Honda Accord

of release

Repair and operation of the car

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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 is of particular importance. 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 factor is not essential at measurement of rather high values of tension (9 ÷ 12 V), however becomes defining 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. 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 the second 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. In principle, reading of the codes of malfunctions which are written down in memory of system of self-diagnostics can be made by means of the wire crossing point established between concrete plugs of the 16-contact diagnostic socket.

General description of the OBD system

Several diagnostic devices making monitoring of separate parameters of systems of decrease in toxicity and fixing the revealed refusals in memory of the onboard processor in the form of individual codes of malfunctions are a part of the OBD 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.

All models described in the present manual are equipped with system of onboard diagnostics of the second generation (OBD-II). A basic element of system is the onboard processor more often called by the electronic module of management (ESM), or the module of management of functioning of the power unit (RSM). RSM 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, RSM 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. 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.

In principle, reading of the codes of malfunctions which are written down in memory of system of self-diagnostics can be made by means of the wire crossing point established between concrete plugs of the 16-contact diagnostic socket.

Special guarantee certificates with the extended validity extend to service of components of control systems of engine/decrease in toxicity of the fulfilled gases. It is not necessary to make attempts of independent performance of failure diagnostics of RSM or replacement of components of system, to an exit of terms of these obligations, - address specialists of company car repair shops of the Honda company.

Information sensors

Oxygen sensors (l-probes) - the Sensor develops a signal which amplitude depends on a difference of content of oxygen (About₂) in the fulfilled gases of the engine and external air.
Sensor of provision of a bent shaft (ICR) - The sensor informs RSM on the provision of a bent shaft and turns of the engine. This information is used by the processor during the determining of the moments of injection of fuel and installation of a corner of an advancing of ignition.
Sensor of position of pistons (CYP) - On the basis of the analysis of the signals of RSM arriving from the sensor calculates position of the piston of the first cylinder and uses this information when determining the moments and the sequence of injection of fuel in engine combustion chambers.
BMT (TDC) sensor - The signals developed by the sensor are used by RSM when determining installations of a corner of an advancing of ignition at engine launch.
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 corrections 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) - RSM 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 the case 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 RSM 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 depression depth variations in the inlet pipeline connected with changes of turns of a bent shaft and load of the engine and will transform the obtained information to an amplitude signal. RSM uses information delivered by the MAR and IAT sensors at thin corrections of supply of fuel.
The barometric sensor of pressure - the Sensor develops the amplitude signal proportional to changes of atmospheric pressure which is used by RSM when determining duration of the moments of injection of fuel. The sensor is built in the RSM module and is not subject to service in an individual order.
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 RSM arriving from the sensor carries out the corresponding correction of a corner of an advancing of ignition.
Sensor of speed of the movement of the car (VSS) - As appears from its name, the sensor informs the processor on the current speed of the movement of the car.
Sensor of size of opening of the EGR valve - The sensor notifies RSM on EGR valve plunger shift size. The obtained information is used then the processor at management of functioning of system of recirculation of the fulfilled gases.
Pressure sensor in the fuel tank - the Sensor is a 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 RSM 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 RSM arriving from the PSP 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 at commission of maneuvers.
Transmission sensors - In addition to the data arriving from VSS, RSM obtains also information from the sensors placed in the transmission, or connected to it. Are among such sensors: (a) RPM meter of a secondary (radical) shaft and (b) RPM meter of an intermediate shaft.
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 RSM which regards it as the evidence of increase of load of the engine and as appropriate corrects turns of its idling.

Actuation mechanisms

Main PGM-FI relay (relay of the fuel pump) - RSM 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. More detailed information on the main relay is provided in the Head of the Power supply system and release.
Fuel injection injectors - RSM provides individual inclusion of each of injectors according to an established order of ignition. Besides, the module controls duration of opening of injectors determined by the width of the operating impulse measured in milliseconds and defining amount of the fuel injected into the cylinder. 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 the coil of ignition, defining the required basic advancing on the basis of the developed RSM of teams. 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. RSM operates opening of the valve and formation of the resulting air stream.
The electromagnetic valve of a purge of a coal adsorber - the Valve is a component of system of catching of fuel evaporations (EVAP) and, working at the command of RSM, makes production 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.
The electromagnet of management of a purge of a coal adsorber - the Electromagnet is used by RSM when checking by the OBD-II system of serviceability of functioning of the EVAP system.

Reading of codes of malfunctions

PERFORMANCE ORDER

1. At detection of the malfunction repeating in a row in spirit trips, RSM issues the command for inclusion of the control lamp which is built in in an instrument guard "Check the engine", called also by the indicator of refusals. The lamp will continue to burn until memory of system of self-diagnostics is not cleared of the codes of the revealed malfunctions brought in it. Reading of codes of malfunctions in the OBD-II system can be made in two various ways. The first way demands short circuit among themselves a wire crossing point of plugs No. No. 8 and 13 of the 16-contact socket of the database (DLC). In the second case reading is made by means of the special scanner which interface allows to make connection it to the 16-contact DLC socket of the OBD-II system. The detailed description of a method of reading of codes by means of a wire crossing point is given below. In case of need implementation of the procedure can be entrusted to specialists of car service.
2. Without starting the engine, include ignition, - a control lamp "Check the engine" has to light up, otherwise it should be replaced. Having checked serviceability of a condition of a lamp, again switch off ignition.

