Honda Civic/Acura Integra

since 1994 of release

Repair and car operation

VTEC systems – the general information and check of a condition of components

General information

Many of models of Honda cars are equipped with electronic system of correction of phases of a gazoraspredeleniye (VTEC).

Distinction between ordinary engines and the engines equipped with VTEC system, consists in a complete set and a principle of operation of the klapanny mechanism. A design of the block of the engine and all hinged knots and units, and also schemes of the organization of systems of greasing and cooling on both units are identical. Engine outwardly equipped with VTEC system differs existence from above on a cover of a head of cylinders of a convex inscription of the corresponding contents (VTEC).

The inlet camshaft is equipped with three cams for each of valves given by it. The special module of management in capacity (RSM), proceeding from the data arriving from information sensors defines what of sets of cams during each present situation should give inlet valves of chambers of combustion. On the basis of the analysis of arriving information of RSM includes or switches off VTEC system.

As the initial parameters defining functioning of VTEC the following is used:

   a) Frequency of rotation of the engine (rpm);
   b) Speed of movement of the car (mile/h);
   c) Target signal of the sensor of provision of a butterfly valve (TPS);
   d) The current load of the engine, determined by indications of the sensor of absolute pressure in the inlet pipeline (MAR);
   e) Temperature of cooling liquid.

At small turns of the engine both primary, and secondary inlet valves work from own cams and open on identical height and with identical duration, providing a good torque in the bottom range of turns and high speed of reaction to gas.

When there is a need for increase of return of the engine, yokes of primary and secondary inlet valves by means of the special hydraulic device with electronic control are blocked with an intermediate yoke. Thus duration and height of opening of both valves is defined by a form of the intermediate cam, differing bigger height and a smaller ostrokonechnost of lifting.

Primary and secondary yokes cease to contact to own cams until the system will not be disconnected. The system allows to achieve an optimum torque both at small, and at high turns of the engine, depending on the current loading enclosed to it.

Check of a condition of components

Electromagnetic valve of blocking / датчик-выключатель pressure

The electromagnetic valve of blocking of the VTEC system, the including sensor switch of pressure is located in the left part of a back wall of the engine (from a partition of an impellent compartment).

Models 1994 and 1995 of вып.

Malfunctions in a contour of the electromagnetic valve of blocking of VTEC lead to registration of a code of malfunction (DTC) 21 in memory of the control unit. On the car dashboard the control lamp “Thus lights up check the engine”. Detailed information on DTC systems of self-diagnostics it is provided in Head of the Control system by the engine.

Failure of the sensor switch of pressure leads to the record DTC 22 and operation of a control lamp “Check the engine”.

Models since 1996 вып.

Refusal in contours of the electromagnetic valve or the sensor switch of pressure leads to operation of a control lamp “Check the engine” and records in memory of the DTC P1259 control unit. Reading of diagnostic codes needs the OBD II scanner (see. Head of the Control system of the engine).

All models

PERFORMANCE ORDER

1. Disunite the round electric socket on two pressure (see an accompanying illustration). 2. Connect an ohmmeter between sensor switch plugs. The device should fix conductivity existence (zero resistance), otherwise the sensor switch is subject to replacement. 3. Connect the voltmeter between mass of a body and the plug of a dark blue-black wire in the socket е from a plait. At the included ignition (in the situation ON) the device should show a key 12 In, otherwise check a condition of a dark blue-black wire and reliability of its contact connections on a site between the socket and the plug on RSM. 4. If check of tension yields positive result, connect the voltmeter between two plugs of the socket from a plait (dark blue-black and black wires). At the included ignition the device should fix 12 In, otherwise check a condition of a black wire (grounding) and reliability of its contact connections on a site between the socket and weight. 5. At the switched-off ignition (a key in the situation OFF) disunite the 1-contact socket of the electromagnetic valve of blocking of VTEC (see an illustration above). Connect an ohmmeter between the valve plug (not the socket) and mass of a body. If instrument reading falls outside the limits a range from 14 to 30 Ohm, replace the electromagnetic valve (see below). 6. Turn out a bolt on 10 mm from the control union of pressure of oil on the electromagnetic valve. Connect to the union a mechanical manometer for measurement of pressure of oil (see an accompanying illustration). 7. Warm up the engine to normal working temperature (should work the fan of system of cooling). 8. Short breakthroughs serially lift engine turns to values 1000, 3000 and 5000 in a minute. Consider the manometer indication at each of the listed frequencies of rotation of the engine. It is not necessary to lift engine turns without loading more than for one minute. 9. Pressure of oil should be not higher than 0.49 kgfs/cm 2, otherwise it is necessary to check a condition of the electromagnetic VTEC valve. 10. Connect a wire crossing point between the positive plug of the battery the plug of the electromagnetic VTEC valve (see an illustration to paragraph 1). For short time lift engine turns to value 5000 in a minute (no more than for one minute) and consider the manometer indication. This time it owes not less than 4.2 kgfs/cm 2, otherwise check a valve condition. 11a. Remove assembly of the electromagnetic valve, separate from it the pressure sensor switch. 11b. Manually check freedom of a course of a plunzher (see accompanying illustrations). At assembly installation into place do not forget to replace a sealing ring. 12. Check a condition and passableness of the polnopotochny oil filter. Clean the filter and establish it on a place (with a new sealing ring). If passableness of the filter is broken, replace impellent oil.

Yokes with masloraspylitel

PERFORMANCE ORDER

1. Uncover heads of cylinders (see. The equipment and governing bodies in salon) also bring the piston of the first cylinder into situation VMT (see. Adjustment of seats). 2. Press a finger an intermediate yoke (see an accompanying illustration) – it should move freely from yokes of primary and secondary valves. Otherwise remove yokes for the purpose of check of a condition of components of assembly (see Removal, check of a condition and installation of camshafts and collectingки yokes). 3. After removal of yokes (see. Cowl unlocking) take from them synchronizing pistons (see an accompanying illustration). А) Yoke of the primary valve В) Yoke of the secondary valve С) Intermediate yoke D) Short piston Е) Long piston 4. Check all components (yokes and pistons) on existence of signs of wear, задиров and overheat traces. Defective details replace. Remove masloraspylitel from the inlet and final parties of a head of cylinders (see an accompanying illustration), clean them and establish into place. 5. Assembly is made as it should be, the return to a dismantle order. Before installation of sets of yokes on an axis bring together them and fasten rubber bandages (see. Cowl unlocking).

Assemblies of proof-readers of klapanny gaps

PERFORMANCE ORDER

1. In a head of cylinders four sets of proof-readers of klapanny gaps are established. 2. Remove individual assemblies of proof-readers (see. Cowl unlocking). 3. Fingers check freedom of moving of a plunzher of assembly of the proof-reader (see an accompanying illustration) – insignificant resistance should be felt, however at increase in loading the plunzher should be wrung out freely. In case of detection of defects replace assembly.