8.7. Information sensors and actuation mechanisms - the general information, check of serviceability of functioning, removal and installation
Details of installation of the IAC servomotor
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In order to avoid failure of ESM when performing of the checks described below use only the digital voltmeter with high (over 10 megohms) an impedance! |
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The car equipped with the OBD-II system should be driven away on car repair shop for reading of codes of malfunctions with use of the special scanner. There are some checks (connected with identification of causes of failures at start of the engine) which the owner of the vehicle can independently execute, in all other cases the car should be driven away in car service. |
Oxygen sensors
General information
O2 sensors, or l-probes trace percentage of oxygen in the fulfilled engine gases. The molecules O2 which are present at system of release, reacting with a sensitive element of the sensor, force the last to develop alarm tension. Signal amplitude, depending on concentration of oxygen can make from 0 to 1 V, and the signal lower than 0.4 In testifies to the high content of O2, - the grown poor air-fuel mix, over 0.6 In, - about low (the enriched mix). ESM continuously traces the signal arriving from the oxygen sensor, and on the basis of the arriving data makes the corresponding correction of structure of air-fuel, trying to support him at optimum level (14.7 parts of air on 1 part of fuel, - stoichiometric number) to which there corresponds the indication of the oxygen sensor 0.4 ÷ 0.6 B. Correction of composition of mix is made due to management of duration of time of opening of injectors of injection. The oxygen sensor begins to develop alarm tension only after it is heated-up up to the normal working temperature making about 320 °C. In a look told, in the course of warming up of the ESM engine works in the mode of the opened contour.
On the models equipped with system of onboard self-diagnostics OBD-II two oxygen sensors, one of which is established ahead of the catalytic converter, another - behind are usually provided that allows the module of management to maintain efficiency of functioning of the catalyst at the maximum level. For acceleration an exit of sensors in an operating mode they can be equipped with electric heating elements.
Check
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Connection of the scanner by piercing of isolation of wires is fraught with damage of an electrical wiring, - enter measuring instrument probes into plugs from a reverse side of the socket! |
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1. Do not forget to check serviceability of a condition of all oxygen sensors which are a part of system.
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Access to oxygen sensors is usually complicated. Be careful, - you remember that components of system of release can remain hot during even long time after a stop of the engine and pressing to their surface of plaits of an electrical wiring can lead to destruction of their isolation. Try to make, whenever possible, check of components of system with use of the special scanner allowing to reveal changes of alarm tension within thousand shares of volt. |
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2. Disconnect an electrical wiring from the sensor.
3. Measure resistance between the sensor PWR and GRD plugs. If the result of measurement differs from the nominal rate stipulated by standard requirements (6 Ohms at a temperature of 20 °C), therefore the heating element of the sensor is faulty and assembly is subject to replacement.
4. Restore initial connection of an electrical wiring and start the engine. Connect the digital voltmeter between the sensor socket HO2S and SIG RTN (GND) plugs, - if fluctuations of indications of the measuring instrument happen insufficiently quickly, or exceed the limit of the range of nominal range (0.01 ÷ 1.0 B), replace the sensor. |
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Removal and installation
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| 1. Disconnect a negative wire from the battery.
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If the stereosystem established on the car is equipped with a security code before disconnecting the battery make sure that you have the correct combination for input of the audio system in action! |
2. The car also establish to Poddomkratta it on props.
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3. Mark wires and disconnect the oxygen sensor from the main braid of an electrical wiring of the engine. |
4. By means of a special key turn out the sensor and remove it from the car.
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5. Estimate a condition of the deposits covering a working element of the oxygen sensor.
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6. Before installation the sensor should be oiled getting.
7. Screw the sensor on the regular place and tighten it with the required effort (37 ÷ 45 H • м).
8. Restore initial connection of an electrical wiring.
9. Lower the car on the earth and connect a negative wire to the battery. |
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Servomotor of system of stabilization of turns of idling (IAC)
General information
The servo-driver of the IAC system is carried out on a step electric motor with food on a direct current. The sensor which is built in assembly of the servomotor continuously traces position of the drive and gives the relevant information on PCM exercising the general control of functioning of system of stabilization of turns of idling.
