1-10)This light comes on when your fuel gauge indicates approximately I '8 fuel Of a tank. Fillup the tank With fuel.( 10) Cruise Control Indicator (Shown in Fig. 3-1-11 )This light comes on when you set the cruise control. When you tap the brake or clutch pedal, or press the SET and RESUME buttons at the same time, the CRUISE CONTROLlight on the instrument panel Will go out and the car will begin to slow down. You can use the accelerator pedal in the normal way.Fig. 3-1-8his.Fig. 3-1-10( I ) Traction Control System ( TCS) Indicator (Shown in Fig. 3-1-12)The TCS light normally comes on when you turn the ignition switch to ON and g«ws offafter 'he engine starts. If it doesn t, or it stays on after possible engine starts, there is a problem with the Traction Control System. Check it as soon as possible.( 12) Supplemental Restrain System ( SRS) Indicator (Shown in Fig. 3-1-13)The warning light goes on to alert the driver of trouble in the SRS system when a malfunction is detected in the center airbag sensor assembly self-diagnosis. In normal operating conditions when the ignition switch is turned to the ON position, the light goes on for about 6 seconds and then goes Off.CRUISECONTROLFig. 1-1-112. Gauges( I ) Temperature GaugeTCSFig. 3-1-12SRSFig. 3-1-13It shows the temperature Of the coolant of the engine. During normal operation, thepointer should rise from C ( Cold) to the NORMAL band. When you are driving in heavytraffic or uphill in hot weather, the pointer may reach the top Of the NORMAL band. If it reaches the H ( Hot) band, the engine is over heating and may cause engine damage. Stop and check.(2) Fuel GaugeIt shows how much fuel you have in the fuel tank. For fuel gauge proper operation. the ignition switch must be in the OFF position I-w•fore you add fuel to the fuel tank. It is accurate when the ear is on level ground. It may vary slightly while the vehicle is in motion.( 3 ) SpeedometerIt shows your speed in kilometers per hour ( km On some types , when the speedover approximately 120 km 'h, a buzzer sounds.(4) TachometerIt shows the engine speedin revolutions per minute ( rpm) . To protect the engine fromdamage. never drive with the tachometer needle in the red(5 ) OdometerThis meter shows the total number Of kilometers your car has been driven. The trip odometer shows the number Of kilometers or miles driven since you last reset it. To reset it, press reset button to return the trip odometer to zero.Unit 2 Air Conditioning SystemAir conditioning system has such functions as follows:( ) Keep us hot day.(2 ) Get us wann in cold day.(3) Make the air of the car's interior clean and dehumidify.(4) outside air enter the ear at the desired speed.Air conditioning system mainly consists Of ( with a magnetic clutch ) ,condenser and electric fan, receiver, blower unit, cooling unit ( With an evav»rator and an valve ) , heater unit, heater control assembly, A/C idle-up device,suction hose, discharge hose, air conditioning relay and sensors, etc. Its electrical control parts location is shown in Fig. 3-2-1.It 1021 23 22 21Air ( ); switch( )pressure ) ;8—-engine NO. relay NO. 2 relay13—air ;14—air ; ;; 17—air cleaner( ;18—ai' inlet ; relay( ) ; 21 mix( ; 24—air W'tfL) ;) hin ; valve( ) ;29—1— valve( ) ; 30—A/C )In recent years R-134a ( CH.F-CFI) is widely used as instead Of R-12 in airconditioning system. It has more advantages than R-12. It does not deplete the ozone Which helps to protect us from the ultraviolet from the sun, and its temperature is muchhigher than that of R-12.The cooling process of the air conditioning system is shown in Fig. 3-2-2. The compressor sucks the refrigerant IOW temperature and low pressure) from an evaporator and changesit into high temperature and high pressure conditions. TTten refrigerant is forced to pass the condenser, in which the heat is dissipated to the air by the electric fan. fie temperature of the refrigerant drops down and its gas condenses to liquid state. When the refrigerant passes the receiver , it is dried, and the fine water drops are left. When the refrigerant passes the expansion valve in the cooling unit, its temperature and pressure corne down, Under low pressure, the refrigerant and the evaporator sucks the heat from the hot air of thecar's interior, and makes it cool, and then sends it back into the car ' s interior. Thus, the refrigerant is cilvulated continuously in air conditioning lines. The driver feels much more comfortable even in hot weather While driving.temperature and the speed Of the air which enters the car are by using theblower speed control switch and mode control switch. This is