Note: For the location of the solenoid valves, see the figure "Location of emission control system components" in Chapter "Fuel injection system".
Checking the throttle control solenoid valves #1 and #2
1. Disconnect the cable from the negative terminal of the battery.
2. Remove the solenoid valve.
3. Check the operation of the solenoid valve.
a) Make sure that air does not flow from hole "A" to holes "C" and "B" and flows from hole "B" to hole "C".
b) Apply battery voltage to terminal "A" and ground to terminal "B" of the solenoid valve.
c) Make sure that air flows from hole "A" to hole "B" and does not flow to "C".
Otherwise, replace the solenoid valve.
Checking the throttle actuator
1. Disconnect the vacuum hoses from the throttle actuator.
2. Connect the vacuum pump to port "A" of the drive.
3. Create a vacuum and make sure the actuator rod moves.
Underpressure:
- less than 4 kPa - start of movement
- more than 25.3 kPa - completely displaced
(The article is based on website data www.MAZbook.ru)
4. Connect the vacuum pump to ports "A" and "B" of the drive.
5. Create a vacuum and make sure the actuator rod moves.
The piston rod should move fully when the vacuum is greater than 40 kPa.
If the above conditions are not met, replace the throttle valve.