Honda Civic/Acura Integra
since 1994 release
Repair and operation of the car
+ Cars of the Honda Civic and Acura Integra brand
+ Maintenance instruction
+ Routine maintenance
+ Cooling system and heating
+ Power supply system and release
+ Engine electric equipment
- Control systems of the engine
System of onboard diagnostics (OBD) - the principle of functioning and codes of malfunctions
Removal and PCM/ECM installation
Check of serviceability of a state and replacement of the sensor of provision of a butterfly valve (TPS)
Check of serviceability of a state and replacement of the sensor of absolute pressure in the pipeline (MAR)
Check of serviceability of a state and replacement of the sensor of temperature of the soaked-up air (IAT)
Check of serviceability of a state and replacement of the sensor of temperature of cooling liquid of the engine (EST)
Check of serviceability of a state and replacement of the sensor of VMT/provision of a cranked shaft / situation of pistons in cylinders of the engine (TDC/CKP/CYP)
Check of serviceability of a state and replacement of the sensor of fluctuations of a bent shaft (CKF)
Check of serviceability of a state and replacement of the detector of control of electric loadings (ELD)
Check of serviceability of a state and replacement of the sensor switch of pressure in system of hydrostrengthening of a wheel (PSP)
Check of serviceability of a state and replacement of the oxygen sensor (l-probe)
Check of serviceability of a state and replacement of the sensor of a detonation
Check of serviceability of a state and replacement of the sensor of speed of the movement of the car (VSS)
System of stabilization of turns of idling - the general information, check of a state and replacement of the IAC valve
Check of serviceability of a state and replacement of the thermosensitive valve of turns of bystry idling (FIT)
System of a perepuskaniye of the soaked-up air - the general information, check of a state and replacement of a diaphragm of the IAB valve
System of the operated ventilation of a case (PCV)
System of recirculation of the fulfilled gases (EGR) - the general information, check of a state and replacement of components
System of catching of fuel evaporations (EVAP) - the general information, check of a state and replacement of components
The catalytic converter - the general information, check of a state and replacement
+ Gear shifting box
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Onboard electric equipment
System of onboard diagnostics (OBD) – the principle of functioning and codes of malfunctions
Data on diagnostic units
Check of serviceability of functioning of components of systems of injection and decrease in toxicity of the fulfilled gases is made by means of the universal digital measuring instrument (multimeter). Use of the digital measuring instrument is preferable for several reasons. First, on analog devices it is rather difficult (sometimes, it is impossible), to define result of the indication to within the 100-th and thousand shares while at inspection of the contours including electronic components in the structure, such accuracy becomes particularly important. The second, not less important, the fact that the internal contour of a digital multimeter, has rather high impedance is the reason (internal resistance of the device makes 10 million Ohms). As the voltmeter is connected to the checked chain in parallel, the accuracy of measurement of subjects is higher, than smaller parasitic current will pass through actually device. This problem is not essential at measurement of rather high values of tension (9÷12 of V), however becomes vital at diagnostics of the elements giving low-voltage signals, such as, for example, oxygen sensor where it is about measurement of shares of volt.
The most convenient device for diagnostics of control systems of the engine of modern models of cars are manual readers of skanerny type (see an illustration below). Scanners of the first generation serve for reading of codes of malfunctions of the OBD-I systems. Before application the reader should be checked for compliance of model and year of release of the checked car. Some scanners are multipurpose, at the expense of a possibility of change of a cartridge depending on model of the diagnosed car (Ford, GM, Chrysler, etc.), others are tied to requirements of the regional authorities and intended for use in certain regions of the world (Europe, Asia, the USA, etc.).
With introduction to production to meeting requirements of the last legislations for environmental protection of system of onboard diagnostics of new generation (OBD-II) readers of a special design began to be issued. Some producers marketed the scanners intended for use by amateur mechanics in house conditions – ask in shops of automobile accessories.
