Honda Accord

1998-1999 of release

Repair and car operation

System of onboard diagnostics (OBD) - a principle of functioning and codes of malfunctions

Data on diagnostic devices

Check of serviceability of functioning of components of systems of injection and decrease in toxicity of the fulfilled gases is made by means of a universal digital measuring instrument (multimeter). Use of a digital measuring instrument preferably 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 in the structure electronic components, such accuracy takes on special significance. The second, the reason that fact is not less important that the internal contour of a digital multimeter, has rather high impedance (internal resistance of the device makes 10 million Ohm). As the voltmeter is connected to a checked chain in parallel, accuracy of measurement by that is higher, than the smaller parasitic current will pass through actually device. This factor is not essential at measurement of rather high values of tension (9 ÷ 12 In), however there is defining at diagnostics of elements giving out low-voltage signals, such, as, for example, an oxygen sensor where it is a question of measurement of shares of volt.

The most convenient device for diagnostics of control systems by the engine of modern models of cars are manual input readers of skanerny type. Scanners of the first generation serve for reading of codes of malfunctions of OBD-I systems. Before application the input reader should be checked on compliance of model and year of release of the checked car. Some scanners are multipurpose, at the expense of possibility of change of a cartridge depending on model of the diagnosed car (Ford, GM, Chrysler, etc.), others are adhered to requirements of the regional authorities and intended for use in certain regions of the world (Europe, Asia, the USA etc.).

With introduction in production meeting the requirements of the last legislations on environmental protection of system of onboard diagnostics of the second generation (OBD-II) input readers of a special design started to be issued. Some producers adjusted release of the scanners intended for use by amateur mechanics in house conditions, - ask in shops of automobile accessories. In principle, reading written down in memory of system of self-diagnostics of codes of malfunctions can be made by means of a wire crossing point established between concrete plugs of the 16-contact diagnostic socket.

General description of OBD system

The structure of OBD system includes some diagnostic devices making monitoring of separate parameters of systems of decrease in toxicity and fixing revealed refusals in memory of the onboard processor in the form of individual codes of malfunctions. The system makes also check of sensors and actuation mechanisms, supervises operational cycles of a vehicle, provides possibility of freezing of parameters and cleaning of the block of memory.

All models described in the real Management 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 data arriving from information sensors and according to put in memory of the processor in base parameters, 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 memory of the OBD-II processor is made by means of the special scanner connected to the 16-contact diagnostic socket of reading of a database (DLC), located under the dashboard from the driver's party of the car.

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

On service of components of control systems of engine/decrease in toxicity of the fulfilled gases special guarantee certificates with the prolonged validity period extend. It is not necessary to undertake attempts of independent performance of problem diagnostics of RSM or replacement of components of system, to an exit of terms of these obligations, - address to specialists of firm 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 the content of oxygen (About₂) in the fulfilled gases of the engine and external air.
The sensor of provision of a cranked shaft (SKR) - the Sensor informs RSM on the provision of a cranked shaft and engine turns. This information is used by the processor at definition of the moments of injection of fuel and installation of a corner of an advancing of ignition.
The sensor of position of pistons (CYP) - on the basis of the analysis of signals of RSM arriving from the sensor calculates position of the piston of the first cylinder and uses this information at definition of the moments and sequence of injection of fuel in chambers of combustion of the engine.
(TDC) VMT sensor - signals Developed by the sensor are used by RSM at definition of installations of a corner of an advancing of ignition at the moment of engine start.
The sensor of temperature of cooling liquid of the engine (eats) - on the basis of information ESM/RSM arriving from the sensor carries out necessary corrections of structure of an air and fuel mix and a corner of an advancing of ignition, and also supervises EGR system work.
The sensor of temperature of 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 EGR system functioning.
The sensor of provision of a butterfly valve (TPS) - the Sensor is located on the case of a throttle and connected to a butterfly valve axis. By amplitude of given-out TPS of a signal of RSM determines a corner of opening of a butterfly valve (copes the driver from a gas pedal) and as appropriate corrects supply of fuel to inlet ports of chambers of combustion. 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 supervises variations of depth of depression in the inlet pipeline, connected with changes of turns of a cranked shaft and load of the engine and will transform received information to a peak signal. RSM uses information delivered by MAR and IAT sensors at thin corrections of supply of fuel.
The barometric sensor of pressure - the Sensor develops the peak signal proportional to changes of atmospheric pressure which is used by RSM at determination of duration of the moments of injection of fuel. The sensor is built in the RSM module and to service in an individual order is not subject.
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.
The sensor of speed of movement of the car (VSS) - As appears from its name, the sensor informs the processor on the current speed of movement of the car.
The sensor of size of opening of the EGR valve - the Sensor notifies RSM on size of shift of a plunzher of the EGR valve. Received information is used then the processor at management of functioning of system of a retsirkulyatsiya of the fulfilled gases.
The pressure sensor in a fuel tank - the Sensor is a component of system of catching of fuel evaporations (EVAP) and serves for pressure tracking паров gasoline in a tank. On the basis of information of RSM arriving from the sensor gives out commands for operation of electromagnetic valves of a purge of system.
The 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 of turns of idling at the expense of IAC sensor operation for the purpose of compensation of 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 receives also information from sensors placed in a transmission, or connected to it. Number of such sensors treat: (а) sensor of turns of a secondary (radical) shaft and (b) sensor of turns of an intermediate shaft.
The sensor switch of management of turning on of the coupling of coupling of the conditioner of air - When giving food from the battery to the electromagnetic valve of the To/to compressor the corresponding information signal arrives on RSM which regards it as the certificate of increase of load of the engine and as appropriate corrects turns of its idling.

