Honda Civic/Acura Integra

since 1994 release

Repair and operation of the car

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.

Information sensors

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.

Actuation mechanisms

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

PERFORMANCE ORDER

1. The control service socket is located under the dashboard from the passenger party of the car (see an accompanying illustration). 2. For reading of codes of malfunctions it is necessary to close socket plugs a wire crossing point and to monitor indications of the control lamp which is built in in an instrument guard of the car "Check the engine" (fairly for all models). The special diagnostic reader can be connected only to the 16-contact diagnostic socket of the database (DLC) located at the left under the car dashboard (see an accompanying illustration). 3. For viewing of the codes of malfunctions which are written down in memory of ECM/PCM install a crossing point in the control service socket (see an illustration to paragraph 1), then include ignition, having turned a key in position of ON. If in the processor memory codes of the malfunctions taking place are brought, they will begin to be highlighted consistently by a control lamp "Check the engine" on an instrument guard of the car. The first figure of a two-digit code is highlighted by long blinkings of a lamp, the second – short (for example, one long inclusion accompanied six short corresponds to a code 16). If in memory of the module of management more than one code are written down, they will be serially highlighted, then, after a pause highlighting of codes will repeat.

List of codes of malfunctions of system of self-diagnostics OBD-I

Number of a code	Chain or system	Actions for elimination of a cause of failure
1	ECM/PCM is faulty	Check the ECM/PCM electric socket if it is not possible to reveal signs of violation of contacts, drive away the car for detailed diagnostics on car repair shop
3 and 5	Content of oxygen	Check the oxygen sensor, its heater and a chain of an electrical wiring (see Check of serviceability of a state and replacement of the sensor of provision of a butterfly valve (TPS))
4	MAR	Check the MAR sensor and its electric chain (see Check of serviceability of a state and replacement of the sensor of provision of a butterfly valve (TPS))
6	ICR	Check the sensor of ICR and its electric chain (see Check of serviceability of a state and replacement of the sensor of provision of a butterfly valve (TPS))
7	TPS	Check the TPS sensor and its electric chain (see Check of serviceability of a state and replacement of the sensor of provision of a butterfly valve (TPS))
8	BMT (TDC)	Check the TDC sensor and its electric chain (see Check of serviceability of a state and replacement of the sensor of provision of a butterfly valve (TPS))
9	CYP cylinder No. 1	Check the CYP sensor and its electric chain (see Check of serviceability of a state and replacement of the sensor of provision of a butterfly valve (TPS))
10	IAT	Check the IAT sensor and its electric chain (see Check of serviceability of a state and replacement of the sensor of provision of a butterfly valve (TPS))
12	EGR	Check a condition of hoses of system, the sensor of size of opening of the EGR valve and the EGR valve (see Check of serviceability of a state and replacement of the sensor of temperature of the soaked-up air (IAT))
13	Barometric pressure	Drive away the car for check on car repair shop
14	IAC valve	Check the IAC valve and system of stabilization of turns of idling (see the Head of the Power supply system and release)
15	Output signal of ignition	Check system of ignition (see the Head Elektrooborudovaniye of the engine)
16	Injection injector	Check a power supply system and injectors of injection of fuel (see the Head of the Power supply system and release)
17	VSS	Drive away the car for check on car repair shop
19	Locking Ý/m valve	On models with AT check a state Ý/m the valve (see 4-staged and stepless automatic transmissions (ат and cvt))
20	ELD	Check the ELD system (see 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))
21	Adjustment of phases GRM and Ý/m raising of the valve	See checks Ý/m VTEC valves, the Head Remont of the engine without extraction from the car - the Civic model
22	Adjustment of phases GRM and sensor of pressure	See checks of the sensor of pressure of VTEC, the Head Remont of the engine without extraction from the car - the Civic model
30	Signal And And/T FI (models with AT)	Drive away the car for check on car repair shop
41	Heater of the oxygen sensor	Check serviceability of a signal of tension of the heater (see the Head of the Power supply system and release)
43	Fuel supply system	Check the fuel pressure, and a condition of the regulator (see the Head of the Power supply system and release), also check oxygen sensors for existence of signs of losses of depression
48	The warmed-up l-probe	Check serviceability of a signal of tension of the heater (see the Head of the Power supply system and release)