General description of the OBD system
Models 1994 and 1995 of of the issue are completed with system of onboard diagnostics of the first generation. Since 1996, the Honda Motors company marketed the models equipped with the systems of self-diagnostics of the second generation which are answering to norms of CARB and ERA and received the name OBD-II. Several diagnostic devices making monitoring of separate parameters of systems of decrease in toxicity and fixing the revealed refusals in the processor memory in the form of individual codes of malfunctions are a part of system. The system makes also check of sensors and actuation mechanisms, controls operational cycles of the vehicle, provides a possibility of freezing of parameters and cleaning of the block of memory.
Data read-out of the processor memory of OBD-II is made by means of the special scanner connected to the 16-contact diagnostic socket of reading of the database (DLC) located under the dashboard from the driver's party of the car. All models of cars of the considered brands, since 1996 the issue are equipped with system of self-diagnostics of the second generation OBD-II. A basic element of system is the onboard processor called by the electronic module of management (ESM), or the module of management of the power (RSM).
ECM/PCM is a brain of a control system of the engine. Basic data arrive on the module from various information sensors and other electronic components (switches, the relay, etc.). On the basis of the analysis of the data arriving from information sensors and according to the basic parameters put in the processor memory, ECM/PCM develops commands for operation of various operating relays and actuation mechanisms, carrying out thereby adjustment of working parameters of the engine and providing maximum efficiency of its return at the minimum fuel consumption.
Special guarantee certificates with the extended validity extend to service of components of a control system of engine/decrease in toxicity of the fulfilled gases. It is not necessary to make attempts of independent performance of failure diagnostics of ECM/PCM or replacement of components of system, to an exit of terms of guarantee certificates, – address experts company service center of the Honda company.
The warmed-up oxygen sensors (HO2S) – the Sensor develops a signal which amplitude depends on the content of oxygen in the fulfilled gases of the engine and external air.
Sensor of provision of a bent shaft (ICR) - The sensor is used in systems of self-diagnostics of the first generation (OBD-I) and informs ECM/PCM on the provision of a bent shaft and turns of the engine.
Sensor of VMT/provision of a cranked shaft / situation of the piston (TDC/CKP/CYP) – This sensor is used in systems of the second generation OBD-II. On the basis of the analysis of information of ECM/PCM arriving from the sensor defines position of the piston of the first cylinder, defines the moments of injection of fuel and ignition.
Sensor of fluctuations of a bent shaft (CKF) – The sensor monitors changes in the frequency of rotation of a bent shaft. If change of turns of the engine exceeds the limit of admissible range, the corresponding signal regarded by the module as the certificate of the admission of ignition is given for ECM/PCM.
Sensor of temperature of cooling liquid of the engine (EST) – On the basis of information of ECM/PCM arriving from the sensor carries out necessary correction of composition of air-fuel mix and a corner of an advancing of ignition, and also controls work of the EGR system.
The sensor of temperature of the soaked-up air (IAT) – ECM/PCM uses information arriving from the IAT sensor at corrections of a stream of fuel, installations of a corner of an advancing of ignition and management of functioning of the EGR system.
Sensor of provision of a butterfly valve (TPS) – The sensor is located on cases of a throttle and connected to an axis of a butterfly valve. Determines the angle of opening of a butterfly valve (is operated by the driver from the accelerator pedal) by amplitude of the given TPS of a signal of ECM/PCM and as appropriate corrects supply of fuel to inlet ports of combustion chambers. The failure of the sensor, or weakening of its fastening leads to interruptions of injection and violations of stability of turns of idling.
The sensor of absolute pressure in the pipeline (MAR) - The sensor controls the changes of pressure in the inlet pipeline connected with changes of turns and loads of the engine, transforming the obtained information to an amplitude signal. ECM/PCM uses information delivered by the sensor at corrections of supply of fuel and installations of a corner of an advancing of ignition. Range of change of an output signal of the sensor makes from 1.0÷1.5 B at the closed butterfly valve (deep depression), to 4.0÷4.5 B at completely open gate (low depression). The sensor is located also on throttle cases.