also onc of the main tasks of the air conditioning system. When AUTO switch is on, the desired temperature is set using the TEMP switch. According to the input signals from sensors and the temperature setting, the air conditioner control ECU determines the air flow volume and outputs signals to the power transistor. When it recæives signals from the ECU, the power transistor increases or reduces the blower motor speed to control the air flow volume.In order to protect the air conditioning system, the degree of cooling is controlled by A/C amplifier. Several sensors such as engine speed sen#'r, engine coolant temperature sensor, evaporator temperature sensor, room temperature sensor, and ambient temperature sensor, etc. , input signals to the A/C amplifier. When the speed of engine or the temperature of engine coolant is low to some degree, the A/C amplifier receives signals from sensors and outputs signals to the compressor magnetic clutch to stop the compressor working.'Ille pressure in the air conditioning piping has great influence on the parts In the piping.Too high or too low prssure is harmful to them. There are several switches to control the system pressure such as high pressure switches and low pressure switches. When the pressure in piping is too high or too low, these switches send signals to A/C amplifier which can control and regulate the degree of cooling to protect the system.Fig. 3-2-2 of Air Condi'ion( side ( ) side (air ( ) ; ( ;air ( (Refrigerant for automobile air conditioners is believed dangerous when it releases. In high temperature or exposed to naked name, the refrigerant will produce a poisonous gas which can suffocate you. nerefore , it is necessary to prevent release of refrigerant to the atmosphere when servicing the air conditioner and to follow the correct service prcw:ess and notices about it.1. Handling precautions for refrigerant( I ) Do not handle refrigerant in an enclosed area or near an open flame.(2) Always 'Mear eye protection.(3) Be careful that liquid refrigerant does not get in your eyes or on your skin.If liquid refrigerant gets in your eyes or on your skin :0) Wash the area with lots Of cool water.Caution: DO not rub your eyes or skin.Apply clean to the skin.Co immediately to a or hospital for professional treatment.Caution : DO not attempt to treat yourself.2. Handling precautions for refrigerant container( ) Never heat container or expose it to naked flame.(2) Be careful not to drop container and not to apply physical shocks to it.3. Handling precautions for gas-cylinder type gas leak tester(l ) Before using tester make sure that there are no flammable substances nearby.(2) Be careful not to inhale poisonous gas.If refrigerant gas comes in contact with flame , a poisonous gas Will be produced.During leak tests, do not inhale any gas.4. Precautions when replacing parts in refrigerant lines( I ) Using a recovery machine, recover refrigerant in system before removing parts. Notice : DO not release refrigerant to the atmosphere.( 2) Insert plug immediately in the disconnected parts to prevent the entry Of moisture and dust.(3) Do not remove plug from new parts until immediately before installation.(4) Do not use burner for bending or lengthening operations on tube.If the lubes are heated with a burner, a layer Of oxidation forms inside the tube,causing the same kind of trouble as an accumulation of dust.(5) Discharge gas in new compressor before installing it.If the gas in new is not discharged first, compressor oil Will spray out withgas when the plug is removed.(6) Tighten connecting parts securely.OSecurely tighten the connecting parts to prevent leaking of refrigerant gas.2Apply a few drops of compressor oil to O-ring for easy tightening and toprevent leaking of refrigerant gas.Wrightcn the nuts using two wrenches to avoid twisting the lube.@ITighten the O-ring fittings or the bolted type fittings to the specified torque.5. Precautions when charging refrigerant( I ) Do not OV:rate compressor without enough refrigerant in refrigerant cycle.If there is not enough refrigerant in the refrigerant cycle, oil lubrication will be insufficient and compressor burnout may occur, so take eare to avoid this.(2) Do not open high pressure valve Of manifold with compressor operating.If the high pressure valve is opened, refrigerant Will flow in the reverse direction and could cause the charging cylinder to So open and close the low pressurevalve only.(3) Be careful not to with refrigerant in system.If refrigerant is overcharged. it will cause trouble such as insufficient cooling, poorfuel economy, engine overheating, etc.。