List of codes of malfunctions of system of self-diagnostics OBD-II

Number of a code (number of flashes of MIL)	Possible cause of failure
P0106 (5)	Sensor of the MAR/PROBLEM with efficiency of return of the engine
P0107 (3)	Low entrance signal of the MAR sensor
P0108 (3)	High entrance signal of the MAR sensor
P0111 (10)	The IAT/problem sensor with efficiency of return of the engine
P0112 (10)	Low entrance signal of the IAT sensor
P0113 (10)	High entrance signal of the IAT sensor
P0116 (86)	Eats sensors/problems with efficiency of return of the engine
P0117 (6)	Low entrance signal of the eats sensor
P0118 (6)	High entrance signal of the eats sensor
P0122 (7)	Low entrance signal of the TPS sensor
P0123 (7)	High entrance signal of the TPS sensor
P0131 (1)	The low voltage of a chain of primary warmed-up l-probe (the oxygen sensor 1)
P0132 (1)	High voltage of a chain of primary warmed-up l-probe (the oxygen sensor 1)
P0133 (61)	Slow reaction of primary warmed-up l-probe (the oxygen sensor 1)
P0135 (41)	Malfunction in a chain of the heater of primary l-probe (the oxygen sensor 1)
P0137 (63)	The low voltage of a chain of the secondary warmed-up l-probe (the oxygen sensor 2)
P0138 (63)	High voltage of a chain of the secondary warmed-up l-probe (the oxygen sensor 2)
P0139 (63)	Slow reaction of the secondary warmed-up l-probe (the oxygen sensor 2)
P0141 (65)	Malfunction in a chain of the heater of the secondary l-probe (the oxygen sensor 2)
P0171 (45)	Mix reimpoverishment
P0172 (45)	Mix reenrichment
P0300	Casual admissions of ignition
P0301 (71)	Admissions of ignition in the cylinder No. 1
P0302 (72)	Admissions of ignition in the cylinder No. 2
P0303 (73)	Admissions of ignition in the cylinder No. 3
P0304 (74)	Admissions of ignition in the cylinder No. 4
P0325 (23)	Malfunction in a detonation sensor chain
P0335 (4)	Malfunction in a chain of the sensor of ICR
P0336 (4)	Sensor of an ICR/problem with efficiency of return of the engine
P0401 (80)	Too small stream of EGR is revealed
P0420 (67)	Insufficient efficiency of functioning of the catalytic converter
P0441 (92)	EVAP purge is insufficiently effectively carried out
P0452 (91)	Low entrance signal of the sensor of pressure in the fuel tank (EVAP system)
P0453 (91)	High entrance signal of the sensor of pressure in the fuel tank (EVAP system)
P0500 (17)	Malfunction in VSS chain
P0501 (17)	The VSS/problem sensor with efficiency of return of the engine
P0505 (14)	Malfunction in an IAC sensor chain
P0700 (70)	AT
P0715 (70)	AT
P0720 (70)	AT
P0725 (70)	AT
P0730 (70)	AT
P0740 (70)	AT
P0753 (70)	AT
P0758 (70)	AT
P1106 (13)	The BARO/problem sensor with efficiency of return of the engine
P1107 (13)	Low entrance signal of the BARO sensor
P1108 (13)	High entrance signal of the BARO sensor
P1121 (7)	Extent of opening of a butterfly valve is more than expected
P1122 (7)	Extent of opening of a butterfly valve is more than expected
P1128 (5)	Absolute pressure in the pipeline is lower than expected
P1129 (5)	Absolute pressure in the pipeline is higher than expected
P1162 (48)	Malfunction in a chain of primary l-probe (the oxygen sensor 1)
P1163 (61)	Too slow reaction of primary l-probe (oxygen sensor 1)
P1164 (61)	Primary l-zond/problemy with efficiency of return of the engine
P1165 (61)	Primary l-zond/problemy with efficiency of return of the engine
P1166 (41)	Malfunction in a chain of primary l-probe (the oxygen sensor 1)
P1167 (41)	Malfunction in a chain of the heater of primary l-probe (the oxygen sensor 1)
P1168 (48)	Low entrance signal of LABEL of primary l-probe (oxygen sensor 1)
P1169 (48)	High entrance signal of LABEL of primary l-probe (oxygen sensor 1)
P1259 (22)	Malfunction of the VTEC system
P1297 (20)	Low entrance signal of ELD
P1298 (20)	High entrance signal of ELD
P1300 (-)	Casual refusal
P1301 (71)	Admissions of ignition in the cylinder No. 1
P1302 (72)	Admissions of ignition in the cylinder No. 2
P1303 (73)	Admissions of ignition in the cylinder No. 3
P1304 (74)	Admissions of ignition in the cylinder No. 4
P1336 (54)	Instability of indications of the CKF sensor
P1337 (54)	There is no signal from the CKF sensor
P1359 (8)	The sensor of ICR/TDC is disconnected
P1361 (8)	Instability of indications of the sensor of ICR/TDC
P1362 (8)	There is no signal from the TDC sensor
P1381 (9)	Instability of indications of the CYP sensor
P1381 (9)	There is no signal from the CYP sensor
P1456 (90)	Leakages of fuel evaporations in a gasoline tank (EVAP) take place
P1457 (90)	Leakages of fuel evaporations in a coal adsorber (EVAP) take place
P1491 (12)	Extent of opening of the EGR valve is insufficient
P1498 (12)	The sensor of opening of the EGR valve gives too high signal
P1508 (14)	Malfunction in a chain of the IAC (1) valve
P1509 (14)	Malfunction in a chain of the IAC (2) valve
P1607 (-)	Malfunction of an internal chain of ECM/PCM
P1655 (30)	The break or short circuit of the TMA/TMB alarm line takes place
P1705 (70)	Malfunction of AT
P1706 (70)	Malfunction of AT
P1753 (70)	Malfunction of AT
P1758 (70)	Malfunction of AT
P1768 (70)	Malfunction of AT
P1785 (70)	Malfunction of AT
P1790 (70)	Malfunction of AT
P1791 (70)	Malfunction of AT
P1793 (70)	Malfunction of AT
P1870 (70)	Malfunction of AT
P1873 (70)	Malfunction of AT
P1879 (70)	Malfunction of AT
P1885 (70)	Malfunction of AT
P1886 (70)	Malfunction of AT
P1888 (70)	Malfunction of AT
P1890 (70)	Malfunction of AT
P1891 (70)	Malfunction of AT

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).