Check
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| 1. Press a stethoscope or the big screw-driver to assembly of the IAC servo-driver. Ask the assistant to include ignition, without starting the engine, - the driving electric motor has to publish several distinct clicks confirming serviceability of a condition of a chain on the site between PCM and the servo-driver of system. Further you pass to check of a condition actually of an electric motor.
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2. Disconnect an electrical wiring from assembly of the servomotor and an ohmmeter in pairs probe plugs 1-2 and 2-3 of the contact socket from the drive (not a plait!). If the result of measurement exceeds the limit of the admissible range (28 ÷ 33 Ohm), replace IAC electric motor. At positive results of the first testing probe plugs 5-4 and 5-6, - the result has to lie within the same range. At negative results of check replace the servomotor. |
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Removal and installation
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| 1. Details of installation of the IAC servomotor are shown on an illustration.
2. Disconnect a negative wire from the battery.
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If the stereosystem established on the car is equipped with a security code before disconnecting the battery make sure that you have the correct combination for input of the audio system in action! |
3. Remove an inlet sleeve of the air cleaner.
4. Disconnect the hoses brought to the IAC servo-driver.
5. Turn out fixing bolts and remove assembly of the IAC servo-driver from the throttle case.
6. Installation is made upside-down, - do not forget to replace sealing laying. |
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Sensor of temperature of cooling liquid of the engine (ECT)
General information
As it is clear from its name, the ECT sensor serves for measurement of temperature of cooling liquid of the engine. On a design the sensor represents a thermistor which resistance changes in inverse proportion to change of temperature. The sensor issues the removed information on PCM which uses the obtained data at corrections of a corner of an advancing of ignition, intensity of a stream of EGR, composition of air-fuel mix and so forth. Two wires on which on it basic tension in 5 Century moves are brought to the sensor. Parameters of an output signal of the sensor are defined by change of resistance of a working element depending on temperature.
Check
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| 1. Merge cooling liquid from the engine, having lowered its level lower than the level of position of the ECT sensor installed on the inlet pipeline.
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2. Disconnect an electrical wiring from the sensor and remove it from the engine.
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3. Lower a working element of the sensor in a vessel with the warmed-up liquid where the thermometer also has to be lowered. |
4. Connect an ohmmeter to the sensor and begin to warm up water, tracing the nature of change of indications of the measuring instrument according to indications of the thermometer. Compare results of measurements to requirements of Specifications (5.1 ÷ 6.5 kOhm at 0 °C; 2.1 ÷ 2.7 kOhm at 20 °C and 0.26 ÷ 0.36 kOhm at 80 °C. The faulty sensor is subject to replacement.
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Alternatively check of the ECT sensor can be made by means of the diagnostic scanner. |
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Removal and installation
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| 1. Disconnect a negative wire from the battery.
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If the stereosystem established on the car is equipped with a security code before disconnecting the battery make sure that you have the correct combination for input of the audio system in action! |
2. Merge cooling liquid from the engine, having lowered its level lower than the level of position of the ECT sensor installed on the inlet pipeline.
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3. Disconnect an electrical wiring from the sensor. |
4. Turn out the sensor and remove it from the engine.
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5. Before installation a carving part of the sensor should be greased with suitable sealant. |
6. Screw the sensor on the regular place and tighten it with the required effort (30 H • м).
7. Fill in in the cooling system necessary amount of mix of the required grade (see the Head Nastroyki and routine maintenance).
