The idle speed of the crankshaft is determined by the rotary idle speed regulator, which maintains it within 720-780 rpm by the controller commands and is not subject to adjustment.
To check the content of carbon monoxide (SO) in the exhaust gases, connect a gas analyzer according to the instructions, start the engine at idle and check the CO content, which should not exceed 1%.
In case of deviation from the norm, use a small screwdriver to remove the plug of the adjusting screw of the CO correction potentiometer located on the side of the air flow meter (see drawing) and, turning the screw, achieve the required CO content.
After adjustment, install a new cap for the adjustment screw of the CO correction potentiometer.
Throttle opening test
The throttle valve opening is set at the factory and cannot be adjusted. Checking and adjusting the throttle position sensor.
Disconnect the connector from the throttle position sensor.
Connect an ohmmeter to the leads «2» And «18» sensor pads and measure the resistance with an ohmmeter, which should be 0 ohms.
Connect an ohmmeter to the leads «3» And «18» sensor pads and measure the resistance, which should be equal to infinity.
If the ohmmeter reading does not match the data, loosen both screws securing the sensor housing and turn it counterclockwise until resistance is felt. In this position, tighten the screws securing the sensor housing, and then check its operation by slowly opening the throttle. At the same time, when the throttle begins to open, a click should be heard from the operation of the switch.
Checking the air flow meter
Disconnect the wire from the negative battery terminal.
Disconnect the air flow meter connector.
Rejecting the pressure damper of the air flow meter, check the smoothness of its movement throughout the course. If necessary, thoroughly clean internal surfaces of tar deposits with a suitable solvent.
Consistently connecting an ohmmeter to pairs of leads «2» And «4», «4» And «3», «4» And «1» meter pads (see picture), check that its readings correspond to the required resistance values (see subsection «Design and specifications»).
Fuel pressure test
Disconnect the fuel supply hose from the fuel line and connect the pressure gauge hoses to the hose opening and the branch pipe of the line.
Start the engine at idle.
Disconnect the vacuum hose from the fuel pressure regulator and check the fuel supply pressure on the pressure gauge, which should be in the range of 2.3-2.7 kg / cm2. Connect a vacuum hose to the fuel pressure regulator and make sure that the pressure on the pressure gauge has decreased by 0.3-0.5 kg / cm2.
Stop the engine and monitor the pressure on the pressure gauge. When the pressure drops, check the operation of the fuel pump check valve by pinching the fuel supply hose between the fuel pump and the fuel line. Check the tightness of the pressure regulator check valve by pinching the fuel drain hose below the regulator. If the check valves are OK, check the tightness of the injection nozzles as follows.
Checking the performance of the fuel pump
Disconnect the connector of the dual injection and fuel pump control relay and short-circuit the leads through the fuse «30» And «87B» pads (see picture).
Disconnect the fuel supply hose from the distribution line and lower the end of the hose into a graduated vessel.
Turning on the ignition, start the fuel pump for 60 seconds and measure the amount of fuel that has spilled out of the hose, which should be equal to 1 liter.
Checking the coolant temperature sensor
Disconnect the block from the sensor, bleed the residual pressure from the cooling system and unscrew the sensor.
Place the sensor in a tank with water or coolant. which can be heated. Connect an ohmmeter to the sensor leads (see picture). Turn on water heating and measure the resistance of the sensor, which must correspond to the values \u200b\u200bspecified in subsection «Design and specifications».
Note. The sensor can be tested on the vehicle, provided that the specified test conditions are met.
Checking the intake air temperature sensor
The air temperature sensor is built into the air mass meter and cannot be replaced separately.
To check the electrical resistance of the sensor, connect an ohmmeter to the terminals «4» And «5» air flow meter pads and check the resistance of the sensor, which must correspond to the values \u200b\u200bgiven in subsection «Design and specifications».
Checking the rotary idle control
Disconnect the block from the rotary idle speed control» connect an ohmmeter to the terminals of the regulator and check the resistance, which at a temperature of 20°C should be about 8 ohms.
Exhaust oxygen concentration sensor test
In the event of a malfunction of the oxygen concentration sensor installed on vehicles with an exhaust gas converter, the digital engine control system malfunction indicator lamp lights up on the instrument panel.
Note. With an oxygen concentration sensor, it should be removed from the exhaust manifold only after the engine has warmed up to normal operating temperature.
Checking the tightness and cone of spray of fuel injection nozzles
Shine from the engine fuel line assembly with injectors and fuel pressure regulator.
Disconnect the blocks from the injectors without disconnecting the fuel lines from them.
Support the fuel line with injection nozzles and pressure regulator and with fuel supply and drain hoses connected to it above a suitable container.
Disconnect the injection and fuel pump control relay connector, operate the fuel pump by shorting the leads «30» (red wire) And «87B» (red-black wire) pads through a 10 A fuse, and check for fuel leakage through the injectors, which should not be more than 1 drop per minute. Replace leaky injectors.
Check the correctness of the fuel spray cone of the injector, which must correspond to that shown in the figure, by connecting a 12 V DC source in series to each injector.
Check the resistance of the injector winding by connecting an ohmmeter in series to their terminals, the readings of which should be in the range of 15-17 ohms.
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