Examination
Note. Performing the procedure described below may lead to the entry into the OBD memory of a malfunction, which will be highlighted by a control lamp "Check engine". After completing the check and the corresponding remedial repair, do not forget to clear the system memory (see Section On-Board Diagnostic System (OBD) - the principle of operation and fault codes).
MAP sensor
1. Disconnect the vacuum hose from the MAP sensor and connect a vacuum gauge to the latter. Start the engine at idle, after about 5 seconds the meter should register a vacuum, otherwise check the vacuum hose connecting the sensor to the solenoid valve for cracks and signs of obstruction. If the hose is in order, check the condition of the solenoid valve. If there is a vacuum, proceed to check the condition of the MAP sensor itself.
2. Disconnect the wiring from the MAP sensor. Connect a voltmeter to the red terminals () and black (-) connector wires. With the ignition on (do not start the engine) the meter should read 5.0 volts, otherwise check the circuit between the connector and the PCM. If the electrical wiring and contact connections are in order, the car should be driven to a service station to diagnose the condition of the control module and perform the appropriate repair.
3. Turn off the ignition and connect the wiring to the sensor. Connect the positive fan probe to the white wire terminal on the back of the connector (see chapter Onboard electrical equipment), ground the negative probe to ground. Turn on the ignition (do not start the engine), - voltage must be in the range from 3.2 to 4.8 V.
4. Disconnect the vacuum hose from the sensor and connect a hand vacuum pump instead. Create a vacuum on the sensor with a depth of about 203 mm. rt. Art. The amplitude of the signal voltage generated by the sensor should drop to 1.0 ÷ 1.4 V, otherwise replace the assembly.
Solenoid valve
1. Disconnect intake manifold vacuum source hose from MAP solenoid valve. Connect a vacuum gauge to the hose. Start the engine at idle - the meter should register a vacuum, otherwise check the condition of the hose for cracks and signs of obstruction. If the hose is in order, go directly to checking the condition of the valve.
2. Disconnect the electrical wiring from the MAP solenoid valve and check for battery voltage between the two connector terminals with the ignition on (don't run away). If there is no voltage, refer to the wiring diagrams (see chapter Onboard electrical equipment) and check the associated circuit for signs of an open in the area between the fuse mounting block and the valve connector (first of all, of course, you should check the condition of the fuses).
A - To the MAP sensor
B - To the intake duct
C - To the source of vacuum inlet pipeline
3. If battery voltage is present, remove the solenoid valve and proceed to diagnose its condition outside the vehicle. Using a pair of fused jumper wires, connect the valve to a 12-volt power source. At the time of applying voltage, the valve should make a distinct click, accompanied by the opening of the air channel between fittings A and B. In the absence of voltage, the channel between fittings A and C should open. A defective valve must be replaced.
Replacement
1. Disconnect the negative cable from the battery.
Attention! If the stereo system installed in the car is equipped with a security code, before disconnecting the battery, make sure that you have the correct combination to activate the equipment!
2. Disconnect wiring from sensor and/or MAP solenoid valve.
3. Turn out screws of fastening of the gauge and/or electromagnetic valve МАР. Disconnect the vacuum hose (And) and remove the appropriate assembly.
4. Installation is carried out in the reverse order.