Actuation mechanisms

The main PGM-FI relay (the relay of the fuel pump) - RSM makes activation of the relay of the fuel pump at an ignition key povorachivaniye in the situation START or RUN. At ignition inclusion activation of the relay provides pressure lifting in a power supply system. More detailed information on the main relay is provided in Head of the Power supply system and release.
Injectors of injection of fuel - RSM provides individual inclusion of each of injectors according to an ignition established order. Besides, the module supervises duration of opening of the injectors, defined in the width of an operating impulse measured in milliseconds and defining amount of fuel injected into the cylinder. More detailed information on a principle of functioning of system of injection, replacement and service of injectors is provided in Head of the Power supply system and release.
The module of management of ignition (ICM) - the Module operates functioning of the coil of ignition, defining a demanded base advancing on the basis of developed RSM of teams. On all models of cars considered in the real Management it is used built in the distributor of ignition of ICM, for more details see. Head engine Electric equipment.
The valve of stabilization of turns of idling (IAC) - the IAC Valve carries out a dosage of amount of the air which is restarted up bypassing a butterfly valve when the last is closed, or occupies the provision of idling. Opening of the valve and formation of a rezultiruyushchy air stream RSM operates.
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, carries out release accumulated in an adsorber паров fuels 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 at check by OBD-II system of serviceability of functioning of EVAP system.

Reading of codes of malfunctions

PERFORMANCE ORDER

1. At detection of the malfunction repeating in a row in spirit trips, RSM gives out command for inclusion of the control lamp built in in an instrument guard “Check the engine”, called also the indicator of refusals. The lamp will continue to burn until memory of system of self-diagnostics will not be cleared of the codes of the revealed malfunctions brought in it. Reading of codes of malfunctions in OBD-II system can be made in two various ways. The first way demands short circuit among themselves a wire crossing point of No. No. 8 and 13 plugs of the 16-contact socket of a 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 OBD-II system. The detailed description of a method of reading of codes by means of a wire crossing point below is provided. In case of need performance of procedure can be entrusted to specialists of car-care center.
2. Without starting the engine, include ignition, - a control lamp “Check the engine” should light up, otherwise it is necessary to replace it. Having checked serviceability of a condition of a lamp, again switch off ignition.

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

Be careful, - try not to damage plugs.

4. Include ignition, having turned a key in the situation ON. If in memory of the processor codes of taking place malfunctions are brought, they will start to be highlighted consistently by a control lamp “Check the engine” on an instrument guard of the car. The first figure of a two-place code is highlighted by long blinkings of the 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 it is written down more than one code, they will be serially highlighted, then, after a pause the highlighting of codes will repeat. If memory of system is pure, the control lamp will not join.

Cleaning of memory ESM/RSM

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 a food will not be disconnected from it. 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 And from the assembly block located in the right part of an impellent compartment (see. Head Onboard electric equipment). In case of need performance of procedure of cleaning of memory of OBD system can be entrusted to specialists of car-care center.

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 system start 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. Thus 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 of OBD-II