3. Find under the dashboard the 16-contact diagnostic DLC socket at the left and at a wire crossing point replace among themselves its plugs with No. No. 8 and 13.

Be careful, - try not to damage plugs.

4. 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. If memory of system is true, the control lamp will not join.

Cleaning of memory of ECM/PCM

PERFORMANCE ORDER

1. When entering a code of malfunction in memory of RSM 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 switch off ignition and on 10 ÷ 15 seconds take a safety lock No. 13 (BACK-UP) on 7.5 A of the assembly block located in the right part of a motive compartment (see the Head Onboard electric equipment). In case of need implementation of the procedure of cleaning of memory of the OBD system can be entrusted to specialists of car service.

You do not make cleaning of memory of OBD by a detachment of a negative wire from the battery as it will lead to deleting of adjusting parameters of the engine and violation of stability of its turns during the first time after primary start.

2. Track that memory of system was cleared before installation on the engine of new components of systems of decrease in toxicity of the fulfilled gases. If before start of system after replacement of the failed information sensor not to make cleaning of memory of refusals, RSM will bring in it a new code of malfunction. Cleaning of memory allows the processor to make change-over on new parameters. At the same time the first 50 ÷ 20 minutes after primary start of the engine some violation of stability of its turns can take place.

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

Number of a code (number of flashes of a control lamp)	Possible cause of failure
P0107 (3)	Low entrance signal of the MAR sensor
P0108 (3)	High entrance signal of the MAR sensor
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 (oxygen sensor 1)
P0133 (61)	Slow reaction of primary warmed-up l-probe (the oxygen sensor 1)
P0135 (41)	Malfunction in a chain 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 (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 (71)	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
P0305 (75)	Admissions of ignition in the cylinder No. 5 (V6 models)
P0306 (76)	Admissions of ignition in the cylinder No. 6 (V6 models)
P0325 (23)	Malfunction in a detonation sensor chain (4-cylinder models)
P0335 (4)	Malfunction in a chain of the sensor of ICR
P0336 (4)	Sensor of ICR
P0401 (80)	Too small stream of EGR is revealed
P0420 (67)	Insufficient efficiency of functioning of the catalytic converter
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 (4-cylinder models with RKPP)
P0505 (14)	Malfunction in an IAC sensor chain
P0715 (70)	Malfunction of AT
P0720 (70)	Malfunction of AT
P0725 (70)	Malfunction of AT
P0730 (70)	Malfunction of AT
P0740 (70)	Malfunction of AT
P0753 (70)	Malfunction of AT
P0758 (70)	Malfunction of AT
P0763 (70)	Malfunction of AT
P1106 (13)	Barometric sensor
P1107 (13)	Low entrance signal of the barometric sensor
P1108 (13)	High entrance signal of the barometric sensor
P1121 (7)	Low entrance signal of the TPS sensor
P1122 (7)	High entrance signal of the TPS sensor
P1128 (5)	Absolute pressure in the pipeline is lower expected (a low entrance signal of the MAR sensor)
P1129 (5)	Absolute pressure in the pipeline is higher expected (a high entrance signal of the MAR sensor)
P1149 (61)	Malfunction of primary l-probe (4-cylinder models)
P1162 (48)	Malfunction in a chain of primary l-probe (4-cylinder models)
P1163 (61)	Too slow reaction of primary l-probe (4-cylinder models)
P1164 (61)	Malfunction of primary l-probe (4-cylinder models)
P1165 (61)	Malfunction of primary l-probe (4-cylinder models)
P1166 (41)	Malfunction of primary l-probe (4-cylinder models)
P1167 (41)	Malfunction in a chain of the heater of primary l-probe (4-cylinder models)
P1253 (21)	Malfunction of functioning of the VTEC system (4-cylinder models)
P1257 (22)	Malfunction of functioning of the VTEC system (4-cylinder models)
P1258 (22)	Malfunction of functioning of the VTEC system (4-cylinder models)
P1259 (22)	Malfunction of functioning of the VTEC system
P1297 (20)	Low entrance signal of ELD
P1298 (20)	High entrance signal of ELD
P1359 (8)	The sensor of ICR/TDC is disconnected
P1361 (8)	Instability of indications of the TDC sensor
P1362 (8)	There is no signal from the TDC sensor
P1366 (58)	Instability of indications of the TDC-2 sensor (V6 model)
P1367 (58)	There is no signal from the TDC sensor (V6 model)
P1381 (9)	Instability of indications of the CYP sensor (4-cylinder models)
P1381 (9)	There is no signal from the CYP sensor (4-cylinder models)
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
P1519 (14)	Malfunction in an IAC valve chain
P1607 (-)	Malfunction of an internal chain of RSM
P1705 (-)	Malfunction of AT
P1706 (-)	Malfunction of AT
P1738 (-)	Malfunction of AT
P1739 (-)	Malfunction of AT
P1753 (-)	Malfunction of AT
P1768 (-)	Malfunction of AT
P1773 (-)	Malfunction of AT
P1791 (-)	Malfunction of AT