8. Connect an electrical wiring to the ECT sensor (track reliability of fixing of the socket).
9. Connect a negative wire to the battery. |
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The sensor of temperature of the soaked-up air (IAT)
General information
The IAT sensor is a part of the sensor of measurement of mass of air (MAF) and serves for control of temperature of the air which is soaked up in the engine. The sensor, as well as the ECT sensor considered above, represents a thermistor with negative temperature coefficient. Uses information of PCM arriving from the IAT sensor at corrections of installations of a corner of an advancing of ignition and composition of air-fuel mix. Besides, this information in a combination with the data arriving from the sensor of pressure is used at calculation by the module of management of mass of the air engine given to cylinders. The working signal is developed by the sensor by transformation of basic 5-votovy tension according to change of resistance of a thermosensitive element of assembly.
Check
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1. The IAT sensor is a part of assembly of the sensor of measurement of mass of air (MAF). |
2. Disconnect an electrical wiring from the MAF sensor.
3. Measure resistance between plugs 4 and 6 (all models except 2.0 l of DOHC)/6 and 8 (model of 2.0 l of DOHC) of the contact socket of the sensor.
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Alternatively check of the IAT sensor can be made by means of the diagnostic scanner. |
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4. Compare results of measurements to requirements of Specifications (5.3 ÷ 6.7 kOhm at a temperature of 0 °C; 2.3 ÷ 3.0 kOhm at a temperature of 20 °C and 0.30 ÷ 0.42 kOhm at a temperature of 80 °C).
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Heating of the sensor can be carried out by means of the household hair dryer. |
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5. The faulty sensor is subject to replacement. |
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Removal and installation
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| The IAT sensor is a part of the MAF sensor, the description of procedures of removal and which installations are given below in the present Section. |
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Sensor of measurement of mass of air (MAF)
General information
The MAF sensor serves for measurement of mass of the air stream which is soaked up in the engine. Information issued by the sensor is used by PCM when determining duration of time of opening of injectors. As a working element ("a hot wire") in the MAF sensor the thin platinum wire which is reeled up on a ceramic pig and filled in with glass is used. Thread heats up to the value exceeding ambient temperature on 200 °C, and the working element is blown by a stream of the air which is soaked up in the engine. The working signal determining temperature of the soaked-up air is removed from a "cold" element of the MAF sensor (IAT sensor).
Basic tension moves on the MAF sensor with PCM, grounding is also organized via the module of management. The sensor returns to the module a signal which amplitude is proportional to current, the working element proceeding through "a hot wire" and providing maintenance of temperature of the last at the set level. Strengthening of an obduv of a working element leads to decrease in resistive resistance of "a hot wire" and keeping of temperature at the previous level requires big current. Amplitude of information impulses of a signal is directly proportional to force of the wire proceeding through a working element and at correct functioning of the sensor has to increase with increase in a consumption of the air which is soaked up in the engine.
Check
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| 1. Having connected a multimeter to a reverse side of plugs of the contact socket, measure MAF sensor tension.
2. At the included ignition (the engine do not start) tension size between the BATT and GND plugs has to make not less than 10.5 Century. If this condition is not satisfied, it is necessary to check a condition of an electrical wiring of contours of giving of food and grounding of the sensor.
3. Now start the engine and measure tension size between the GND and SIG plugs. If the result of measurement makes less than 4.5 In, check a condition of an electrical wiring of contours of food and grounding.
4. Without suppressing the engine, measure the size of alarm tension between the GND and SIG RTN plugs, - if the result of measurement exceeds the limit of the range of 0.34 ÷ 1.96 B, replace the sensor. |
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Removal and installation
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Try not to subject the removed MAF sensor to shock, temperature and chemical influences! |
1. Disconnect a negative wire from the battery.
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If the stereosystem established on the car is equipped with a security code before disconnecting the battery make sure that you have the correct combination for input of the audio system in action! |
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2. Release clamps of fastening of a casing of the air cleaner. |
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3. Weaken a collar of fastening of a final air duct on the throttle case. |
4. Remove a branch pipe of a sapun and disconnect an electrical wiring from the MAF sensor.
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5. Remove a final air duct, then disconnect it from an air cleaner cover.
