Before to carry out diagnostics of malfunctions, check up, that transfer and forward differential were in good repair, and there was no leak of air from air hoses and the actuator. Air leak is described in the given section in Section Service out of a workshop.
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Step
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Action
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Yes
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No
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1
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Include the ignition switch (but the engine is stopped) and check up malfunction of a bulb of the indicator.
The bulb burns?
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Pass to a step 2
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Somewhere there was a problem. Eliminate it
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2
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Check up the electroscheme of the switch of a full drive.
Include the switch of ignition and check up, that pressure between contacts С51-2-18 and С51-3-17 ("earth") for G16/J20 was the following:
* When the gear change lever in position N or 2Н: 10-14 Volt
* When the gear change lever in position 4 L or 4Н: 0-1 Volt
Results of check are satisfactory?
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Pass to a step 3
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Check up the switch of a full drive (the Mechanical transmission (type 1) see the Head), electroschemes “B/Or” and “B” the switch of a full drive. If everything is all right, replace with the serviceable electronic block of management and recheck
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3
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Check up a food.
Include the ignition switch.
Check up pressure between contacts С51-2-7 and С51-3-17 ("earth") for G16/J20. Results of check should be the following:
* When the gear change lever in position N or 2Н: 0-1 Volt
* When the gear change lever in position 4L or 4Н: 10-14 Volt
Results of check are satisfactory?
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Pass to a step 4
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Check up the scheme “R”. If everything is all right, replace with the serviceable electronic block of management and recheck
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4
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Check up the electroscheme of the air pump.
Check up correctness of connection with the air pump on all contacts.
Include the ignition switch.
Check up pressure between contacts С51-2-27 and С51-3-17 ("earth") for G16/J20. Results of check should be the following:
* When the gear change lever in position N or 2Н: 0-1 Volt
* When the gear change lever in position 4L or 4Н (more than 4 seconds after switching in 4L or 4Н): 10-14 Volt
Results of check are satisfactory?
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Pass to a step 5
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Check up the air pump as Service out of a workshop, and then the electroscheme “P” is described in Section. If everything is all right, replace with the serviceable electronic block of management and recheck
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5
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Check up the electroscheme of a bulb of the indicator of a full drive.
Include the ignition switch.
Check up pressure between contacts Е61-19 and С51-3-17 ("earth") for G16/J20. Results of check should be the following:
* When the gear change lever in position N or 2Н: 10-14 Volt
* When the gear change lever in position 4L or 4Н: 0-1 Volt
Results of check are satisfactory?
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Control system of a full drive in a good condition
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Check up the scheme “Or/B” (including a bulb of the indicator and the complex counter). If everything is all right, replace with the serviceable electronic block of management and recheck
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