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 printable version
Check and replacement of the gauge of absolute pressure in the pipeline (MAP)
On models since 1996, vol. The gauge of absolute pressure in the pipeline, complete with solenoid valve MAP is used to track the depth of depression in the inlet pipeline. Changing this respect barometric pressure changes is a result of the current engine load and rpm. RSM uses received signals from the MAP sensor for diagnostic purposes. When issuing the control module voltage at the solenoid valve IDA provides the latest generation of the vacuum signal, switching the MAP sensor to measure barometric pressure. In the absence of voltage across the valve MAP sensor reads depth underpressure in the piping, any change which is converted into a voltage signal, immediately transferred to the PCM. The amplitude of the signal generated by the sensor can be varied in the range of 0.5 V at completely closed throttle, to 5.0 V when fully open (low depth of dilution). There is also a certain dependence of the amplitude of the signal produced by the sensor from the barometric pressure, determined by the height position of the vehicle above the sea level. The sensor and solenoid valve installed IDA rear (transmission side) end face of the left (front) of the cylinder head. PCM are several types of sensor malfunctions, each of which is assigned an individual OBD fault code. CHECK MAP Sensor | 1. Disconnect the MAP sensor vacuum hose and connect to the last vacuum gauge. Run the engine at idle speed, - after about 5 seconds, the meter must register the vacuum, otherwise check the vacuum hose connecting the sensor with a solenoid valve for cracks or signs of impaired patency. If the hose is OK, make check the status of the solenoid valve. If you have a vacuum, proceed to check the status of the actual MAP sensor.
2. Disconnect the MAP sensor wiring. Connect a voltmeter to terminals (Red) and black (-) wire on the connector. With the ignition (the engine do not start) meter should give an indication in 5.0 V, otherwise, check the condition of the chain on a site between the connector and the PCM. If the wiring and contact connections are intact, the car should be driven away on a car repair shop to diagnose the state of the control unit and perform a corresponding regenerative repair.
3. Turn the ignition off and connect the sensor wiring. Connect the positive probe of the fan to the white wire terminal on the back of the connector (see chap. Onboard electric equipment), the negative probe to ground to ground. Turn on the ignition (the engine do not start) - must be a voltage in the range from 3.2 to 4.8 V.
4. Remove the vacuum hose from the sensor, and instead connect a hand vacuum pump. Create a vacuum gauge depth of about 203 mm. Hg. Art. The amplitude of the signal produced by the sensor voltage should go down to the value of 1.0 ÷ 1.4 V, otherwise replace the assembly. |
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Solenoid valve | 1. Disconnect the hose intake manifold vacuum source solenoid valve MAP. Connect the hose to a vacuum gauge. Run the engine at idle speed, - the meter should register depression, otherwise check the condition of the hose for cracks or signs of impaired patency. If the hose is in order, proceed directly to check the status of the valve.
2. Disconnect the solenoid valve wiring and IDA make sure there is battery voltage between the two terminals of the connector with the ignition on (do not run the distance). If the voltage is missing, contact the connection diagrams (see chap. Onboard electric equipment) and check the appropriate circuit for signs of continuity at the site between the assembly block of safety locks and valve connector (primarily, of course, check fuses).  | 3. If the battery voltage occurs, remove the solenoid valve and go to the diagnosis of his condition outside the vehicle. When equipped with a pair of fuse wire-jumper connect the valve to the 12 volt power source. At the time of energizing the valve should publish clearly audible click, accompanied by opening the air passage between the fittings A and B. If there is no voltage should open channel between the fittings A and C. Defective valve must be replaced.
A - For the MAP sensor
B - To intake duct
C - To power vacuum inlet pipeline |
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REPLACEMENT | 1. Disconnect the negative wire from the battery.  | If installed on the car stereo is equipped with a security code before to disconnect the battery make sure that have a correct combination for equipment introduction in action! |
2. Disconnect the wiring from the sensor and / or solenoid valve MAP.
3. Unscrew the sensor and / or solenoid valve MAP. Disconnect the vacuum hose (s) and remove the appropriate assembly.
4. Install in the reverse order. |
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