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6. Give four fixing nuts and remove assembly of the MAF sensor from an air cleaner cover.
7. Installation is made upside-down. |
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The sensor of absolute pressure in the inlet pipeline (MAP)
General information
Information arriving from the MAP sensor is fundamental in process of management of configuration of air-fuel mix. Using data on temperature and relative pressure (data on atmospheric pressure arrive from the BARO sensor) in the inlet pipeline, PCM calculates the current consumption of the air which is soaked up in the engine and on the basis of the analysis of the obtained information defines the amount of the fuel injected into combustion chambers is necessary.
Check
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| 1. By means of a multimeter check tension on the MAP sensor socket (probes of the sensor are entered into contact plugs from a reverse side of the socket).
2. Include ignition (the engine do not start) and make sure that tension between the SIG and GND plugs makes not less than 48 V, otherwise check a condition of an electrical wiring of contours of giving of food and grounding, make necessary recovery repair.
3. Start the engine and measure tension between the socket GND and SIG RTN plugs. If the result of measurement exceeds the limit of admissible range (0.8 ÷ 2.4 B), replace the sensor.
4. At positive results of the last check repeat measurement, having sharply squeezed out at the same time the accelerator pedal, - the indication has to rise to 2.4 B and be stabilized at this level. The faulty sensor is subject to replacement. |
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Removal and installation
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| 1. Disconnect a negative wire from the battery.
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If the stereosystem established on the car is equipped with a security code before disconnecting the battery make sure that you have the correct combination for input of the audio system in action! |
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2. Disconnect an electrical wiring from the MAP sensor. |
3. Turn out bolts of fastening of the sensor and remove it from the inlet pipeline.
4. Installation is made upside-down. |
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Sensor of provision of a butterfly valve (TPS)
General information
In a basis of a design of the sensor of provision of a butterfly valve (TPS) the potentiometer, i.e. the resistor which resistance changes as a result of mechanical movement of mobile components is put. The sensor is mechanically connected to an axis of a butterfly valve and develops the alarm tension proportional to the current size of resistance of a potentiometer determined by position of the gate in the throttle case. The signal from the sensor is given for PCM which on the basis of the analysis of the arriving data defines situation and the direction of the movement of the gate and as appropriate corrects composition of air-fuel mix, installation of a corner of an advancing of ignition and intensity of admixture of the fulfilled gases (EGR).
The module of management (PCM) organizes giving on TPS of basic tension (5 V) and grounding. Amplitude of a working signal of the sensor is defined by position of the toddler of the potentiometer connected with an axis of a butterfly valve and on single turns has to make about 0.9 Century.
Check
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Adjustment of TPS is not represented possible, in case of violation of serviceability of functioning the sensor has to be replaced. |
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1. Start and by means of the digital voltmeter measure tension between the SIG RTN and GND plugs from the back party of the contact socket of the sensor, - at single turns of the indication have to lie within the range of 0.2 ÷ 1.4 Century. |
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2. Slowly transfer a butterfly valve to completely open situation, - tension has to increase also slowly up to 4.8 Century. |
3. If the signal is absent, check serviceability of giving for the sensor of basic tension (5.0 B) and potential of grounding (less than 0.3 In), in case of need make the corresponding recovery repair of an electrical wiring / replace PCM. If food and grounding are normal, replace the sensor.
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Alternatively check of TPS can be made by means of the diagnostic reader of skanerny type. |
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Removal and installation
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| 1. Disconnect a negative wire from the battery.
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If the stereosystem established on the car is equipped with a security code before disconnecting the battery make sure that you have the correct combination for input of the audio system in action! |
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2. Disconnect an electrical wiring from the sensor of provision of a butterfly valve.
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3. Turn out two fixing screws and dismantle TPS from an axis of a butterfly valve.
