Honda Civic/Acura Integra

since 1994 release

Repair and operation of the car

Control systems of the engine

General information

For the purpose of decrease in level of issue in the atmosphere of the toxic components getting into composition of the fulfilled engine gases as a result of incompleteness of combustion of fuel and also for maintenance of efficiency of return engines and the decrease in fuel consumption considered in the present manual cars are equipped a number of special systems which could be united under the general name of control systems of the engine and decrease in toxicity of the fulfilled gases (see illustrations below).

The scheme of an arrangement of components of control systems of engine/decrease in toxicity of the fulfilled gases in a motive compartment of the car (Civic)

1 — ECM/PCM with the control socket (under the dashboard)
2 — the Detector of monitoring electric loadings (ELD) (under the assembly block of safety locks)
3 — the Sensor of provision of a butterfly valve (TPS)
4 — the Sensor of absolute pressure in the pipeline (MAR)
5 — the Sensor of temperature of the soaked-up air (IAT)

6 — the Diagnostic socket (under the dashboard)
7 — pressure Sensor switch in system of hydrostrengthening of a wheel (in the pressure head line)
8 — the Sensor of fluctuations of a bent shaft (CKF)
9 — Oxygen sensors (l-probes) (in a collector and the catalytic converter)
10 — the Sensor of temperature of cooling liquid of the engine (EST)

The scheme of an arrangement of components of control systems of engine/decrease in toxicity of the fulfilled gases in a motive compartment of the car (Integra)


1 — ECM/PCM with the control socket (under the dashboard) 2 — the Detector of monitoring electric loadings (ELD) (under the assembly block of safety locks) 3 — the Sensor of provision of a butterfly valve (TPS) 4 — the Sensor of absolute pressure in the pipeline (MAR) 5 — the Sensor of temperature of the soaked-up air (IAT) 6 — the Valve of stabilization of turns of idling (IAC)	7 — pressure Sensor switch in system of hydrostrengthening of a wheel (in the pressure head line) 8 — the Sensor of fluctuations of a bent shaft (CKF) 9 — the detonation Sensor 10 — Oxygen sensors (l-probes) (in a collector and the catalytic converter) 11 — the Sensor of temperature of cooling liquid of the engine (EST) 12 — the Diagnostic socket (under the dashboard)

It is necessary to carry the following to number of the systems concerning management of operation of the engine and control of toxicity of the fulfilled gases:

   a) System of self-diagnostics;
   b) System of electronic control by the engine (PGM-FI);
   c) Detector of control of electric loadings (ELD);
   d) System of catching of fuel evaporations (EVAP);
   e) Catalytic converter.
   f) System of the operated ventilation of a case (PCV);

Functioning of all listed systems, anyway, directly or indirectly, is connected with management of decrease in toxicity of the fulfilled gases.

In the Sections given below the general descriptions of the principles of functioning of each of systems are given, and also procedures of diagnostic checks and recovery repair (if that is obviously possible) components of systems which performance lies within qualification of the average amateur mechanic are stated

Before coming to conclusion about refusal of toxicity, any of systems of decrease, attentively check serviceability of functioning of power supply systems and ignition (see Chapters of the Power supply system and release and engine Electric equipment). Diagnostics of some of knots of systems of decrease in toxicity demands use special, difficult in application, the equipment and a certain qualification of personnel, and therefore, its performance will be reasonable to charge to professional mechanics service center of the company manufacturer of the car.

Told above does not mean that service and repair of components of systems of decrease in toxicity in practice are represented exigeant. Do not forget that one of the most common causes of refusals is elementary violation of quality of vacuum or electric communications, and therefore, first of all it is always necessary to check a condition of nipple and electric sockets. The owner of the car can independently and it is rather simple to make a number of checks, and also, in house conditions to perform a set of procedures of routine maintenance of the majority of components of systems, using at the same time a usual set of the adjusting and metalwork tool.

Do not forget about additional federal guarantee certificates under which components of systems of decrease in toxicity and management of operation of the engine get. Before starting implementation of any procedures on repair of knots and details of these systems, consult about conditions of observance of these obligations in representative office of the Honda company.

Try to observe everything the measures of precautions stipulated in the following Sections when performing service of electronic components of the considered systems. It is necessary to notice that illustrative material can not always correspond in accuracy to real placement of components on the car. Such discrepancies are connected with continuously happening process of modification within a standard design of each model.

Information label of systems of decrease in toxicity of the fulfilled gases (VECI) is fixed in a motive compartment of the car. On a label necessary information on settings and checks of under control systems taking into account all modifications made on the concrete car, and also the scheme of laying of vacuum hoses with identification of various components contains (see an illustration). Before starting service of systems of decrease in toxicity and management of operation of the engine, attentively study data of VECI.