Code number (number of flashes of a control lamp)	Possible cause of failure
Р0107 (3)	Low entrance signal of the MAR sensor
Р0108 (3)	High entrance signal of the MAR sensor
Р0112 (10)	Low entrance signal of the IAT sensor
Р0113 (10)	High entrance signal of the IAT sensor
Р0116 (86)	Eats sensors/problems with efficiency of return of the engine
Р0117 (6)	Low entrance signal of the eats sensor
Р0118 (6)	High entrance signal of the eats sensor
Р0122 (7)	Low entrance signal of the TPS sensor
Р0123 (7)	High entrance signal of the TPS sensor
Р0131 (1)	Low voltage of a chain of primary warmed-up l-probe (the oxygen sensor 1)
Р0132 (1)	High voltage of a chain of primary warmed-up l-probe (oxygen sensor 1)
Р0133 (61)	Slow reaction of primary warmed-up l-probe (the oxygen sensor 1)
Р0135 (41)	Malfunction in a chain of primary l-probe (the oxygen sensor 1)
Р0137 (63)	Low voltage of a chain of a secondary warmed-up l-probe (the oxygen sensor 2)
Р0138 (63)	High voltage of a chain of a secondary warmed-up l-probe (oxygen sensor 2)
Р0139 (63)	Slow reaction of a secondary warmed-up l-probe (the oxygen sensor 2)
Р0141 (65)	Malfunction in a chain of a heater of a secondary l-probe (the oxygen sensor 2)
Р0171 (45)	Mix repauperization
Р0172 (45)	Mix reenrichment
Р0300 (71)	Casual admissions of ignition
Р0301 (71)	Ignition admissions in the cylinder No. 1
Р0302 (72)	Ignition admissions in the cylinder No. 2
Р0303 (73)	Ignition admissions in the cylinder No. 3
Р0304 (74)	Ignition admissions in the cylinder No. 4
Р0305 (75)	Ignition admissions in the cylinder No. 5 (V6 models)
Р0306 (76)	Ignition admissions in the cylinder No. 6 (V6 models)
Р0325 (23)	Malfunction in a chain of the sensor of a detonation (4-cylinder models)
Р0335 (4)	Malfunction in a SKR sensor chain
Р0336 (4)	SKR sensor
Р0401 (80)	Too small stream of EGR is revealed
Р0420 (67)	Insufficient efficiency of functioning of the catalytic converter
Р0452 (91)	Low entrance signal of the sensor of pressure in a fuel tank (EVAP system)
Р0453 (91)	High entrance signal of the sensor of pressure in a fuel tank (EVAP system)
Р0500 (17)	Malfunction in VSS chain (4-cylinder models with RKPP)
Р0505 (14)	Malfunction in an IAC sensor chain
Р0715 (70)	Malfunction of AT
Р0720 (70)	Malfunction of AT
Р0725 (70)	Malfunction of AT
Р0730 (70)	Malfunction of AT
Р0740 (70)	Malfunction of AT
Р0753 (70)	Malfunction of AT
Р0758 (70)	Malfunction of AT
Р0763 (70)	Malfunction of AT
Р1106 (13)	Barometric sensor
Р1107 (13)	Low entrance signal of the barometric sensor
Р1108 (13)	High entrance signal of the barometric sensor
Р1121 (7)	Low entrance signal of the TPS sensor
Р1122 (7)	High entrance signal of the TPS sensor
Р1128 (5)	Absolute pressure in the pipeline is lower expected (a low entrance signal of the MAR sensor)
Р1129 (5)	Absolute pressure in the pipeline is higher expected (a high entrance signal of the MAR sensor)
Р1149 (61)	Malfunction of primary l-probe (4-cylinder models)
Р1162 (48)	Malfunction in a chain of primary l-probe (4-cylinder models)
Р1163 (61)	Too slow reaction of primary l-probe (4-cylinder models)
Р1164 (61)	Malfunction of primary l-probe (4-cylinder models)
Р1165 (61)	Malfunction of primary l-probe (4-cylinder models)
Р1166 (41)	Malfunction of primary l-probe (4-cylinder models)
Р1167 (41)	Malfunction in a chain of a heater of primary l-probe (4-cylinder models)
Р1253 (21)	Malfunction of functioning of VTEC system (4-cylinder models)
Р1257 (22)	Malfunction of functioning of VTEC system (4-cylinder models)
Р1258 (22)	Malfunction of functioning of VTEC system (4-cylinder models)
Р1259 (22)	Malfunction of functioning of VTEC system
Р1297 (20)	Low entrance signal of ELD
Р1298 (20)	High entrance signal of ELD
Р1359 (8)	The CKP/TDC sensor is disconnected
Р1361 (8)	Instability of indications of the TDC sensor
Р1362 (8)	There is no signal from the TDC sensor
Р1366 (58)	Instability of indications of the TDC-2 sensor (V6 model)
Р1367 (58)	There is no signal from the TDC sensor (V6 model)
Р1381 (9)	Instability of indications of the CYP sensor (4-cylinder models)
Р1381 (9)	There is no signal from the CYP sensor (4-cylinder models)
Р1456 (90)	Leakages of fuel evaporations in a fuel tank (EVAP) take place
Р1457 (90)	Leakages of fuel evaporations in a coal adsorber (EVAP) take place
Р1491 (12)	Extent of opening of the EGR valve is insufficient
Р1498 (12)	The sensor of opening of the EGR valve gives out too high signal
Р1519 (14)	Malfunction in an IAC valve chain
Р1607 (-)	Malfunction of an internal chain of RSM
Р1705 (-)	Malfunction of AT
Р1706 (-)	Malfunction of AT
Р1738 (-)	Malfunction of AT
Р1739 (-)	Malfunction of AT
Р1753 (-)	Malfunction of AT
Р1768 (-)	Malfunction of AT
Р1773 (-)	Malfunction of AT
Р1791 (-)	Malfunction of AT