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4. Installation is made upside-down, - track correctness of input of the sensor in gearing with a gate axis. |
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Sensor of position of the camshaft (CMP)
General information
On the basis of the analysis of information of PCM arriving from the CMP sensor defines position of the piston of the first cylinder of the engine and uses the obtained data at calculation of phases of gas distribution. At admissions of signals the CMP module of management carries out injection of fuel in cylinders according to results of the last successful calculation that excludes probability of spontaneous stops of the engine in case of a CMP sensor exit from an operation (efficiency of return of the power unit can decrease at the same time considerably).
Check
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| The sensor develops a signal of alternating current which frequency is proportional to the frequency of rotation of the camshaft of the engine. Check of the sensor can be made only with use of the expensive diagnostic equipment in view of what its performance will be reasonable to charge to specialists of car service of the Mitsubishi company. Monitoring of functioning of the CMP sensor can be made by means of the diagnostic reader of skanerny type, - follow instructions of manufacturers of the device. |
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Removal and installation
Models of 1.6 l, 2.0 l of DOHC and 1.8 l since 1997 of the issue.
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| 1. Disconnect a negative wire from the battery.
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If the stereosystem established on the car is equipped with a security code before disconnecting the battery make sure that you have the correct combination for input of the audio system in action! |
2. Disconnect an electrical wiring from the sensor and remove an assembly arm of a plait of wires from the throttle case.
3. Turn out fixing screws and remove the sensor from the engine.
4. Installation is made upside-down, - track correctness of laying of an electrical wiring and reliability of tightening of fixture. |
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Models of 1.5 l, 2.4 l, 3.0 l of SOHC, 3.5 l and 1.8 l of 1993 ÷ 1996 of the issue.
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On these models the CMP sensor is built in the ignition distributor. The description of procedures of removal and installation of the distributor see in the Head Elektrooborudovaniye of the engine of the present manual. |
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Models of 3.0 l of DOHC
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1. Details of installation of the CMP sensor on models of 3.0 l of DOHC are shown on an illustration. |
2. Disconnect a negative wire from the battery.
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If the stereosystem established on the car is equipped with a security code before disconnecting the battery make sure that you have the correct combination for input of the audio system in action! |
3. Take off a gas-distributing belt (see the Head Dvigatel). Disconnect an electrical wiring from the CMP sensor.
4. Release fixing bolts and remove the CMP sensor from the car.
5. Installation is made upside-down. |
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Sensor of a situation/angle of rotation of a bent shaft (CKP)
General information
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| Determines exact position of the piston of each of engine cylinders by the pulse signals of PCM arriving from the CKP sensor. On the basis of results of the analysis of the obtained information the module of management defines the optimum moments of injection and ignition of fuel. |
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Check
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| As well as in case of CMP performance of check of the CKP sensor should be charged to specialists of car service. It is alternatively possible to use the diagnostic scanner. |
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Removal and installation
Models of 2.0 l of SOHC and 1.5 l of 1990 ÷ 1996 of the issue.
Models of 1.6 l and 2.0 l of DOHC
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1. Details of installation of the CKP sensor on these models are shown on an accompanying illustration. |
2. Disconnect a negative wire from the battery.
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If the stereosystem established on the car is equipped with a security code before disconnecting the battery make sure that you have the correct combination for input of the audio system in action! |
3. Disconnect an electrical wiring from the CKP sensor and remove an assembly arm of a plait of wires from the throttle case.
4. Turn out fixing screws and remove the sensor from the engine.
5. Installation is made upside-down, - track correctness of laying of an electrical wiring and reliability of tightening of fixture. |
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Models of 1.8 l, 2.4 l, 3.0 l and 3.5 l since 1997 of the issue.
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| 1. Disconnect a negative wire from the battery.
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If the stereosystem established on the car is equipped with a security code before disconnecting the battery make sure that you have the correct combination for input of the audio system in action! |
2. Take off a gas-distributing belt (see the Head Dvigatel).
3. Disconnect an electrical wiring from the CKP sensor.
4. Turn out fixing boats and remove the CKP sensor from the car.
5. Installation is made upside-down. |
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