Sensor of speed of the movement of the car (VSS) – As appears from its name, the sensor informs ECM/PCM on the current speed of the movement of the car.
Pressure sensor in the fuel tank - the Sensor is a compound component of system of catching of fuel evaporations (EVAP) and serves for tracking of pressure of vapors of gasoline in a tank. On the basis of information of ECM/PCM arriving from the sensor issues commands for operation of electromagnetic valves of a purge of system.
Sensor switch of pressure of system of hydrostrengthening of a wheel (PSP) – On the basis of information of ECM/PCM arriving from the sensor switch provides increase in turns of idling due to operation of the IAC sensor for the purpose of compensation of the increasing loads of the engine connected with functioning of the steering hydraulic booster.
The detonation sensor - the Sensor reacts to change of level of the vibrations connected with detonations in the engine. On the basis of information of ECM/PCM arriving from the sensor carries out the corresponding correction of a corner of an advancing of ignition.
Transmission sensors – In addition to data of VSS ECM/PCM obtains also information from the sensors placed in the transmission, or connected to it. Are among such sensors: the turbine shaft RPM meter, the sensor of temperature of ATF and the sensor of the chosen transfer.
The sensor switch of management of inclusion of a clutch coupling of the conditioner of air – When giving power supply from the battery to the electromagnetic valve of the K/V compressor the corresponding information signal arrives on ECM/PCM which regards it as the evidence of increase of load of the engine and as appropriate corrects turns of its single course.
Main PGM-FI relay (relay of the fuel pump) – ECM/PCM makes activation of the relay of the fuel pump when turning the ignition key in situation START or RUN. At inclusion of ignition activation of the relay provides rise in pressure in a power supply system. The relay is in the assembly block of distribution of food in a motive compartment of the car. The description of procedures of check and replacement of the fuel pump is provided in the Head of the Power supply system and release.
Fuel injection injectors – ECM/PCM provides individual inclusion of each of injectors according to an ignition order. Besides, the module controls duration of opening of injectors, the determined width of the operating impulse. The amount of the fuel injected into the cylinder is defined by duration of opening of an injector. More detailed information on the principle of functioning of system of injection, replacement and service of injectors is provided in the Head of the Power supply system and release.
Module of management of ignition (ICM) – The module operates functioning of coils of ignition, defining demanded a basic advancing on the basis of the teams developed by ECM/PCM. On all models of cars considered in the present manual it is used built in ICM ignition distributor, for more details see the Head Elektrooborudovaniye of the engine.
Valve of stabilization of turns of idling (IAC) – The IAC Valve carries out a dosage of amount of the air bypassed bypassing a butterfly valve when the last is closed or holds idling position. ECM/PCM operates opening of the valve and formation of the resulting air stream. More detailed information on the IAC valve contains in Chapter 4.
The valve of a purge of a coal adsorber – the Electromagnetic valve of a purge of a coal adsorber is a component of system of catching of fuel evaporations (EVAP) and, working at the command of ECM/PCM, carries out blowing of the fuel vapors which accumulated in an adsorber in the inlet pipeline for the purpose of burning them in the course of normal functioning of the engine.
Reading of codes of malfunctions
List of codes of malfunctions of system of self-diagnostics OBD-I
List of codes of malfunctions of system of self-diagnostics OBD-II
Cleaning of memory of ECM/PCM
When entering a code of malfunction in memory of ECM/PCM on an instrument guard of the car the control lamp "Lights up check the engine". The code remains written down in memory of the module until it it is not powered off. For cleaning of memory of the module of management on 10÷15 of seconds take BACK-UP safety lock from the assembly block located in the right part of a motive compartment (see the Head Onboard electric equipment).